Studies on the egg-parasitoid, Uscana lariophaga Steffan (Hymenoptera: Trichogrammatidae), with reference to its role in the assessment of cowpea losses due to Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) in Egypt.
Uscana lariophaga, which is recorded for the first time in Egypt, parasitizes eggs of the bruchid Callosobruchus maculatus. Laboratory studies indicated that mated adults of the parasitoid lived for 7.0 and 6.0 days for males and females, respectively, at 25±1°C and 65% RH. The female copulated once, whereas the male did so up to four times. The maximum parasitization of the eggs took place within the first 24 h of egg-laying and declined thereafter. The parasitoid completed its development inside the egg in 6.3 days at 25±1°C and 65% RH. Mated and unmated females laid 40.5 and 42.7 eggs on average in their lifespan, of which 77.4 and 65.2% emerged as adults, respectively. Under field conditions, a sophisticated technique for the assessment of cowpea crop losses and loss prediction was used.