Mechanisms of Organophosphate, Pyrethroid, and DDT Resistance in Citrus Thrips (Thysanoptera: Thripidae)

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Abstract:

Synergism with metabolic inhibitors showed that resistance to fluvalinate was polyfactorial in a strain of citrus thrips, Scirtothrips citri (Moulton). Mixed-function oxidases were responsible for a major portion of the resistance (synergism as much as 61-fold at LCBO), followed by est erases (synergism as much as 14-fold at LeBO) Glutathione S-transferases may or may not be involved in fluvalinate resistance. Lack of total fluvalinate synergism with combinations of metabolic inhibitors, as well as limited synergism of DDT with piperonyl butoxide + dichlorophenyl ethanol, suggests a knock-down resistance (kdr) component. Sesame oil synergized fluvalinate up to 48-fold at LCoo,suggesting the possible use of this product in the field. Resistance to dimethoate that was apparent in the parental TB84 strain before selection with fluvalinate may be due to enhanced activity of mixed-function oxidases.

Document Type: Research Article

Publication date: October 1, 1990

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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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