Detoxifying EnzynIes in Greenhouse and Laboratory Strain of Beet Army worm (Lepidoptera: Noctuidae)
Authors: LAECKE, KRISTIAAN VAN; SMAGGHE, GUY; DEGHEELE, DANNY
Source: Journal of Economic Entomology, Volume 88, Number 4, August 1995 , pp. 777-781(5)
Publisher: Entomological Society of America
Abstract:The intensive use of insecticides to control the beet army worm, Spodoptera exigua, in greenhouse crops in The Netherlands may lead to tolerance. Differences in toxicity to commonly used insecticides are explored in a laboratory susceptible population obtained from France (L) and a population collected from greenhouses in The Netherlands (G), in which reduction in pesticide efficacy was observed. The greatest reduction in susceptibility for the G strain was noticed with deltamethrin (6- to 8-fold). We detected no difference in biological activity toward methomyl between the 2 pest populations. The G:L ratio at the LC50 level for L5 larvae was 2.2 and 3.1 for diflubenzuron and teflubenzuron, respectively. Rates of enzyme activity were significantly greater in the greenhouse population than in larvae from the laboratory-susceptible population for the substrates of glutathione S-transferases (l-chloro- 2,4-dinitrobenzene [CDNB] [1.2-fold], l,2-dichloro-4-nitrobenzene [DCNB] [lA-fold]), microsomal oxidases (N-demethylase [l.4-fold], and O-demethylase [2-fold]), carboxylamidases (1.7-fold), and acetylchqlinesterases (1.5-fold). We observed no significant differences between the rates of general ester hydrolysis for α- and B-naphthyl acetate. The G strain appears to have less sensitive acetylcholinesterases, because bimolecular order rate constants were 1.9- and 2.7-fold lower for methomyl and dichlorvos, respectively. In addition to target site insensitivity in the G population, the diversity of enhanced detoxifYing enzymes may contribute to a reduced susceptibility to a wide range of insecticides.
Document Type: Research Article
Publication date: 1995-08-01
- 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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