![]() ![]() The GWSS can spread the bacterium Xylella fastidiosa, which causes Pierce’s disease in grapes, an incurable disease. Fresno County, which had few findings in the past two decades, caught just over 200 in 2019, but officials trapped 1,800 in 2020. Department of Agriculture Animal and Plant Health Inspection Service’s Plant Protection and Quarantine.Ī threefold increase of GWSS was seen in Tulare County last year, from around 10,000 to nearly 30,000. Kern County traps showed a threefold increase from below 50,000 to more than 150,000 last year, according to the U.S. A warm winter and spring caused populations in the southern San Joaquin Valley to surge. Unfortunately, it made a fast comeback in 2020, probably due to unusually warm winter weather. The glassy-winged sharpshooter (GWSS) is a pest that made California headlines from the late 1980s until its suppression at the turn of the new century. The insect grower regulator buprofezin can be used to control the immature stages of the sharpshooter.Glassy-winged sharpshooter (Photo courtesy of University of California, Riverside) These products could be apply to plants that have a sharpshooter infestation prior to shipping. Products containing carbaryl, methiocarb, bifenthrin, cyfluthrin, permethrin and pyrethrins may be registered for sharpshooter control. Many formulations of systemic insecticides containing imidacloprid or acetamiprid can be used to provide residual control of adults and nymphs however, it is still important to inspect treated trees and other plants before shipping to ensure there are no hitchhikers. If you are shipping into Arizona, California, and Oregon you should have your plants inspected by the Texas Department of Agriculture to have glassy-winged sharpshooter included on your certificate. If leaves are present, inspect the underside of the leaves for eggs. Inspect the entire tree to ensure that there are no adults or nymphs present on the plants at the time of shipping. The peak population occurs in Texas around Memorial Day. A second peak in adult activity occurs in late summer. Nymphs hatch in about two weeks and proceed to feed into leaf petioles or small stems, while they progress through four molts before becoming winged adults. Over-wintering adults lay their eggs in early spring. Watery excrement often collects on either side of the insect, appearing as large white spots. The upper parts of the head and back are stippled with ivory or yellowish spots with the wings being partly transparent with reddish veins. The nymphs do not have wings and are generally smaller than the adults, ranging in size from 1/10 inch to nearly 1/2 inch long.Īdults are approximately 1/2 inch in length and are dark brown to black with a lighter underside. Nymphs are greenish grey and similar in shape to the adults. Egg masses appear to be greenish water blisters on the undersides of the leaf. As a result, Arizona, California, and Oregon have instituted quarantines for this insect, and it is important to make sure Texas nurseries are not exporting this pest.Įggs are sausage-shaped and are laid side-by-side under the leaf epidermis in masses ranging from 1 to 27. Glassy-winged sharpshooters are not nursery pests however they transmit Pierce’s disease in grapes. Known hosts in Texas include pine, sweet gum, citrus, stone fruit, crepe myrtle, ash, birch, and holly. The glassy-winged sharpshooter feeds on a wide variety of plants with a host range of over 200 species. While most nursery producers are not familiar with this pest, it has been found east of a line from Ft. The Departments of Agriculture in the states of Arizona, California, and Oregon are now requiring that plants shipped into their state are free of all glassy-winged sharpshooter, Homalodisca coagulata, life stages. Ludwig, Extension Program Specialist – IPM
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