The over reliance on, and widespread use of, synthetic insecticides has led to resistance, increased concerns about the long term environmental impacts, and public health issues (Smart et al 1994). These issues of cost, efficacy, resistance and environmental impacts have led to the increased implementation of Integrated Pest Management(IPM) strategies. Crop plants including cotton can produce chemicals that can modify the behaviour of insects, particularly pests (Tinsworth 1990). The use of behaviour modifying compounds such as feeding deterrents, oviposition deterrents, attractants, repellents etc. , which can reduce insect feeding or egg lay without killing pests, has intuitive appeal because such compounds can be used in IPM to reduce synthetic insecticide sprays. In addition they are safer to non-target organisms.