Progeny and Sex Allocation in the Aphid Parasitoid, Lysiphlebia mirzai, at Different Parasitoid-Host Ratios (Hymenoptera: Aphidiidae)
Tripathi, Rajeev Nayan; Singh, Rajendra
The objectives of this study are to evaluate the parasitism rate (np) and search rate (a') of the corn aphid parasitoid Lysiphlebia mirzai Shuja-Uddin 1975 (on the host Rhopalosiphum maidis Fitch 1856) as well as its sex allocation at different parasitoid-host ratios (R). Rising R increases np although the rate of multiplication (number of hosts parasitizedlQ, M) and a' (measured as Nicholsonian area of discovery) decreases with rising R implying the presence of mutual interference. The data furnish an insight into the number of parasitoids needed to suppress the estimated aphid population. Sex ratio of F 1 offspring is inversely related with R indicating the desirability of having less female parasitoids per unit of host material for generating more female progeny.