Biological Studies of Typhlodromips sessor (Acarina: Phytoseiidae)1

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Abstract
Typhlodromips sessor DeLeon, reared upon Tetranychus urticae Koch at 25 °C and 90% RH, showed an average duration of 61.5, 53.0, 42.0, 25.5, and 56.0 h for the egg, larval, protonymphal, deutonymphal and preoviposition stages, respectively. Higher temperatures produced more rapid development; at 90% RH the temperature variables of 20°, 25°, and 30°C led to average egg-to-adult developmental times of 146, 184, and 272 h, respectively. The mites were susceptible to desiccation and none developed to maturity at 64% RH and very few at 75% RH. T. sessor was able to utilize a variety of foods of plant and animal sources. Reproductive rates of mites fed T. urticae, Aculus schlechtendali Nalepa, Thrips tabaci Lindeman, Haplothrips subtilissimus Haliday, pollen from Cirsium vulgare, or a tarsonemid mite averaged 0.79, 0.70, 0.51, 0.23, 0.15 and 0.13 eggs/female/day, respectively. In comparison with most other phytoseiids studied, the developmental time of this species was longer and the reproductive rate lower. However, such differences might be rendered less important by its adaptation of parthenogenicity.

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