Arrested feeding of the Asiatic rice borer (Lepidoptera: Pyralidae) by Bacillus thuringiensis
1989
Rombach, M.C. | Aguda, R.M. | Picard, L. | Roberts, D.W.
Arrested feeding of the Asiatic rice borer, Chilo suppressalis (Walker) by the Bacillus thuringiensis Berliner formulations Dipel and Thuricide was tested in the laboratory. Larvae were fed B. thuringiensis incorporated into artificial diet for 48 h, after which they were transferred to diet free of B. thuringiensis. The relative amount of B. thuringiensis ingested was determined by weighing the larvae and diet. The endotoxin inhibited feeding after an initial dose was ingested, but some larvae recovered after 36, 60, and 84 h on the diet free of B. thuringiensis. Mortality was low even after 180 h. Probit analysis based on arrested feeding rather than mortality showed no significant differences in toxicity between the products. Measuring feeding activity of Asiatic rice borer on artificial medium provides a method of comparing effectiveness of B. thuringiensis materials for this insect.
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