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Spray
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level spray runs over the designated blocks, which had been marked with helium balloons by a ground support crew.
Most of the 5,470 acres in the county included in the AIPM spraying were treated with Bt (Bacillus thuringienses), a bacterial disease which interferes with the caterpillars’ digestive processes, according to Gary McAninch, director of the AIPM program.
Another 640 acres received treatment with Dimilin, a chemical which inhibits the caterpillars’ formation of a new exo-skeleton as it grows and molts its outgrown external skeleton. Dimilin is more effective than Bt, Mr. LeMarr explained, giving a 95 to 98 percent control rate if applied correctly, but it is not recommended for use near water since it can affect other insects as well and may interfere with the food chain.
AIPM sprayed the remaining 155 acres in the county with Gypchek, a recently discovered viral insecticide which is specific to gypsy moths. It is extremely expensive, however, and supplies are limited. It has been used in the Shenandoah National Park for the past two seasons on an experimental basis.
The areas sprayed with Dimilin and Bt require only one application, Mr. McAninch said, but the blocks treated with Gypchek will be resprayed five days after the first application.
96.3%