Bacteriological Insecticide M-One Effects on Predation Efficiency and Mortality of Adult Coleomegilla maculata lengi (Coleoptera: Coccinellidae)

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Abstract:

Laboratory experiments were done to determine whether the adult Co-leomegialla maculate lengi Timberlake was affected by ingesting M-One, a commercial formulation of Bacillus thuringiensis var. san diego used to control the Colorado potato beetle, Leptinotarsa decemlineala (Say). Over a period of 10 consecutive days, consumption of pollen contaminated with 200 ml M-One per liter (5.6 x 109 CPBIU per liter) had no lethal effects on adult C. maculata. The level of predation by adult C. maculata on Colorado potato beetle eggs was reduced by M-One. At the manufacturer's recommended field rate of 20 ml M-One per liter (i.e., 5.6 x 108 CPBIU per liter), the number of eggs attacked was 37.0 and 14.5% lower than the untreated eggs, respectively, 3 and 24 h after tl1l' beginning of the test. The feeding behavior and results of a water versus 200 ml M-One per liter two-choice test suggest that the decrease in food intake caused by M-One cannot be explained by a 8-endotoxin-induced paralysis of the mouth parts or midgut.

Document Type: Research Article

Publication date: February 1, 1994

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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