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A Biological and Toxicological Study of Strains of Two-Spotted Spider Mites1

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Strains of two-spotted spider mite, Tetranychus urticae (Koch), collected from the rose variety Better Times from 5 greenhouses in New Jersey, were compared toxicologically and biologically with a known insecticide-susceptible and a known resistant strain. All strains were reared in the greenhouse for 12 months, using specially designed isolation cages.

Comparison of LC50's of parathion, ethion, dicofol, and Aramite® (2- (p-tert-butylphenoxy) isopropyl 2-chloroethyl su\fite) showed that all candidate colonies were resistant to parathion and ethion, while the response to dicofol and Aramite varied from those that were almost susceptible to those having a high resistance level.

Differences in egg production, egg viability, and length of life cycle were found in all colonies. Susceptible mites demonstrated the greatest overall reproductive capacity in that they oviposited the most eggs, had the greatest percent of viable eggs, and the shortest life cycle. It was concluded that each strain was biologically as well as toxicologically distinct.

Document Type: Research Article

Publication date: August 1, 1967

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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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