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sprayed. Landowners whose land is eligible for the program will be notified and offered the option of opting out if they do not wish to have their land sprayed.
Two types of spray have commonly been used against the gypsy moth. Bt (Bacillus thuringienses) is a bacteriological disease which paralyses the caterpillar’s digestive system. It affects any leaf-chewing caterpillars which ingest it. Since gypsy moth caterpillars hatch out earlier than most others, Bt can be specific for the gypsy moth if used early enough in the season.
Dimilin is a chemical spray which interferes with insects’ forming exoskeletons as they moult. It can affect crustaceans and is not recommended for use over open water, where it could affect the food supply of fish. Tom Cary, assistant supervisor for the Virginia Department of Agriculture, who has worked on the AIPM study, said Dimilin was not recommended for use east of the Blue Ridge because of its potential harm to fish during the past year. He.said he did not know w'hich spray would be recommended this year.
Mr. Cary said whenever there is a large rise in the gypsy moth population, as there was in Rappahannock this year, the population will eventually crash, but the moths will come back. He said a variety of predator species take a toll on the caterpillars and moths, and there is a substantial population of predators in Rappahannock.
93.9%