Vol. 2, Issue 6 (2017)
Effect of food plant on the numerical response of Campoletis chlorideae uchida (Hymenoptera: ichneumonidae), a parasitoid of Helicoverpa armigera (Hubner) (Lepidoptera: noctuidae)
Author(s): Ram Janam Dubey, Bhuwan Bhaskar Mishra, Maheshwar Singh, Afroj Zareen Athar, CPM Tripathi
Abstract: Effect of food plants viz. Cicer arietinumu, Pisum sativum and Cajanus cajan on the numerical response of Campoleris chlorideae, Uchida, parasitoid of Helicoverpa armigera (Hubner) were studied in present work. It was observed that with increase of parasitoid density, the amount of parasitisation increases non – linearly. The amount of parasitisation increasing significantly with the increase of parasitoid density and it was maximum in host, H. armigera, reared on C. arietinum followed by P. Sativum and Cajanus cajan food plants. ANOVA shows that the amount of parasitisation was significantly influenced between three selected food plants (F= 81.45, P< 0.01) as well as between 4 parasitoid densities (F = 170.77, P<0.01). The rate of multiplication was maximum with one parasitoid on 50 hosts as the parasitoid density increases the rate of multiplication decreases and this decrease was maximum in host reared on Cicer arietinum followed by host reared on Pisum sativum and host reared on Cajanus cajan food plants. ANOVA also revealed that amount of parasitisation is also significant between three selected food plants reared host (F= 7.02, P <0.05) and between 4 parasitoid density (F = 60.41, P< 0.01). It means this parasitoid C. chlorideae could play a role in the integrated control of H. armigera. The number of emerging offspring was maximum in C. arietinum reared host of 2nd instar than other food plants. (P. sativum and C. cajan) reared host. It is therefore, recommended that less number of parasitoid may be released at any recommended site for control purpose because the rate of multiplication is maximum with one parasitoid on 50 hosts.