Abstract
Crop rotation is an important and effective management tactic for the Colorado potato beetle, Leptinotarsa decemlineata (Say). Colorado potato beetles in rotated potato, Solanum tuberosum L., fields tend to have lower frequencies of pesticide resistance than in nonrotated fields. One explanation that has been suggested for this phenomenon is that resistant beetles disperse less readily than susceptible beetles, and that crop rotation thereby selects for susceptibility. However, a comparison of resistance frequencies and farm practices indicates that insecticide treatment histories have a greater influence on resistance than crop rotation. Crop rotation may indirectly reduce selection for resistance by reducing the number of insecticide treatments. No evidence that crop rotation selects against resistant beetles was found.
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