Abstract

                                Studies were conducted to evaluate spirotetramat 150 OD as foliar application for its bioefficacy against the cotton aphid Aphis gossypii (Glover) in Tamil Nadu Agricultural University, Coimbatore during 2007. Three field experiments were conducted in farmers field locations in Coimbatore and Erode districts. The results of the studies revealed that spirotetramat 150 OD at 75 g a.i./ha was highly effective in checking the population of aphids and was on par with the standard check, imidacloprid 200 SL at 25 g a.i./ha. The spirotetramat 150 OD @ 75 g a.i./ha treated plots registered a population of 7.0, 3.3 and 0.9 aphids/ 3 leaves in the first, second and third trials respectively, while the untreated check in the respective trials registered a population of 335.8, 58.6 and 17.2 aphids/ 3 leaves. All the spirotetramat treatments also resulted in increased seed cotton yield under field conditions.

Key words : Spirotetramat 150 OD - cotton - aphids- bioefficacy