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Not AvailableStudies were carried out to assess biological attributes of arrhenotokous (sexual) and thelytokous (asexual) forms of Trichogramma pretiosum Riley under the laboratory conditions. Selected arrhenotokous and thelytokous T. pretiosum was used in studies of finding the per cent parasitism, per cent desiccation, sex ratio, per cent emergence and per cent male and female emergence on the five selected different sized containers under constant and variable number of host parasitoids release. The mean percent parasitization in arrhenotokous species varied from 24.2 - 47.8% from all five different sized containers under both constant and variable no of releases as compare to 45.3 - 62.2 % in the lytokous species. The mean number of days to adult emergence ranged from 10.05 to 10.3 under both constant and variable number of parasitoid release in both the species of Trichogramma pretiosum. In both forms of T. pretiosum the per cent desiccated eggs increased as the size of three containers increased.Not Availabl

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Not AvailableTrichogramma pretiosum Riley is an important egg parasitoid on lepidopterans. Biological attributes of arrhenotokous and thelytokous T. pretiosum, was studied on Corcyra cephalonica under laboratory condition. The adult longevity in arrhenotokous and thelytokous T. pretiosum were 10.4 days and 10 days, respectively. The total female progeny produced during entire life span was 147.08 in thelytokous T. pretiosum and 90 in arrhenotokous T. pretiosum. The sex ratio of arrhenotokous T. pretiosum was 1:1 while for thelytokous it was 5:95 (M/F). The intrinsic rate of increase was 0.42 in arrhenotokous T. pretiosum and 0.48 in thelytokous T. pretiosum. These results revealed that in the net reproductive rate, weekly multiplication rate and the number of estimates in F2 generation are more in thelytokous T. pretiosum compared to arrhenotokous T. pretiosum. These results confirmed that biological attributes of arrhenotokous and thelytokous T. pretiosum are different. Thelytokous T. pretiosum have more practical implications in the field of biological control.Not Availabl