Abstract
Trichogramma cacoeciae Marchal and T. embryophagum Hartig were cold stored (6°C) in their pupal stages for 75 days. Biological parameters like per cent emergence, parasitism and longevity of F 1 progeny of both the species were studied at an interval of 5 days and compared with untreated control. Negative correlations for per cent emergence (r= -0.93 and -0.94), parasitism (r= -0.88 and r= -0.83) and longevity (r= -0.89 and r= -0.73) were observed both for T. cacoeciae and T. embryophagum respectively. Overall per cent emergence, parasitism and longevity of the F 1 progeny of T. cacoeciae were found better and statistically significant than T. embryophagum . Regression model for each parameter has also been established. Life time parasitism of Corcyra eggs by F 1 progeny declined from 113.2 to 5.6 and 97.0 to 2.6 in T. cacoeciae and T. embryophagum respectively. More than 50 per cent loss in emergence, parasitism and longevity in the F 1 progeny of T. cacoeciae and T. embryophagum were observed after 55 and 50 days, 15 and 20 days and 5 days of cold storage (6°C) respectively.
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