PJB-2005-43
RESISTANCE OF DIFFERENT BASMATI RICE VARIETIES TO STEM BORERS UNDER DIFFERENT CONTROL TACTICS OF IPM AND EVALUATION OF YIELD
RASHID A. KHAN, JUNAID A. KHAN, F. F. JAMIL AND M. HAMED
Abstract
Studies were conducted using five Basmati rice varieties to evaluate the chemical, biological control of rice stem borers and their infestation under natural conditions. The results revealed that rice stem borer infestation varied significantly among different Basmati varieties under chemical, biological and natural environmental conditions. In chemical control trial two chemicals viz., Lorsban 40 EC and Karate 2.5 EC were used at vegetative and panicle formation stage respectively in recommended doses. Results revealed that among varieties Basmati Super showed minimum infestation and Basmati 370 showed maximum infestation under chemical control. Biological control trial showed that Basmati Super had minimum infestation whereas other varieties showed same level of infestation. Yield analysis showed significant yield increase under chemical control over biological control. The varieties under natural conditions were ranked as Basmati Super > Basmati 2000 > Basmati 385 > Basmati Pak > Basmati 370. These results emphasized the need to carefully integrate the chemical and biological control tactics of IPM for rice
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