Comparison of Responses of Crosses of European Red Mites (Acari: Tetranychidae) to Dicofol in Laboratory and Field Bioassays

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Responses of European red mite, Panonychus ulmi (Koch), populations to dicofol were compared in two laboratory bioassays and one field bioassay. Concentration-response regressions estimated with an enclosed petri dish bioassay in the laboratory suggested an intermediately dominant mode of gene expression based on the response of reciprocal F1 crosses (i.e., intermediate response). Concentration-response regressions estimated with a leaf-disk residual bioassay in the laboratory suggested an incompletely recessive mode of inheritance. In a bioassay with field-weathered residues, dominance interpretations changed as residue declined. Mortality of F1 heterozygotes was similar to that of susceptible parents at high dicofol concentrations (recessive), intermediate between that of resistant and susceptible parents after 7 d (codominant), and more similar to that of the resistant parent after 14 d (dominant). Resistant genotypes were repelled in greater numbers at high residues than susceptible genotypes. We concluded that laboratory-generated bioassay data alone may not be sufficient to predict responses of mites to acaricides in the field, and that dominance determinations could be influenced by behavioral responses. Resistance management programs should rely more heavily on field data, where factors such as behavioral effects and heterogeneity of residue levels may be included.

Document Type: Research Article

Publication date: April 1, 1993

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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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