Efectos provocados por Bacillus thuringiensis cepa-13 sobre Chrysopa exterior en condiciones de laboratorio
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Abstract
The strain effect of Bacillus thuringiensis Berliner strain-13 on Chrysopa exterior Navas larval mortality and larval and pupae development period, was evaluated under laboratory conditions by the food immersion method of Corcyra cephalonica Stainton eggs in a Bt strain-13 suspension at concentrations of 5 x 107 and 5 x 108 espores/mL, control group was treated with distilled water. Mortality was recorded daily till four days of larvae exposure to Bt. strain-13 in contaminated food. The length of predator stages development was determined by daily observations. Larvae mortality caused by Bt. strain-13 applications at concentrations of 5 x 107 and 5 x 108 spores/mL did not showed significant difference respect to the control; however the suspension concentration of 5 x 108 spores/mL was classified as slightly toxic. Larvae development period was significantly different between control with 5 days, and treatments with 6 and 6.3 days, respectively. No significant differences were observed in pupae stage. Therefore, it was conclude that Bt. strain has effects on C. exterior larval mortality and larval development duration under laboratory conditions.
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