Abstract
Phytoseiulus macropilis (Banks) was studied in the laboratory to determine its potential rate of population increase when fed on eggs of Tetranychus urticae Koch. The shortest developmental period was 4.7 days for males, and 5.8 days for females reared at 27 + 2?C and 90% + 5% RH under 12L:12D. Mean generation duration was 14.2 days with an average reproductive rate of 1.89 eggs per female per day. Predation of P. macropilis, expressed as the number of prey eggs consumed per individual, was 5.9 eggs for the immature stages and 194.1 eggs for the adult or 7.9 eggs consumed per adult per day. Mean adult longevity was 25.3 days. For each predator egg produced, 4.3 prey eggs were consumed. The intrinsic rate of predator population increase (r1,) was calculated as 0.27 individuals per female per day.
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