Abstract
The biology of Paracheyletia bakeri (Ehara) and its effectiveness as a predator of Tetranychus urticae Koch was studied in the laboratory. P. bakeri took an average of 47 days to mature at 22°C. After this prolonged developmental period, each female laid an average of 0.7 eggs per day during an ovipositional period of 36 days. From the life history data, the intrinsic rate of increase was determined to be 0.05 females produced per female per day. During a generation time of 55 days the net reproductive rate for P. bakeri was 15.6 at 22°C. Prey consumption ranged from 0.9 male T. urticae per day for a larva of P. bakeri to 1.6 males per day for an adult female. During population interactions of P. bakeri and T. urticae, this predator was unable to reduce a high population of T. urticae or maintain a population of T. urticae at a low density.
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