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Insect pests are the major problem in cotton production. Among the pests, bollworm complex is very serious throughout the country and it poses a serious threat to cotton cultivation in many agro- ecological zones. The present study was undertaken to evaluate the efficacy against the spotted bollworm, Earias vittella (Fab.) which is predominant in most of the cotton growing areas all over the world. The experiment was conducted with neonates and third instar of the spotted bollworm on squares and bolls of Bt cotton cultivars namely MECH 162 Bt ,MECH 184 Bt, RCH2 Bt along with check varieties MCU7 and SVPR3.The percentage mortality on squares and bolls under laboratory conditions was observed. On square basis, at 65 DAS, RCH2 Bt recorded (96 %) a higher percentage mortality followed by MECH 162 Bt (93.33 %) and MECH 184 Bt (89.33 %) compared to their NBt counterparts and check varieties MCU7 and SVPR3. Significantly higher percentage mortality was observed in Bt hybrids at 80, 95 and 110 DAS. On boll basis, RCH2 Bt recorded a higher percentage mortality, 29.41 and 33.00 percent followed by MECH 162 Bt (22.08 and 22.07 %) and MECH 184 Bt (18.33 and 11.07 %) at 128 and 143 DAS respectively compared to their NBt counterparts and check varieties. The highest per cent mortality was recorded in RCH2 Bt followed by MECH 162 Bt and MECH 184 Bt on square and boll basis. All the Bt varieties recorded higher per cent mortality compared to their check varieties. It was concluded that RCH2 Bt (93.67% and 29.37%) was more effective against the spotted bollworms, E. vittella compared to the other cultivars.
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