Effect of Cold Storage on Laboratory Performance of Trichogramma cacoeciae and T. embryophagum


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 F1 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 F1 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 F1 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 F1 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.

Keywords

Cold storage, F1 Progeny, Parasitism, Per Cent Emergence, Longevity, Trichogramma cacoeciae, T. embryophagum.

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