Through field trials conducted in three consecutive seasons, Kharif, Rabi 1979-80 and Kharit 1980, in gains yields, due to insect pest control at different crop phases, were estima- ted. Three different insecticidal schedules consisting of carbofuran followed by quinalphos or monocrotophos and their combinations were evaluated for their efficacy, importance and economical value. The gain when protected at reproductive phase (P,) ranged from 20. 209% over control while when protected at maturity (P.) the gain observed was 25 to 97% Protecting the crop only at tillering phase (P) was found uneconomical. The monetary loss varied from Rs. 284 to 782 per hectare, Additional gains have been realised, when P, was either preceded by P, or followed by Ps. In Rabi season, P, assumed as much importance as P, but either of the two only was economically feasible,
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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