Genetic Analysis of Dicofol Resistance in Two Populations of Twospotted Spider Mite (Acari: Tetranychidae) from New York Apple Orchards

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Abstract
The genetics of dicofol resistance in two populations of Tetranychus urticae (Koch) (Cohn [R1] and Lamont [R2]) was studied. In both populations, the inheritance of resistance was consistent with the hypothesis of control by one major, incompletely recessive gene. No extra nuclear effects were found, but minor modifying factors appeared to be involved. An allelism study of the R1 and R2. populations revealed that the gene conferring resistance resides at the same locus in each resistant culture, or at two very closely linked loci.