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Everybody who's involved in this thing understands the significant risks involved in the county of Napa. While Napa vintners have reason to be worried about the recent increase in sharpshooter findings in Northern California, Napa County agricultural commissioner Dave Whitmer said, "I have confidence in Susan and Solano County and the way that they have responded to this. "At this point," said Cohen, "we are looking for more sharpshooters and addressing the issue of removing more foliage and spraying." The glassy-winged sharpshooter produces one to two generations per year.
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The droplets can appear like rain but only under the infested tree when the liquid dries, it appears similar to white-wash. On May 10, aides discovered four more egg masses and two live nymphs in the same area. One of the first symptoms of glassy-winged sharpshooter infestation is caused by the large quantities of sticky fluid emitted as fine droplets. "Crape myrtle is a preferred host for the glassy-winged sharpshooter," Cohen said. "We've been keeping a close eye on the area since our initial finds last June, and we fully expected to see some activity this year," Cohen said.Īn agriculture department aide found the first two egg masses on May 9 on a crape myrtle behind the Vacaville Wal-Mart. Solano County agricultural commissioner Susan Cohen said the finds came as no big surprise to local officials. The same area was declared infested by the vineyard pest last year. This time, already-hatched egg masses and nymphs have been discovered in Vacaville, around 14 miles from vineyards in the western part of Solano County and southeastern Napa County. Check out my blog at This work is supported by Crops Protection and Pest Management Competitive Grants Program from the USDA National Institute of Food and Agriculture.With spring in full swing, the dreaded glassy-winged sharpshooter, an insect that carries grapevine-killing Pierce's disease, has again made an appearance in Northern California. If you feel the need to manage glassy-winged sharpshooters, try using insecticidal soaps or horticultural oils to conserve beneficial insects in the landscape.įor more information or help with identification, contact Wizzie Brown, Texas A&M AgriLife Extension Service Program Specialist at 512.854.9600. Unfortunately, it does not take high population levels of sharpshooters for disease transmission to occur, so it is unknown if management with insecticides can help to reduce disease spread. The main reason for managing glassy-winged sharpshooters is to control the Xylella bacterium. Plant hosts can range from woody plants to annual and perennial herbaceous plants. Glassy-winged sharpshooters can be found in a wide variety of habitats, from urban landscapes to croplands and woodlands, and can feed on hundreds of plant species. Eggs look like a greenish blister below the surface of the leaf, but after the eggs hatch the leaf tissue turns brown and remains as a brown scar on the plant. They are laid in a single layer, side-by-side. Once she lays eggs, she uses the chalky substance to cover them.Įggs are laid in masses of about 10-12 under the lower leaf surface. She transfers this substance to the upper wings, creating white spots.
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Females secrete a chalky white substance before laying eggs. Wings may appear brown in color due to wings folding over the brown body. The insects are usually dark brown-to-black in color with clear wings that have red venation. Glassy-winged sharpshooters are large in comparison to other leafhoppers at about ½ inch in length. The bacteria can then be transferred to a different plant when it feeds again. When a sharpshooter feeds on an infected plant, it can get the bacteria in it’s mouthparts. At this time there are no cures for these diseases. This bacterium is responsible for Pierce’s disease, various forms of leaf scorch, phony peach disease, and variegated citrus chlorosis. While these insects usually do not cause much damage from feeding, they are capable of transmitting the bacterial disease, Xylella fastidiosa. Glassy-winged sharpshooters are large, dark-colored leafhoppers.