Daily News Archive
Napa CA County
School Board Opposes Community Pesticide Use
According to the Glassy-winged Sharpshooter (GWSS) Task Force of Kern and Tulare Counties, "Ornamental trees and shrubs in the infested Vacaville area have been treated with the foliar materials, Merit® (imidacloprid) and Tempo® (cyfluthrin). Merit also has been injected into the soil to provide control for about a year. Soil injections also are being made on nearby properties to prevent the sharpshooter's spread. The insecticides kill both GWSS adults and nymphs when they feed on treated plants. Treated sites included two commercial and 203 residential properties."
In addition, according to GWSS, a biological control agent, Gonatocerus triguttatus, also is being used to help control GWSS. This tiny, stingerless, parasitic wasp deposits its eggs in the larger GWSS egg masses, killing them as the wasps develop. The county released 1,600 wasps into crepe myrtle trees in Vacaville from late August through mid-September."
Environmentalists have urged the adoption of alternative measures that include cultural practices, biological controls, and the use of more benign materials, such as kaolin clay. The California Department of Agriculture has historically recommended the use of carbaryl and synthetic pyrethroids, both controversial because of their neurotoxic properties.