author(s)
Jahar Lal Saha and Bulganin Mitra

abstract
Observation of different cotton pest species and their natural enemies have been made on Bacillus thuringiensis (Bt.) and non-Bacillus thuringiensis (non-Bt.) cotton plants in Tripura. Boll worm, Earias vitella Fabricius, Red cotton bug, Dysdercus koenigii (Fabricius) and cotton aphid, Aphis gossypii Glover were recorded from both Bt and non-Bt cotton plants, besides other pest species in non Bt. plants along with several natural enemies of cotton aphid. Altogether, 12 pest species and 9 natural enemies representing 7 predators and 2 parasites have been reported in this paper.