A replicated small plot test using various insecticide treatments was conducted on cotton Gossypium hirsutum. Insecticides or insecticide mixtures were applied to cotton plots when the cotton plants were approximately 11 nodes tall. Insect populations were very low and the fruit set on the top five nodes of the cotton was above 90 per cent. Differences were observed in the cotton aphid populations, Aphis gossypii Glover, among the plots with different insecticide treatment.