Biology of Uscana mukerjii (Mani), a potential parasitoid for the biocontrol of bruchid pests (Trichogrammatidae; Hymenoptera).
Adults of Uscana mukerjii, an egg parasitoid of bruchids, emerged after cutting a circular hole in the chorion of the host egg. The average pre-oviposition period fluctuated between a minimum of 29.14 minutes and a maximum of 59.42 minutes in hot and cold months. Eggs of Callosobruchus maculatus up to 72-h-old were accepted for oviposition but U. mukerjii preferred 0- to 24-h-old eggs. Unmated males lived longer than males which had been allowed to mate several times. The longevity and developmental period were shorter in May and June but increased appreciably during winter months. The normal developmental mortality of 10-15% during optimum conditions of 30°C and 70% RH increased with a decrease in relative humidity. The sex ratio (male:female) was approximately 1:2.7.