Field Measurements of Selection for Twospotted Spider Mite (Acari: Tetranychidae) Resistance to Dicofol in Apple Orchards

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Mortality of Tetranychus urticae Koch resistant or susceptible to dicofol was measured in apple trees to estimate the selective effect of dicofol applications on spider mite populations. Mortality of RR, RS,SS(female), Rand S (male) genotypes was measured in six field experiments. An average of 3.9 RR and 3.7 RS mites survived after treatment for every SSfemale; 3.4 R males survived for each Smale. Dicofol resistance was incompletely dominant under field conditions, in contrast with its recessive inheritance in laboratory bioassays. Concentration-response lines were constructed to compare responses of T. urticae to continuous and discontinuous dicofol residues. LC"b's were twofold higher (SS) or threefold higher (RS)on discontinuous residues than on continuous residues. Selection resulting from single dicofol applications is discussed in the context of ongoing efforts to establish appropriate acaricide rotations for control of T. urticae.

Document Type: Research Article

Publication date: February 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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