California Fruit and Vegetable

Tag: Asian Citrus Psyllid

  • CLas-positive Asian Citrus Psyllid Found in Riverside Commercial Grove

    An Asian citrus psyllid (ACP) sample – confirmed positive for Candidatus Liberibacter asiaticus (CLas) the bacteria that causes Huanglongbing (HLB) – was collected from a commercial citrus grove in the Woodcrest area of Riverside County. Confirmed by Citrus Research Board’s Jerry Dimitman Laboratory, this single adult psyllid is the first CLas-positive ACP found in a commercial citrus grove in California.

    While a positive ACP detection in a commercial grove is cause for serious concern, as of today, HLB has not been detected in any California commercial groves. That said, it is more crucial than ever that we stop the disease from spreading by eradicating the Asian citrus psyllid in commercial groves. The cost to manage the Asian citrus psyllid is far less than any potential costs or loss to the industry should HLB take hold throughout our state.

    An expansion of the HLB quarantine zone will not be established as a result of the CLas-positive ACP detection and CDFA staff is swiftly conducting surveys and collecting samples per the ACP/HLB Action Plan  from the perimeter of all commercial groves and all residential HLB host plants that are located within a 250-meter radius around the find.

    While treatment is not mandatory as a result of the detection, all growers within 250-meters of the find site will be notified to apply insecticides to all HLB host material within the designated area with materials recommended by the University of California (UC).

    Currently, the best way to stop the disease from spreading is to stop the ACP. To stop the ACP, we must restrict its movement and suppress existing psyllid populations. It is critical to follow best practices and review recommendations from the UC on how to protect commercial citrus groves from HLB. Regulations are in place to help prevent the spread of the pest and disease. All growers, packers and haulers must comply with all California Department of Food and Agriculture, county and federal regulations, including quarantines.

    Growers in Riverside County may contact the County Agricultural Commissioner’s office or the CDFA Pest Hotline at 800-491-1899 for additional information. If you see or suspect ACP or HLB symptoms in your grove, please notify the CDFA hotline. – By the Citrus Pest & Disease Prevention Program

  • Argentine Ant Inhibits Biocontrol Options for Deadly Citrus Pests

    Growers want to minimize their pesticide use in the orchard; but when you have invasive pests like the Argentine Ant protecting aphids and psyllids from natural predators, your options are limited.  Watch this brief interview with Greg Simmons from the USDA-APHIS as he explains and read more about it in California Fresh Fruit Magazine.

  • CA Red Scale Resurfaces in Citrus Due to Asian Citrus Psyllid Treatments

    With the threat of the deadly Huanglongbing citrus greening disease coming to the state, California citrus growers are doing all they can to keep the disease vector asian citrus psyllid out of their orchards; however, these treatments are also taking out natural enemies for red scale, causing a resurgence of the pest in California orchards. Watch this brief video as researcher David Holden explains, and read more about it in California Fresh Fruit Magazine.

  • Challenges and Successes for the California Citrus Industry

    With all the regulatory and economic challenges facing our agricultural industries, California growers understandably have a lot to grunt and complain about; however, if growers see these challenges as opportunities and work together to overcome them, so much more can be accomplished, as has been done in the California citrus industry.  Check out this brief video interview with former President of the California Citrus Mutual, Joel Nelsen, as he explains. Read more about it in the coming issue of California Fresh Fruit Magazine.  Don’t currently receive the publication?  Subscribe for free at https://malcolmmedia.com/california-fresh-fruit-subscriptions/.

  • CA Detections of Citrus Disease HLB up 160 Percent

    HLB infected Tree

    Stakes at All-Time High for Backyard & Commercial Trees in 2019

    Detections of Huanglongbing (HLB), an incurable plant disease that kills citrus trees, increased by 160 percent in 2018 compared to the previous year, signaling the growing threat to the state’s iconic citrus trees, landscape and economy.

    HLB is spread by a small pest called the Asian citrus psyllid as it feeds on citrus tree leaves. The disease is not dangerous to humans or pets, but it is fatal for citrus trees and has no cure. Once a tree is confirmed with the disease, it must be removed from the property in order to protect neighboring citrus trees.

    The disease was first discovered in California in 2012 in Hacienda Heights. HLB was detected in 269 trees in 2017 and 699 trees in 2018, with a majority of these occurring in Los Angeles and Orange counties. The disease has not yet been detected in a California commercial grove.

    HLB has devastated commercial citrus production in Florida. Over the course of 10 years, Florida’s commercial citrus industry lost $7.8 billion in revenue, 162,200 citrus acres and more than 7,500 jobs due to HLB. Should the disease spread from backyard trees in Southern California to nearby commercial citrus groves, the livelihood of California’s citrus production could impact about 3,900 farmers and 292,000 acres of citrus production in the state. Commercially grown citrus contributes $7 billion in economic impact to the state and employs more than 22,000 individuals.

    “The livelihood of California’s commercial citrus industry and the generations of families it supports is at risk because of HLB,” said Jim Gorden, a citrus grower in the San Joaquin Valley and chair of the Citrus Pest & Disease Prevention Committee. “We are at a crossroads, and we must all work together to do what is necessary to protect our citrus.”

    Asian Citrus Psyllid Adults

    The California Department of Food and Agriculture (CDFA) has established quarantines throughout the state that limit the transport of citrus across state and international lines, and between areas where the psyllid and disease have been found. Additionally, CDFA has agriculture crews canvasing the state to inspect backyard citrus trees for the Asian citrus psyllid and HLB.

    “The Department is committed to our partnership with California’s commercial citrus industry and residential citrus growers to fight HLB,” said Victoria Hornbaker, interim director of the citrus program at CDFA. “With more than half of California residences estimated to have a citrus tree on their property, and California citrus production supporting billions of dollars in our state’s economy, we all play an instrumental role in protecting our citrus.”

    California residents play an important role in protecting the state’s citrus trees. Residents should: 

    • Proactively inspect their citrus trees for the Asian citrus psyllid and HLB monthly, and whenever watering, spraying, pruning or tending trees.
      • Adult Asian citrus psyllids are brown, about one-eighth of an inch long, and feed with their body at a 45-degree angle on citrus leaves.
      • Symptoms of HLB include blotchy and yellowing leaves, premature and excessive fruit drop, lopsided fruit, and bitter, inedible fruit.
    • Call the state’s pest hotline at 800-491-1899 if the pest or disease is spotted.
    • Cooperate with agriculture officials who may ask to inspect or treat their citrus tree.
    • As part of tree maintenance, visit a local nursery or garden center to get advice on products that can help protect citrus trees.
    • When pruning citrus trees, be sure to dry out citrus clippings or double bag them before removing the plant material from the property.
    • Refrain from moving citrus plants, foliage or fruit as doing this may unknowingly spread the pest.

    More information and photos of Asian citrus psyllids and HLB symptoms are available at CaliforniaCitrusThreat.org.