California Fruit and Vegetable

Category: Non-Video

  • Fusarium Wilt of Watermelon 2021

    Last year we had a lot of watermelon fields infected with Fusarium from Winterhaven to Yuma, Wellton, and Mohawk Valley. Rain, and overwatering of fields when plants set fruits might have contributed to the disease development.

    Fusarium wilt of watermelon, caused by Fusarium oxysporum f. sp. niveum, is one of the oldest described Fusarium wilt diseases and the most economically important disease of watermelon worldwide. It occurs on every continent except Antarctica and new races of the pathogen continue to impact production in many areas around the world. Long-term survival of the pathogen in the soil and the evolution of new races make management of Fusarium wilt difficult.

    Symptoms of Fusarium can sometimes be confused with water deficiency, even though there is plenty of water in the field. In Yuma valley we have seen fusarium problem in some overwatered fields.

    Initial symptoms often include a dull, gray green appearance of leaves that precedes a loss of turgor pressure and wilting.  Wilting is followed by a yellowing of the leaves and finally necrosis.  The wilting generally starts with the older leaves and progresses to the younger foliage. Under conditions of high inoculum density or a very susceptible host, the entire plant may wilt and die within a short time.  Affected plants that do not die are often stunted and have considerably reduced yields.  Under high inoculum pressure, seedlings may damp off as they emerge from the soil.

    Initial infection of seedlings usually occurs from chlamydospores (resting structure) that have overwintered in the soil.  Chlamydospores germinate and produce infection hyphae that penetrate the root cortex, often where the lateral roots emerge.  Infection may be enhanced by wounds or damage to the roots.  The fungus colonizes the root cortex and soon invades the xylem tissue, where it produces more mycelia and microconidia.  Consequently, the fungus becomes systemic and often can be isolated from tissue well away from the roots. The vascular damage we see in the roots is the defense mechanism of the plant to impede the movement of pathogen.

    Disease management include planting clean seeds/transplants, use of resistant cultivars, crop rotation, soil fumigation, soil solarization, grafting, biological control. An integrated approach utilizing two or more methods is required for successful disease management. — By Bindu Poudel, University of Arizona Extension

  • Summer Sanitation is Important as Ever

    It is never too early to start planning for next produce season, particularly with the threat of Impatiens Necrotic Sprot Virus (INSV) looming. As many of you know, INSV was found in several Yuma locations this spring, particularly in the Tacna area. Overall, INSV incidence was very low (~1% incidence), but there were a few fields where incidence was estimates at > 25% (see Chart 1 below).

    With desert lettuce production now finished, the question remains; will INSV in these infested areas survive the summer in the absence of lettuce. Of course, this depends on the availability of host plants in the cropping landscape to serve as reservoirs for INSV in the next 4 months, as well as the abundance of western flower thrips on these hosts. A team of applied scientists at the UA Yuma Ag Center –Bindu Poudel, Stephanie Slinski, Barry Tickes, Marco Pena and myself (with the assistance of Daniel Hasegawa, USDA-Salinas) – are currently trying to determine this.  First, we know that many of the common weeds currently found in drainages, field borders, and ditch banks serve as reproductive hosts for western flower thrips.  What this means is that thrips are capable of colonizing these weed hosts. Immigrating adults can transmit viruses and larvae can acquire viruses that can be transmitted after they emerge as adults. Recent areawide monitoring of crops and weeds in Tacna and Yuma Valley showed thrips adults and larvae were abundant on nettle leaf goosefoot and cheeseweed (see Chart 2 below), and more importantly, tissue samples recently collected from weeds near previously infected lettuce fields in Tacna tested positive for INSV in nettleleaf goosefoot, cheeseweed, and purslane.   It appears that these weeds could provide a green bridge for the virus and the vector from now till September. The threat of INSV surviving within our desert cropping system in the absence of lettuce this summer is real.

    So, weed management this summer is going to be very important if we hope to eliminate the local presence and spread of INSV.  Growers should be extremely vigilant in keeping ditch banks and low-lying drainages adjacent to fields free of weeds. When upcoming wheat harvests are completed, all weeds along field edges need to be thoroughly disked under along with the stubble.  Even a few remaining goosefoot or purslane plants on a field edge can potentially harbor INSV and a significant number of thrips vectors. Similarly, periodic disking of alfalfa borders and field edges should help minimize weed regrowth.  Same goes for cotton and Sudan grass fields. When spring melons are harvested, growers should promptly disk under plant residue.  Any PCA watching melons this spring can attest to the attractiveness of melon flowers to thrips. Finally, as growers start to flat water fields in preparation for fall lettuce planting, it will be as important as ever to promptly control weeds emerging in those fallow blocks. Remember, recent weed sampling showed purslane tested positive for INSV, and a ten-acre field infested with purslane can potentially generate a lot of thrips. So can volunteer melons.  Thus, summer sanitation is as important as ever. Bottom line:  anything growers can do to reduce weed abundance in and around their fields can only help. For more information on this crop sanitation, please visit Weed Interference with Insect Management in Desert Crops.  The other critical question we are working on is whether our summer crops (alfalfa, cotton, melons) serve as hosts and reservoirs for INSV. We do not know yet, but our team is working on it.  We’ll let you know when we know. — John Palumbo, University of Arizona Extension

  • Ag Order 4.0 Finalized: Implications for Nitrogen Management of Central Coast Vegetables

    On April 15th, the Central Coast Regional Water Quality Control Board (CCRWQCB) finalized and approved Ag Order 4.0. The new rulings affect several aspects of agricultural production such as buffer areas and discharge of pesticides to water ways. In this article we will focus on the impacts of Ag Order 4.0 on the use of nitrogen (N) fertilizers.

    New targets and limits on the use of N fertilizer are calculated using the A minus R metric. In this scenario, “A” is N applied to the crop in the form of fertilizer (Afertilizer), N in irrigation water (Airrigation), N supplied by compost (Acompost) and N mineralized from organic fertilizer (Aorganic fertilizer). “R” is N removed from the field by the crop (Rharvest), scavenged during the winter fallow by cover crops or immobilized by high-carbon compost (Rscavenge), N removed by denitrification bioreactors (Rtreated), N sequestered in woody plant biomass (Rsequestered), or other unspecified forms of N removal from fields (Rother). Although AgOrder 4.0 outlines 3 pathways to compliance, pathway 1 is most likely the one that most ranches would use unless the wells have very high nitrate-N concentrations (> 40 ppm N).  A – R is not to exceed the targets or limits shown in Table 1 for pathway 1 compliance. The A-R is calculated over the growing season on a land acre basis. If two or more crops are grown on the same physical acre, each crop contributes to the value for the year. Below is a discussion of each component of the A-R metric.

    The “A” side of the equation:

    Afertilizer is the amount of N fertilizer added to grow the crop. The actual units of N in lbs/A are used in this calculation.

    Airrigation is the amount of N contained in the irrigation water that is taken up by the crop. For most vegetable and berry crops grown on the central coast the volume of water that must be accounted for in this calculation is equivalent to the volume used by the crop for evapotranspiration (ET).  For crops where less water is applied than ET, the volume of applied water can be used in the calculation.  To calculate Airrigation use the equation:

    Airrigation = water volume (inches) x nitrate-N concentration of water (ppm N) x 0.227

    The factor 0.227 converts the units inches x ppm N to lbs of N/acre.

    For example, if a lettuce crop uses 7.3 inches for ET, and is irrigated with water that has a 37 ppm N concentration, the Airrigation would be:

     7.3 inches x 37 ppm N x 0.227 = 61 lbs N/acre

    Acompost is the amount of N provided by compost. Given that the amount of N that is mineralized by the compost depends on the carbon to nitrogen (C:N) ratio not all the N in the compost becomes available. This fact is recognized in the Ag Order as follows:

    For compost with a C:N ratio of <11, the amount of N in the compost is multiplied by 0.10, and for composts with a C:N ratio of >11 the amount of N in the compost is multiplied by 0.05. Only this amount of N is added to the A side of the equation. These discount factors were an important change made by the Regional Board staff to reflect the actual quantity of N provided by compost and to avoid a disincentive to the use of composts, a key soil health practice.

    Aorganic fertilizer is the amount of N that is mineralized during the cropping system. The amount of N mineralized depends upon the C:N ratio of the material and the CCRWQCB is using the regression curve in a recent paper published by Lazicki et al (2020) to determine the amount of N mineralized. For instance, a material like 4-4-2 has a C:N ratio of 7.3 (29% C/4% N) and has a discount factor of 0.39 (Table MRP-3 in Attachment B). This means that if 100 units of N are applied as 4-4-2, the amount mineralized from this material and that is attributed to the A side of the equation is 39 lbs/A (100 lbs x 0.39). This discount factor acknowledges the fact that not all N in organic fertilizer mineralizes during the cropping season and was an important correction made to Ag Order 4.0.

     The “R” side of the equation:

    Rharvest is the amount of N that is removed from the field in the harvested product. The amount of N removed in the harvested product is calculated by a removal coefficient composed of the percent moisture multiplied by the percent N of the crop. This coefficient is then multiplied by the net pounds of product harvested from a field to determine lbs N/A removed. We have been working on a project developing N removal coefficients for a number of vegetable commodities. Table 2 shows data for full term romaine lettuce. Note that percent solids and nitrogen values observed in our evaluations vary significantly and that the mean value has a notable degree of variability which affects the estimate of N removed by the crop. Regardless of the variability, the important point to recognize is that the removed N is modest in relation to the amount of N applied. Figure 1 shows total fertilizer N to lettuce for a large number of vegetable operations in our area. It becomes evident that growers face some major challenges in complying with the application limits as the limits ratchet down over the next several years.

    Rscavenge is the amount of N that is captured by by cover crops or immobilized by high-carbon compost during the winter fallow period. The CCRWQCB agreed to credit non-legume winter cover crops with 97% of their N content that meet the following criteria: 1) are grown for ≥ 90 days during the winter fallow period, 2) accumulate more than 4,500 lbs/acre of dry biomass and 3) have a C:N ratio of ≥ 20 when incorporated into the ground. N scavenging credits granted for cover crops are helpful, but do not remove any of the current logistical barriers to using of cover crops in intensive vegetable systems. However, given that non-legume cover crops routinely contain 100 to 150+ lbs N/acre, as N application limits ratchet down, cover crop use may be incentivized to some degree.

    High-carbon composts were also included in the Rscavenge category. This practice is still being researched to fully understand how  much N can be immobilized.  Growers already use compost (typical C:N ratio of 10-12) but could substitute high-carbon compost (C:N ratio of >30) which can quickly facilitate its use. Currently, high-carbon compost has been granted a credit of 30 lbs N/acre in Ag Order 4.0. However, once the research on this practice is completed, this practice may be granted greater credits as warranted on the R side of the equation.

    Rtreat is the quantity of N removed from tile drainage  and irrigation runoff by denitrification bioreactors or constructed wetlands. This practice can be implemented in the northern part of Monterey County where high nitrate tile drain water impacts the surrounding sloughs and creeks.  The bioreactors vary in size and sophistication, from sunken beds filled with wood chips to highly engineered portable treatment systems.

    Rsequestered is the quantity of N that is captured in the woody plant tissue of perennial crops. This form of N removal is relevant to vineyards and orchards in our area and does not impact the vegetable industry.

    Rother is the quantity of N removed from the field in other, unspecified ways. One form of N removal not addressed in Ag Order 4.0 is the gaseous loss of N by denitrification from soil. This is a topic that needs further research. Two studies done on the Central Coast showed that in sandy soils with drip irrigation, there is little nitrous oxide or dinitrogen loss (2-4 lbs N/acre/crop). However, an earlier study of celery and lettuce production fields in the 1980s showed that on heavier soil with furrow irrigation gaseous N losses ranged from 18 to 37 lbs N/acre. Further research is needed to understand denitrification rates more fully in coastal vegetable production.

    What options does the industry have moving forward?

    Basically, a timer has been started by Ag Order 4.0. The first dates are targets of 500 lbs N/acre/year 2 years from now and 400 lbs N/acre/year in 2025 (four years). Starting in 2027 the targets become limits ratcheting down to 300 lbs N/acre/year. In scenarios that we and others have run, the 300 lbs N/acre/year limit will become very challenging for growers to comply with in typical double cropped production. There are basically three key practices that will provide the most improvements in N use efficiency: 1) measuring residual soil nitrate and adjusting fertilizer applications accordingly, 2) accounting for the nitrate in irrigation water as part of the N budget, and 3) improving irrigation efficiency to help maintain residual soil nitrate in the active rootzone of crops. A concerted focus on these three practices will require a commitment from the decision makers at each farming operation. Farming operations have differed in their approach to the pending water quality regulations. Some have taken a proactive approach and are farther along on the learning curve. It is important to make attempts to begin implementing these practices and see what is possible for your operation given the crop mix, soil types, and nitrate levels in the irrigation water. The good news is that there is still time. To begin implementing these practices, it is important to start small to gain the needed knowledge base in efficient N and water management practices. Working with knowledgeable people will be essential.

     Other options that can help fine tune fertilizer applications and reduce the risk of cutting fertilizer rates are various nitrogen technologies such as nitrification inhibitors and controlled release fertilizers. In studies that we have done, there is clearly a benefit to the use of some of these materials, but again, there is a learning curve to obtaining the benefits that they can provide. Nitrapyrin (a nitrification inhibitor commonly used in the corn belt) was registered on lettuce and brassicas in 2019 and has not been widely used yet by the industry, but it along with other materials, deserves greater evaluation.

    In summary, the finalization of Ag Order 4.0 will have a significant impact on how vegetables are grown on the Central Coast in the coming years. There is a window of opportunity to begin to experiment on how to address limits that will be applied to the use of N fertilizers. Now is the time to make the decisions needed to address this new reality.  Please do not hesitate to reach out to us for help or advice. — By Richard Smith & Michael Cahn, UC Cooperative Extension

  • ARS Citrus Rootstocks: A Success Story

    ARS Citrus Rootstocks: A Success Story

    Remember that old commercial that declared, “A day without orange juice is like a day without sunshine”? Thanks to the Agricultural Research Service (ARS), consumers can enjoy “citrus sunshine” whenever they like. Begun by USDA more than a century ago, the citrus research program has helped to ensure a bounty of not only oranges, but also grapefruits, mandarins, lemons, and more.

    But that bounty was severely threatened in 2005 with the appearance of a new and destructive disease. Citrus greening, or huanglongbing (HLB), has caused Florida citrus production to plummet around 70 percent in the 15 years since the disease hit U.S. citrus groves. HLB, which causes low yields, yellowed leaves, and bitter-tasting fruit, is caused by a bacterium, Candidatus Liberibacter asiaticus. So far, there is no cure.

    Like other crops, citrus crops are susceptible to a variety of diseases and pests. One reliable way to fend off those threats is to graft the fruit-producing part of a tree (the scion) to the lower trunk and root system (the rootstock) of a different tree that has been bred to resist the disease or pest. Rootstocks are also used to obtain specific tree sizes, yields, and fruit quality, among other goals.

    A 6-year-old Owari Satsuma Mandarin tree on US-942 rootstock developed by ARS. In this trial, US-942 was the highest yielding rootstock, averaging more than 300 pounds of fruit per tree (Photo by Jake Price, University of Georgia).

    With ARS’s long history of helping growers keep their groves healthy and productive, the agency had the expertise required when HLB appeared. To quickly address the problem, the ARS citrus breeding project was refocused in 2005 partly to develop new, HLB-tolerant, highly productive citrus rootstocks.

    Led by Kim Bowman, a plant geneticist in the ARS Subtropical Insects and Horticulture Research Unit in Fort Pierce, FL, the team released 12 new HLB-tolerant citrus rootstocks between 2007 and 2018. Before and after the releases, Bowman conducted dozens of field trials to evaluate and validate the rootstocks’ performance, providing the scientific data needed to demonstrate their potential and gain industry acceptance. These rootstocks, all with the prefix “US,” have since become a key component in the survival of the Florida citrus industry.

    ARS plant geneticist Kim Bowman in front of 5-year-old Valencia orange trees on HLB-tolerant rootstocks he and his colleagues developed (Photo by Diane Helseth).

    Not surprisingly, demand for the rootstocks was extremely high, and growers also needed assurances that they’d be getting the real deal. Bowman arranged for the plant material to be certified disease-free by the Florida Department of Agriculture, paving the way for the rootstocks to be commercially propagated on a large scale.

    Bowman and his colleagues have also done a great deal of research on rootstock propagation. Even though most common citrus rootstocks can be grown uniformly from seeds, it takes several years for a young tree to produce a lot of seeds, and the seeds of many new rootstocks don’t grow into true-to-type plants. The scientists have shown that using plant cuttings or tissue culture is an acceptable alternative to starting new rootstock trees from seed, and it’s a much faster way to create hundreds of thousands of plants.

    The use of these alternative methods has dramatically increased propagation for some of the new rootstocks, so that nurseries are not limited by seed supply.

    From 2018 to 2020, the HLB-tolerant “US” rootstocks were used to produce nearly 3 million new citrus trees, or about 37 percent of all trees propagated in Florida. These rootstocks have also proven effective in areas affected by other diseases besides HLB. The rootstock “US-942” demonstrated the most consistent outstanding performance in field plantings and was the most popular rootstock in Florida from 2018 to 2020, with about 1.8 million trees propagated during that 2-year period, or about 22 percent of all propagations.

    For more information, visit Citrus Rootstocks.—By Sue Kendall, USDA-ARS Office of Communications.

  • Breeding Better Blueberries with USDA

    Breeding Better Blueberries with USDA

    Drs. Jim Polashock (JP) and Jeannie Rowland (JR) are researchers with the Genetic Improvement for Fruits & Vegetables Laboratory located in Beltsville, MD. Their work involves the improvement of blueberries through the identification and evaluation of genetic markers linked to traits like fruit color, cold hardiness, and disease resistance. In an “Under the Microscope” (UM) interview with the USDA-ARS, the following was shared:

    UM – Blueberries are often hailed as ‘superfruits.’ What makes these berries so healthy?

    JR – The same compounds that give blueberries their hue are also potent antioxidants. Anthocyanins have been linked to many health benefits, from improving night vision and preventing macular degeneration to ameliorating inflammation associated with chronic diseases like cancer and heart disease.

    JP – In addition to the anthocyanins, blueberries are relatively low in calories and packed with other nutrients including vitamin C, potassium, and compounds called flavonoids. The flavonoids also have been linked to anti-inflammatory activity.

    Side by side comparison of two blueberry lines; ‘Bluecrop’ (left) has light blue-colored fruit with a waxy coating, while ‘Nocturne’ has black-colored fruit without a waxy coating.

    UM – Which blueberry traits are you and your team looking to improve?

    JR – We focus on improving traits that are important to the blueberry industry. For example, we hope to discover the genes that are responsible for climatic adaptation (like cold hardiness and chilling requirement), which help determine the geographical range where plants can be grown. We’re also studying several fruit quality traits, such as firmness and scar size. The scar is the opening on the back of the berry that is left when the stem detaches. This can be an entry point for diseases, so it is important that the opening is small.

    Fruit color is also an important trait that we are researching.  Berries can range from black to the more desirable light blue color. The light blue color is the result of a waxy coating on the fruit that can help prevent disease and desiccation (the drying out of the fruit).

    Blueberry plants of a new ARS-developed cultivar ‘Talisman.’

    JP – Another one of our goals is to improve natural disease resistance in blueberries. We are working on uncovering the genes associated with disease resistance. Once discovered, we can bring resistance genes from various blueberry plants into superior plants through traditional breeding. Blueberries with improved resistance reduce production costs and help protect the environment and consumers. We are also working on varieties suitable for machine harvesting, which requires the fruit to be firm and ripen around the same time. Machine harvesting increases sustainability by reducing costs.

    UM – The U.S. blueberry crop alone is estimated to be worth more than $900 million and the global blueberry market is swiftly expanding.  What kinds of threats do blueberry growers and producers currently face?

    JP – To be competitive, growers must produce a quality product while keeping costs down. This involves research across several different disciplines including breeders, horticulturalists, pathologists, and others that all contribute to various aspects of developing improved varieties, disease control and production practices.

    JR: In some years, severe low temperatures in winter can cause damage to flower buds. Also, frosts in late winter and early spring can cause major damage to opening flowers in some years. This kind of damage to flower buds and opening flowers decreases fruit yield.

    UM – What common pathogens or fungi should home gardeners be aware of? 

    JP – Since blueberries are native to North America, they are well-adapted to grow here and have few important disease problems. However, the most common disease home gardeners are likely to see is fruit rot — called anthracnose — that is caused by a fungus. While not harmful to consume, it can make the berries soft and unappealing.  Another common fungus-caused threat to blueberries is a disease called mummy berry, which results in leaf infections and small dried fruit called ‘mummies.’

    Blueberries can also acquire viral infections that reduce plant vigor and yield.  Unfortunately, virus-infected blueberries cannot be cured and affected bushes must be removed to contain the virus. In addition, most of these viruses are transmitted by sucking insects, so the best way to prevent blueberry viruses from spreading is through insect control.

    UM – How can growers protect their blueberries?

    JP – Home gardeners should check with their local gardening supply store for recommendations on how to control the diseases and insects. Birds eating the berries as they ripen is probably more of issue for home gardeners. Bird netting can be purchased at gardening supply stores to help protect the crop.

    UM – How can consumers extend the shelf life of blueberries?

    JP – Fresh blueberries generally disappear pretty quickly but keeping them in the refrigerator will help extend shelf life. They can also be frozen for longer term storage.

    UM – Do blueberries lose some of their nutritional value if frozen or mixed with other fruits?

    JP – Blueberries maintain all of their nutritional quality after being frozen. In fact, freezing can help preserve some nutrients. The berries will be soft when they defrost but will still taste great.

    UM – Can your research in blueberry improvement be applied to other fruits, such as other members of the genus Vaccinium like cranberries? 

    JP – Blueberries and cranberries are actually closely related North American fruit crops.  Although they appear to be quite different, as blueberries grow on bushes with soft sweet fruit while cranberries grow on low-growing vines and bear firm tart fruit, they are actually genetically quite similar.

    JR – We have been working on team projects to sequence the blueberry and cranberry genomes.  Due to their similarities, we can compare traits and markers of one species to those in other related species and transfer information between the two.

  • Research Helps Develop High-Yielding, Drought Tolerant Lines of Chickpea

    Chickpeas are a very important crop and food in India. They are used almost every day in meals and snacks. India is the largest producer, consumer, and importer of chickpeas. And with good reason — they are high in protein, fiber, and vitamins and minerals.

    While India grows about 12 million tons of chickpeas each year, the national yield of the crop has not increased much over time. However, the need for more chickpeas to feed the increasing population continues to grow.

    This is why a group of researchers across several research institutions in India are working to develop high yielding chickpea varieties. The team recently reported their results in The Plant Genome.

    “High yielding varieties will help small-holder farmers by delivering more produce with an option to increase income,” says Rajeev Varshney, member of the Crop Science Society of America. “It is important to develop better varieties that are tolerant to drought and are able to meet the demand.”

    Rajeev Varshney, a research program director at the International Crops Research Institute for the Semi-Arid Tropics, examines a chickpea crop (Credit: ICRISAT)

    Over time, chickpea production has moved from northern India to the central and southern parts of the country, where there is less water. This is in addition to climate change impacting global agriculture.

    Varshney and his collaborators set out to breed new varieties of chickpeas with drought tolerance and higher yields. They used genetic techniques to breed several traits for drought tolerance. They focused on popular chickpea varieties already grown by farmers.

    The team used a common method called introgression, where a popular variety is crossed with a variety with the desired traits. Following a series of evaluations and repeated crossings, the breeders arrived at an improved chickpea variety with the desired traits.

    “However, this conventional process is not very precise, and in this procedure, breeders need to screen a large number of plants in field conditions,” Varshney explains. “For example, if there is a lot of rain in that season, breeders cannot select the line for drought tolerance. It ruins the whole experiment.”

    To combat this, the researchers used a technique called marker-assisted backcrossing. It uses laboratory techniques to detect a genetic marker. Genetic markers are DNA segments associated with certain plant characteristics or agronomic traits desired by farmers.

    By being able to detect certain plant characteristics in the lab using genetic markers, there is no need to do lots of testing every year in the field. It makes the breeding process precise, fast, and cost-effective.

    The work helped incorporate drought tolerance into three popular varieties of chickpeas. Overall, researchers developed six lines of chickpea with higher yields under drought conditions. One line, Pusa Chickpea 10216, has been released for use by Indian farmers.

    “We worked with already released elite varieties that are preferred by farmers,” Varshney says. “By improving these, it’s more likely they will be adopted by farmers in a faster manner.”

    “Here we have demonstrated successful use of using genetic markers to develop drought tolerant chickpea varieties,” Varshney says. “We would like to see this kind of breeding being deployed by our national partners at a large scale in India, Ethiopia, Kenya, Tanzania, and elsewhere.”

    This research shows the public benefits of this kind of genetic research. Maintaining strong public support and funding for the research pipeline allows such work to take place.

    “The work shows how genomics research can be used to develop better high-yielding drought tolerant varieties,” Varshney says.

    Rajeev Varshney is a research program director at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) and Adjunct Professor with Murdoch University (Australia). Support for this research was provided by the Government of India through its Department of Biotechnology in the Ministry of Science and Technology, Department of Agriculture, Cooperation & Farmers Welfare in the Ministry of Agriculture & Farmers Welfare, and the Bill & Melinda Gates Foundation.

    Flowers are incredibly striking when in full bloom (Photo by L. Vidyasagar)

    American Society of Agronomy, Soil Science Society of America, Crop Science Society of America: Collectively, these Societies represent more than 12,000 individual members around the world. Members are researchers and professionals in the areas of growing our world’s food supply while protecting our environment. Together we work toward solutions to advance scientific knowledge in the areas of agronomy, crop science, and soil science.

    Twitter: @ASA_CSSA_SSSA & @SSSA_soils | Facebook: ASA, CSSA & SSSA | Instagram: @sustainablefoodsupply & @iheartsoil

  • California Strawberry Commission Connects Farmers and Consumers with Summer Campaign

    The California Strawberry Commission has launched a campaign to connect the heart of strawberries with the heart of people. Throughout peak strawberry season 2021, consumers will have access to real farmer and farmworker stories through a #StoryBehindtheBerry webisode series shared across Facebook, Instagram and www.californiastrawberries.com.

    To inspire people to eat more healthy strawberries, consumers can enter the #CAStrawberryChallenge by recreating a California Strawberries recipe for a chance to win one of 15, $200 gift cards from May through July.

    To help consumers stay on top of the latest nutrition trends and the many health benefits of California strawberries, registered dietitian Whitney English shares her expertise on the summer-long series called Whit’s Tips featured on social media and the California Strawberries’ consumer website.

    A series of “Strawberry Snackdowns” will feature registered dietitians competing live on Instagram for prizes for creating the most creative healthy strawberry snacks. By simply voting for a winner in the fun competitions, participants are automatically entered to win $50 visa gift cards. The next #StrawberrySnackdown, hosted by influencer Michelle Smith from The Whole Smiths, will take place Thursday, May 13th at 11:00 a.m. PDT.

    Additionally, timely nutrition information, summer recipe videos, cooking demos, giveaways, and more will be shared daily across Facebook, Instagram, Pinterest, YouTube and www.californiastrawberries.com.

    About California Strawberries

    The California Strawberry Commission represents more than 400 strawberry farmers, shippers and processors, proudly working together to advance strawberry farming for the future of our land and people. Commission programs create opportunities for success through groundbreaking programs focused on workforce training, strawberry production research, and nutrition research. Through science-based information and education, we deliver the good news about sustainable farming practices that benefit the health of people, farms, and communities.

  • Transitioning to High-Density, Mechanically Harvested Table Olive Acreage

    Transitioning to High-Density, Mechanically Harvested Table Olive Acreage

    California’s table olive industry is over 100-year-old, and it is currently undergoing transformation to mechanically harvestable acreage similar to almond, walnut, prune, pistachio, and other tree crops.

    The modern acreage configuration for table olives provides multiple benefits including increased tree count, efficient irrigation methods, mechanically adapted spacings, and a uniform tree structure. While traditional olive acreage is typically planted 60 to 80 trees per acre and hand-harvested, the modern acreage system is optimized with 200 to 250 trees per acre and mechanical harvesting using shaker technology. This approach doubles the yield per acre and reduces harvesting costs to roughly one-third of hand harvesting, which drives significantly improved grower economics.

    Olive trees are also drought-tolerant and annually use less water than almonds or walnuts – a critical attribute given California’s constant drought concerns, rising water costs, and tightening water supply.  The trees enjoy peak productivity for decades and perform well on marginal soil, which helps minimize capital investment. Another outstanding attribute of the California olive industry is virtually all products are marketed and sold within the United States with zero reliance on export markets.

    Dan Flynn

    These many attributes are why modern olive acreage has been coined “California’s crop of the future” by no less of an authority than the UC Davis Olive Center.  Join industry leaders to discuss how California’s table olive industry is transforming to a state-of-the-art, high-density, mechanically harvested tree crop and get more information on what it takes to make the transition.

    Dennis Burreson

    The webinar is scheduled for Wednesday, June 23, from 9 a.m. – 10:30 a.m.  Hear from Dan Flynn, the founding executive director, UC Davis Olive Center, and Dennis Burreson, Vice President of Field Operations and Industry Affairs, Musco Family Olive Co. Register for the webinar HERE.

  • Stone Fruit Season Kicks Off With Early Season Organic Cherries and Apricots

    Stone Fruit Season Kicks Off With Early Season Organic Cherries and Apricots

    Fruit World, a family-owned, flavor-focused grower-shipper of organic and conventional fruit, is now shipping their organic cherries and will begin packing and shipping organic apricots the first week of May. “What a difference one year makes,” said Bianca Kaprielian, Fruit World co-founder and CEO. “2020 was a bumpy stone fruit season in California, but this year we had enough chill hours and favorable weather, and the trees are full of great looking fruit.”

    Unaffected by the late April rains, Fruit World’s Coral, Lynn and Tioga cherries are at peak flavor. Packed at Podesta Packing in Linden, CA, a new, state-of-the-art optical sorter ensures that only the best of the best cherries make it into the retail pack. “The fruit looks spectacular. We are really happy with this year’s crop, and it looks great in our fun and bright packaging,” said Richter. Fruit World’s organic cherry season continues through the end of May.

    “I’ve never seen the trees so heavy with apricots,” said Fruit World sales director, Cindy Richter. “It was a great set. The color and sugars are still developing, a week or so behind schedule due to the weather cooling off a bit, but as soon as we start shipping we’ll have promotable volumes through June and maybe into July.” Fruit World grows organic apricots in Reedley, CA. Continuing a long and fruitful partnership, Fruit World is also marketing Blossom Hill apricots from their ranches in Patterson, CA. In addition to the standard pack styles, this year they are excited to offer a new sustainable cardboard clamshell.

    When it comes to peaches and nectarines, Fruit World is the exclusive marketer of the world-renowned organic Masumoto Family Farm fruit. “We appreciate growers who share our values and vision. That’s why we’re super excited about our partnership with Masumoto Family Farm, bringing their legendary peaches and nectarines to market,” Kaprielian effused. “And we’re also excited to begin shipping organic peaches this year from our own orchard.”

    If your customers long for the juicy, flavorful stone fruit their parents and grandparents reminisce about, delight them this year with organic cherries, apricots, peaches and nectarines from Fruit World.

    For more information or to place an order, call (559) 650-0334, or visit fruitworldco.com to learn more about the Fruit World story.

    About Fruit World

    Fruit World is a fresh and creative produce company with generations of history. Fruit World grows and ships the most flavorful fruit in California—including organic and conventional citrus, organic grapes, organic stone fruit, and more—and works with customers who share a passion for quality and taste. They’re all about honoring their growers, staying true to their farming heritage, and keeping family farming thriving into future generations. Visit fruitworldco.com.

  • Whitefly Management on Spring Melons 2021

    Now that the produce season is essentially finished in Yuma, it is time to move into melons.  Spring melon crops are rapidly growing, and so are insect pest populations. Cabbage loopers and leafminers are becoming evident in some areas, and PCAs should start ramping up their monitoring and sampling. More importantly, whitely populations are quietly becoming abundant on the spring melons of all sizes. Adults can easily be found on recently planted melons located at the Yuma Ag Center, and reports from local PCAs suggest that adult populations are beginning to show up on older plantings. As temperatures increase and crops/weeds mature, avoidance of excessive feeding from whitefly nymphs should be the primary concern on all melon types. Although CYSDV does occur in later spring melons, it is rarely yield limiting. But honeydew and sooty mold contamination on cantaloupes, mixed melons and watermelons can significantly reduce quality and marketability is whiteflies are not adequately controlled.  Our research has shown that to prevent fruit yield and quality losses on spring melons, a foliar insecticide treatment should be applied on threshold; that is, when leaves have greater than 2 adult whiteflies per leaf, when averaged across an entire melon field. At this level of adult abundance, immature populations are just starting to colonize, and timing sprays based on the adult threshold has been shown to significantly reduce the chance of yield / quality losses during spring harvests.  This threshold applies for the use of recommended IGRs (Courier, Knack, Cormoran, and Oberon), foliar applied neonicotinoids (Assail, Venom, Scorpion), neonicotinoid-like compounds (Sivanto prime and Transform), diamides, (Exirel and Minecto Pro) and the new feeding disruptors (PQZ and Sefina).  For more information on whitefly management and available insecticides, go to these documents on IPM and Whitefly Management  and  Whitefly Control Options-Spring 2021.     Also, be aware of honey bees and other pollinators in or around melon fields. If bees are present, be sure to carefully read labels and determine bee safety of a product before making an application in a melon field.  If applications are necessary during bloom, only apply a product that is considered bee safe (e.g., PQZ, Sefina, Sivanto, Assail). We also recommend that insecticides only be applied when honeybees are not actively working in the field (e.g. 10:00 pm – 3: 00 am). — John Palumbo, University of Arizona, Yuma College of Ag & Life Sciences