Bacteriological Insecticide M-One Effects on Predation Efficiency and Mortality of Adult Coleomegilla maculata lengi (Coleoptera: Coccinellidae)
- 1 February 1994
- journal article
- Published by Oxford University Press (OUP) in Journal of Economic Entomology
- Vol. 87 (1) , 39-43
- https://doi.org/10.1093/jee/87.1.39
Abstract
Laboratory experiments were done to determine whether the adult Coleomegialla 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 × 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 × 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 the 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 α-endotoxin-induced paralysis of the mouth parts or midgut.Keywords
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