Biology and life table studies of predatory mite, Neoseiulus longispinosus (Evans) on Tetranychus urticae Koch multiplied on pole bean (Phaseolus vulgaris L.)

Abstract

Investigations were carried out on the biology and life table studies of Neoseiulus longispinosus (Evans) on Tetranychus urticae Koch reared on pole bean. Among five temperatures studied total developmental time from egg to adult for N. longispinosus females and males in the laboratory was lowest at 28 °C (100.41 h) and 97.30 h, respectively and was highest at 36 °C (114.43 h) and 106.3 h, respectively. The mean generation time (T) was 14.31 days, male to female ratio in the progeny was 1:3.11, the Intrinsic rate of natural increase (rm) was 0.23, the finite rate of increase (λ) was 0.10, the female adult longevity was 22.55 days while R○, the number of female offspring’s per female per generation was 28.77.