Tuesday, 28 October 2003
D0428

This presentation is part of : Display Presentations, Section F. Crop Protection Entomology

Enhancemant of Bacillus thuringiensis with monosodium glutamate against larvae of obliquebanded leafroller (Lepidoptera:Tortricidae)

Maciej A. Pszczolkowski1, Jay F. Brunner2, Michael D. Doerr2, and John J. Brown3. (1) Kansas State University, Department of Entomology, 123 West Waters Hall, Manhattan, KS, (2) Tree Fruit Research and Extension Center, 1100 N Western Ave, Wenatchee, WA, (3) Washington State University, Department of Entomology, PO Box 646382, Pullman, Washington

Monosodium glutamate, a taste enhancer widely used in the food industry, was tested in the laboratory to determine its phagostimulatory effect on larvae of Choristoneura rosaceana (Harris). Larvae fed apple leaves treated with 50-700 �g/l monosodium glutamate increased leaf tissue consumption by approximately 40%. The stimulatory effect of monosodium glutamate (at 675 �g/l concentration) was maintained throughout 10 days of continuous exposure. Adding 675 �g/l monosodium glutamate to commercial formulation of Bacillus thuringiensis ssp. kurstaki, DiPel 2X DF, lowered LC50 from 450 to 150 �g/l (P<0.05, Lethal Ratio Significance Test), indicating good potential for monosodium glutamate to enhance activity of Bacillus thuringiensis- based formulations.

Species 1: Lepidoptera Tortricidae Choristoneura rosaceana (obliquebanded leafroller)
Keywords: feeding stimulant

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