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Variability in Response of Laboratory-Reared and Field-Collected Populations of Tetranychus spp. (Acari: Tetranychidae) to Hexythiazox

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Variability in hexythiazox (Savey) toxicity to the eggs of spider mites (Tetranychus spp.) from six laboratory colonies and 26 field collections (5-6 each from cotton, almonds, pears, roses, and strawberries) was determined using a leaf disk bioassay method. The difference in the response of T. urticae Koch and T. pacificus McGregor to hexythiazox was 10-fold when contact and residual methods were compared. Intraspecies differences in susceptibility were found with laboratory colonies of both T. urticae and T. pacificus, indicating that a low level of cross-resistance to other compounds may exist. Variation in susceptibility of fjeld-collected spider mites to hexythiazox within and between crops was also found for both species. Field collected T. urticae were significantly more susceptible to hexythiazox than were field-collected T. pacificus. Few significant differences were found when responses of field-collected spider mites tested on their original host plant leaves were compared with responseson cotton cotyledons in the laboratory. The use of laboratory-reared cotton had far more advantages than the use of host leaves. These results suggest that continued monitoring of hexythiazox susceptibility, determination of cross-resistance patterns, and the implementation of resistance management tactics are warranted before and after this compound is registered for use.

Document Type: Research Article

Publication date: August 1, 1991

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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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