1. Injury Symptoms Associated with the Shot Hole Borer

    The polyphagous shot hole borer (SHB), Euwallacea sp., and Fusarium dieback, Fusarium euwallaceae, are a new insect: disease complex causing injury and mortality to numerous native and ornamental hardwood trees and shrubs in southern California. The ambrosia beetle has a wide host range and can complete development in >20 species, including avocado, Persea americana, bigleaf maple, Acer macrophyllum, California box elder, Acer negundo var. californicum, California sycamore, Platanus racemosa, coast live oak, Quercus agrifolia, castorbean, Ricinus communis, red willow, Salix laevigata, and white alder, Alnus rhombifolia.   U.S. Forest Service Region 5 Forest Health Protection recently created a document illustrating...
  2. Wood Utilization Options for Insect-Killed Urban Trees

    Washington, DC (February 2013) – The U.S. Forest Service has released a new handbook, “Wood Utilization Options for Urban Trees Infested by Invasive Species,” to provide guidance on best uses and practices for dead and dying urban trees infected by invasive insects in the eastern U.S.   The downloadable publication, developed by the Forest Service Forest Products Laboratory and the University of Minnesota Duluth, offers advice for considering the many available options for using insect-killed wood. This includes a listing of the wide variety of products and markets that are available for this wood, such as lumber, furniture, cabinetry, flooring,...
  3. Shot Hole Borer – An emerging issue in LA and Orange County

    The Polyphagous Shot Hole Borer is an ambrosia beetle that has a symbiosis with Fusarium sp. and is a serious problem for the Israeli avocado industry.   If you suspect that you have found this beetle or seen symptoms of the Fusarium dieback in your grove or surrounding areas in other host plants please contact either your local farm advisor, pest control advisor, county Ag Commissioner office or Dr. Akif Eskalen by either phone 951-­‐827-­‐3499 or email at akif.eskalen@ucr.edu. You can also call the CAC office at 949-­‐341-­‐1955.  Click here to download a fact sheet with more information.        
  4. Fusarium Dieback on California Avocado

    Both the Fusarium dieback and Tea Shot Hole Borer were found on several backyard avocado (cv. Hass, Bacon, Fuerte, Nabal) trees in residential neighborhoods in South Gate, Downey and Pico Rivera, Los Angeles County, in February and March 2012.   To find out how both the fungus and beetle affect California avocados, symptoms to look for, and what to do if you find evidence of either on your trees, read the PEST ALERT from UC, Riverside. This information if especially important for Southern California residents right now.
  5. Goldspotted Oak Borer Found in Fallbrook

    Deadly pest threatens local oak trees; infested firewood transported into other areas are of paramount concern   Thursday, May 24th, 2012 Fallbrook Bonsall Village News Andrea Verdin Staff Writer     Fallbrook’s iconic oaks might be in grave danger of infestation and destruction.   According to Jess Stoffel, vegetation manager for the County of San Diego, the goldspotted oak borer (GSOB), or agrilus coxalis, was first detected in the county in 2004 during a trap survey for invasive tree pests.   “In 2008 this borer was linked to elevated levels of oak mortality ongoing in San Diego County since 2002,”...
  6. Beetle-Fungus Disease Threatens Crops and Landscape Trees in Southern California

    ScienceDaily (May 8, 2012) — A plant pathologist at the University of California, Riverside has identified a fungus that has been linked to the branch dieback and general decline of several backyard avocado and landscape trees in residential neighborhoods of Los Angeles County.   The fungus is a new species of Fusarium. Scientists are working on characterizing its specific identification. It is transmitted by the Tea Shot Hole Borer (Euwallacea fornicatus), an exotic ambrosia beetle that is smaller than a sesame seed. The disease it spreads is referred to as “Fusarium dieback.”   “This beetle has also been found in...
  7. Spinach Could Be Weapon Against Citrus Scourge

    In a lab not far from the Mexican border, the fight against a disease ravaging the worldwide citrus industry has found an unexpected weapon: spinach. A scientist at Texas A&M’s Texas AgriLife Research and Extension Center is moving a pair of bacteria-fighting proteins naturally occurring in spinach into citrus trees to fight a scourge commonly known as citrus greening. The disease hasn’t faced this defense before and intensive greenhouse testing so far indicates the genetically enhanced trees are immune to its advances. To read the rest of this article, visit Business Week’s website.
  8. Citrus Disease Huanglongbing Detected in Hacienda Heights Area of Los Angeles County

    SACRAMENTO, March 30, 2012 – The California Department of Food and Agriculture (CDFA) and the United States Department of Agriculture (USDA) today confirmed the state’s first detection of the citrus disease known as huanglongbing (HLB), or citrus greening. The disease was detected in an Asian citrus psyllid sample and plant material taken from a lemon/pummelo tree in a residential neighborhood in the Hacienda Heights area of Los Angeles County. HLB is a bacterial disease that attacks the vascular system of plants. It does not pose a threat to humans or animals. The Asian citrus psyllid can spread the bacteria as...
  9. Orange Trees in the Inland Region in Danger of Pest

    Chemical treatment to kill the Asian citrus psyllid in trees on private property began Tuesday in Redlands, California Department of Food and Agriculture officials said. At least six crews are working in Redlands and more than 30 in the Inland region as part of an effort to stop the pest, which can carry a fatal citrus disease called huanglongbing, or citrus greening, said Steve Lyle, the department’s director of public affairs. The teams provide free treatment of citrus and other host plants on private property in areas where psyllids have been detected, Lyle said. The department held town hall-style meetings...
  10. Invasive Citrus Insect Spotted in Highland Park

    A dangerous pest that is threat to Los Angeles’ many citrus trees has been spotted in Highland Park, according to the California Dept. of Food and Agriculture. The pest is called the Asian citrus psyllid, and it is confirmed to be in Imperial, San Diego, Orange, Ventura, Riverside, San Bernardino and Los Angeles counties, which has sparked quarantines in those areas, according to a press release distributed by the Dept. of Food and Agriculture. For the full article from the Highland Park-Mount Washington Patch, click here.