Effects of host’s Helicoverpa armigera Hubner larval age on the area of discovery of the parasitoid Campoletis chlorideae Uchida
Keywords:
area of discovery, killing power, Helicoverpa armigera, Campoletis chlorideae, Mutual interferenceAbstract
The area of discovery and killing power (K-value) of the parasitoid Campoletis chlorideae Uchida with interaction between different larval age of the host Helicoverpa armigera (Hübner) were studied at different parasitoid and host densities. The area of discovery of the parasitoid decreases linearly while the killing power (K- value) increases significantly with the increase of parasitoid. However, when the host density increases both the area of discovery and killing power (k-value) increases up to 16 hosts and thereafter they decrease. The area of discovery and killing power (K-value) in maximum in 2nd instar followed by 3rd instar, 1st instar and 4th instar larvae of the host H. armigera. As the parasitoid density increases mutual interference increases, which cause a reduction in an individual searching efficiency
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