Evaluate the impact of sowing periods on pink bollworm incidence in Bt Cotton

The present investigation was carried out at the research farm of Regional Research Station, Anand Agricultural University, Anand, during kharif 2020-21 and 2021-22 to evulate of impact of Bt cotton sown during different periods viz., first week of May, third week of May, first week of June, third week of June, first week of July, third week of July, and first week of August on incidence of pink bollworm. The results of experiment were revealed that Bt cotton sown during first week of May was found with minimum incidence of the pink bollworm larva as well as damage on squares, flowers, green boll, open boll and locule. Similarly, the minimum square damage, rosette flower and green boll damage was noticed in Bt cotton sown during third week of May. However, the highest seed cotton yield was recorded when Bt cotton sown at first week of June and third week of Jun whereas, the minimum seed cotton yield was recorded during first week of August.