Author(s):

S Jaya Prabhavathi, S Palanisamy and S Kuttalam

Abstract: Cotton (Gossypium hirsutum Linn.) is an important agricultural crop cultivated in India for more than 5000 years. It plays a pivotal role in our national economy, by providing livelihood for 60 million people. It suffers from the ravages of several insect and mite pests, right from germination to harvest, resulting in about 15 - 40 per cent yield loss. One of the major causes for low yield is the damage caused by sucking insect pests viz., aphid (Aphis gossypii Glover), leafhopper (Amrasca biguttula biguttula Ishida), thrips (Thrips tabaci Lind.) and whitefly, (Bemisia tabaci Genn.) in the early stages of crop growth. Acetamiprid is a novel, neonicotinoid insecticide having N-cyano acetamidine compound that provides excellent control of sucking pests. The compound has excellent systemic and translaminar activities and used against the control of sucking pests of cotton. Two field experiments - one each in summer and winter season were conducted at Tamil Nadu Agricultural University, Coimbatore to determine the harvest time residues of acetamiprid 20 SP. The different treatments included acetamiprid 20 SP @ 10, 20, 40 and 80 g a.i./ha and Pride 20 SP at 20 g a.i./ha were sprayed to determine the residues level in cotton lint, seed and oil and also in soil samples. The results revealed that acetamiprid 20 SP applied @ 10, 20, 40 and 80 g a.i./ha and Pride 20 SP at 20 g a.i./ha left residues at below detectable level in cotton lint, seed and oil at first, third and fifth harvest as well as in the soil sample collected at fifth harvest period in both the seasons. The interval between last spray and first harvest was 80 and 98 days in the field experiment I and II, respectively.

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