Spider Mites:1 Population Suppression by Interspecific Hybridization23

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Abstract
Crosses between female Tetranychus urticae Koch and males of 7 other tetranychid species showed that the cross with T. cinnabarinus (Boisduval) was the only one that resulted in sterile hybrids. Moreover, any production of progeny from subsequent matings was blocked by the initial interspecific mating. When T. urticae and T. cinnabarinus males were placed with T. urticae females in a 1:1 ratio, the T. urticae males mated first 70.6% of the time. All interspecific mating resulted in a reduction in egg deposition. Four inundative releases of T. cinnabarinus males at 4-day intervals into an established population of T. urticae produced marked suppressive results.

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