Vegetable Crops News

Lady Beetle Predation Not Affected By Bt

The twelve-spotted ladybird beetle, Coleomegilla maculata lengi, is commonly found in potato fields where it feeds on Colorado potato beetle eggs, aphids, and lepidopteran eggs. M-One (Bacillus thuringiensis var. san diego) is commonly used on potato to control Colorado potato beetle larvae. Fortunately, M-One is not lethal to C. maculata larvae even at 10 times the recommended field concentration and C. maculata predation is not significantly affected by M-One either. Larvae consumed an average of 2.1 Colorado potato beetle eggs treated with M-One per day and adults attacked 12.0 eggs per day in laboratory studies. The effects of M-One on reproduction and fertility were not studied; its effects on successive generations needs to be studied before the innocuousness of this biopesticide to C. maculata can be concluded.

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