Response of the Carrot Weevil,Listronotus oregonensis(Coleoptera: Curculionidae), to Strains ofBacillus thuringiensis |
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Authors: | FE Saadé GB Dunphy RL Bernier |
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Institution: | aDepartment of Natural Resource Sciences, Entomology Unit, McGill University, Macdonald Campus, 21,111 Lakeshore Road, Ste Anne de Bellevue, Quebec, H9X 3V9, Canada;bImperial Chemical Industries Biological Products, North American Technical Centre, 2101 Hawden Road, Mississauga, Ontario, L5K 2L3, Canada |
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Abstract: | Mortality and frass production bioassays were used to investigate the toxicity of seven strains ofBacillus thuringiensisagainst the adult carrot weevil,Listronotus oregonensis(Le Conte). A semi-artificial diet of carrot foliage with 4% agar was selected to maximize feeding by the insects.Bacillus thuringiensissubsp.tenebrionis(Krieg, Huger, Langenbruch, and Schnetter) (BTT) and two unidentifiedB. thuringiensisstrains, A30 and A429, gave the lowest LC50values. The frass bioassay supported the conclusions of the mortality assay. Mortality of adults continued after their removal from the insecticidal medium, with the highest mortality being caused by strains A429 and BTT. Survivors from the frass bioassay, initially exposed to strains A30, A429, and BTT, did not resume normal levels of feeding after their removal from the insecticidal medium. |
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Keywords: | Listronotus oregonensis Bacillus thuringiensis frass production |
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