SCREENING OF DIFFERENT BT COTTON (GOSSYPIUM HIRSUTUM L.) GENOTYPES AGAINST SUCKING AND BOLLWORM COMPLEXES

M. H. Khan, N. Ahmad, M. Tofique

Abstract


Host plant resistance can play an important role in Integrated Pest Management (IPM) against insect pests. Relative infestation on five Bt transgenic cotton varieties/genotypes (IR-443, IR-FH-901, IR-448, IR-1524 and IR-1513) was investigated against sucking complex (jassids, thrips and whiteflies) and bollworms [pink (Pectinophora gossypiella) and spotted (Earias spp.) bollworms] during 2 consecutive years (2009 and 2010). Results reflected that IR-443 proved to be the most successful genotype rendering lowest infestation of jassids, thrips and whiteflies in both years as compared to other Bt cotton genotypes followed by IR-FH-901. Percent infestation by pink and spotted bollworms remained below Economic Threshold Level (ETL) and differed non significantly in all transgenic cotton genotypes. Highest yield was recorded from IR-443 which was significantly higher than IR-1513 and statistically at par with other three Bt cotton. Overall performance of IR-443 was found excellent followed by IR-FH-901. Thus, the latter two Bt transgenic cotton varieties/genotypes should be considered as an important tool to help in managing certain pest populations in an economically viable and environmentally safe manner.

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