Impact of Cold Storage Temperature and Period on Performance of Trichogramma Evanescens Westwood (Hymenoptera: Trichogrammatidae)

Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae) was mass reared in the eggs of Sitotroga cereallela Olivier (Lepidoptera: Gelechiidae). The impact of cold stored pupae of T. evanescenes at 4, 7 and 10C for 1 to 8 weeks was considered as adults emergence, parasitism and femalesʹ percent was considered. The results showed that these two factors of storage temperatures and time substantially and negatively influenced produced adults and F1. These effects were regressed for time at each studied temperature. Results revealed correlation values of -0.913 to -0.986 for adults and -0.880 to -0.973 for F1 with P values of 0.0006 to 0.0001, for studied characters, respectively. This reduction in stored pupae performance should be considered in T. evanescens mass production manipulation for biological control