oa African Entomology - Developmental biology of Amblyseius californicus (McGregor) (Acarina: Phytoseiidae), a predator of tetranychid mites, at three temperatures

Volume 6, Issue 1
  • ISSN : 1021-3589



The development time, survival and fecundity of Amblyseius californicus (McGregor), a predatory mite in deciduous fruit orchards, were determined at 20,25 and 30 C. Using these values the intrinsic rate of increase (rm), mean generation time (T) and net replacement rate (Ro) were estimated at the respective temperatures. In addition, the data were used to estimate the minimum temperature required for development. The rm increased with increasing temperature from 0.122 at 20 C to 0.251 at 30 DC. The Ro was highest at 25 C (11.18 females/female) and was lower at 20 DC (9.71 females/female) than at 30 DC (10.54 females/female), while T decreased with increasing temperature from 20.11 days at 20 C to 10.20 days at 30 C. The estimated minimum temperature for development was 8.3 DC, which indicates that A. californicus could survive the winter on plants in the covercrop in orchards and should be able to control populations of the phytophagous mite, Tetranychus urticae Koch, at temperatures below 30 C.

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