TRITROPHIC INTERACTION IN THE MANAGEMENT OF Helicoverpa armigera (Hubner) ON COTTON AND SUNFLOWER USING Chrysoperia carnea (Stephens)
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Date
2007-08-29
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University of Agricultural Sciences GKVK, Banglore
Abstract
The investigations on ovipositional preference studies indicated that when compared
across the different stages (Vegetative, flowering and boll formation ) the mean number of
egg laying by C. carnea in absence and presence of H. armigera was significantly highest on
DHH-543 and it laid significantly lower number of eggs on PA -255 and Abhadita. While
H. armigera laid significantly higher egg load on Sahana and least on OB -3-12 followed by
Abhadita. Among the different stages of cotton genotypes, C. carnea both in presence and
absence of H. armigera laid more number of eggs at flowering followed by boll formation
stage, while H. armigera also followed the similar trend in its egg laying pattern. When
compared across the stages of sunflower, the mean number of eggs laid by C. carnea in
absence and presence of H. armigera was significantly highest on KBSH-1 and Morden and it
laid least number of eggs on VRF-21 and DSF-2, whereas H. armigera laid significantly
lower number of eggs on VRF-21. Among the stages, C. carnea in absence and presence of H.
armigera laid more eggs at flowering stage followed by capitulum formation stage. H. armigera
also followed the similar trend in its egg laying pattern.
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