THE EFFECTS OF TEMPERATURE ON ADULT SURVIVAL,OVPOSITION AND THE INTRINSIC RATE OF INCREASE OF PLUTELLA XYLOSTELLA (L)

SIVAPRAGASAM A. and K.L. HEONG

SUMMARY

Laboratory studies were conducted to determine the effects of temperatures on the adult survival, oviposition and intrinsic rate of increase , r_m, of Plutella xylostella (L), Results showed that temperature had significant effects on adult survival and oviposition rates and generation time. Based on the intrinsic rate of increase (r_m) obtained the temperature most favourable for Plutella populations was found to be around 30°C. The relationship between longevity and temperature was found to fit a logistic equation whilst relationships of oviposition rate and r_m, with temperature were found to fit polynormial equations.

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