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Abstract


Studies On Comparative Efficacy Of Different Insecticides Used Against Cotton Thrips
The results of the studies on comparative efficacy of different insecticides used against cotton thrips thus obtained are summarized as under: The insecticides caused appreciable reduction of the thrips by about 66.9 to 80.5 % that were attacking the cotton crop, while in the control (no treatment) plots the thrips populati¬on increased by about 19.5 %. ¦ All the insecticides had shown a good kill of the pest upto first to three days after their spraying; however two insecticides Thiodan and Zolone D.T. had shown a persistant effect upto 14 days after spraying. Thiodan caused the highest reduction of the pest population 89.5 %. It was followed by Zolone D.T., Azodrin and Nuvacron causing reduction of 76.8 to 66.9 per cent respecti-vely. At first spraying, Azodrin and Nuvacron both as monocrotophos showed persistant ef-fect upto 14 days, registering about 84.0, 82.9, 30.5 and 87.7 and 83.3, 82.9, 90.5 and 87.7% reduction in the pest population respectively for one. three, seven and fourteen days after spraying. But at the second spraying both insecticides showed that 94.5, 76.3, 45.8, and 8.9 and 8.70, 70.1,34.5 and 1.1% reduction of the pest population respectively for one, three, seven and fourteen days after the spraying. At first spraying, Thiodan initiated reduction of 84.5% of the pest on one day and per-sisted to be 77.6% 14 th days after (he treatment. Similarly, Zolone D.T. was a little less than Thiodan showing initial reduction of 83.6 and the highly less effective 39.5%, at 14 days after spraying, than Thiodan showing the pest reduction to 66.7 %.

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