Laboratory assessment of the effects of Bacillus thuringiensis on native Lepidoptera
1998
Peacock, J.W. | Schweitzer, D.F. | Carter, J.L. | Dubois, N.R.
The effect of 2 formulations of Bacillus thuringiensis subsp. kurstaki (Foray 48B and Dipel 8AF) was evaluated on 42 species of native Lepidoptera in laboratory bioassays using instars that are present in the field at the time of gypsy moth suppression applications. Mortality was significant for 27 of the 42 species evaluated against Foray 48B, and 8 of 14 species evaluated against Dipel 8AF. Susceptible species were noted in 5 of 6 families assayed -- Papilionidae, Nymphalidae, Geometridae, Lasiocampidae, Saturniidae, and Noctuidae. The 1 species treated in the Lymantriidae family was not susceptible to B. thuringensis. Treated individuals that survived for a week were likely to reach adulthood. Intrageneric differences in susceptibility to B. thuringiensis were recorded among 8 species of Catocala and 3 species of Lithophane assayed. Of the 18 species assayed as 1st or 2nd instars, mortality was significant, usually exceeding 95%. By contrast, 9 of 11 species not susceptible to B. thuringiensis were assayed as penultimate or ultimate instars. However, species susceptible to B. thuringiensis were found in both early and late instars.
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