Zectran and Naled Affect Incidence of Parasitism of the Budworm Choristoneura occidentalis in Montana

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Abstract
Zectran® (4-dimethylamino-3,5-xylyl methylcarbamate) and naled were sprayed on populations of a budworm, Choristoneura occidentalis Freeman, in a field test on the Bitterroot National Forest, Montana, in July 1965. Their immediate effects on the incidence of parasitism by several internal parasites of this insect were studied. Glypta was the most numerous parasite in C. occidentalis larvae, with Apanteles, tachinids, and Phaeogenes next most numerous. Other species were found in small numbers, and they were generally not affected. Incidence of parasitism by Apanteles and Phaeogenes greatly increased, and that by Glypta and tachinids declined after being sprayed with Zectran. Incidence of parasitism declined slightly in the drainage sprayed with naled; that by Apanteles declined more than that by Glypta, and that by tachinids remained unchanged. Between pre- and post-spray sampling periods, incidence of parasitism increased slightly in 1 check area and decreased slightly in another.

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