Abstract
ABSTRACT Studies were taken up to monitor the population of sucking pests as well as boll damage in commercially released Bt cotton entries. In the present study it was found that the jassid population was almost negligible (< one per three leaves) both in Bt as well as non Bt cotton hybrids. In five Bt cotton hybrids (JKCH 1947, RCH 317, NCEH 6, Ankur 2534 and MRC 6301) it was less than that of non Bt cotton hybrid. However, whitefly incidence was more in all Bt cotton hybrids than that of the non Bt cotton hybrid, which may be due to reduction in the spray of chemical insecticides or the negligible infestation of bollworms. The bollworm damage in the current experiments revealed almost nil damage to the bolls in Bt cotton compared to non Bt cotton hybrid. The seed cotton yield in 12 out of 13 Bt cotton hybrids were more than that of non Bt cotton hybrid. This reveals the superiority of Bt cotton hybrids in terms of yield.
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