BIOLOGICAL AND LIFE TABLE PARAMETERS OF Stethorus gilvifrons (Muls.) (Coleoptera: Coccinellidae) REARED ON Tetranychus urticae Koch.

Document Type : Original Article

Authors

1 Economic Entomology Dept., Fac. of Agric., Mansoura Univ., Mansoura 35516, Egypt

2 Economic Entomology Department, Faculty of Agriculture, Mansoura University, Mansoura 35516, Egypt

3 Plant Protection Research Institute, Agricultural Research Center, Ministry of Agriculture, Giza, Egypt

Abstract

Developmental time and rate of immature stages, growth index, survival percentage, longevity, fecundity, and life table parameters of Stethorus gilvifrons (Muls.) when reared on Tetranychus urticae Kochwere studied at three constant temperatures (20, 25, and 30oC).
There were significant variations in total developmental time of immature stages of the predator (male and female) among the three tested temperatures when the predator was reared on T. urticae. Growth index and developmental rate of S. gilvifronsmales and females were higher at 30oC than 20 and 25oC when reared on the tetranychid mite.
There were significant differences in pre-oviposition period among the three tested temperatures. In addition, there were significant variations among inter-oviposition, oviposition, and total longevity when the predator was reared at the three tested temperatures. Male longevity was significantly shorter at 30oC than at 20 and 25oC when fed on T. urticae. Fecundity rate was significantly higher at 30oC than at 20 and 25oC when fed on T. urticae. The mean generation time (T) and doubling time (DT) were shorter at 30oC than at 20 and 25oC which fed on T. urticae at 30 oC. Generally, the value of gross reproductive rate (GRR), the net reproduction rate (Ro), the intrinsic rate of increase (rm), the finite rate of increase (λ) were higher at 30oC than at 20oC and 25oC. 

Keywords

Journal of Plant Protection and Pathology
Volume 1, Issue 6
June 2010
Pages 393-402

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