昆虫学、鳥類学、爬虫類学: 現在の研究
オープンアクセス

概要

Seasonal Incidence of Pink Bollworm Pectinophora Gossypiella (Saunders) in Bt Cotton

RB Dake*, CB Latpate, PR Zanwar

An investigation was undertaken to study the seasonal incidence of major sucking pests in Bt cotton during Kharif 2018 and 2019 at research farm of Department of Agril. Entomology, College of Agriculture, V NMKV, Parbhani. The results revealed that the The pheromone trap catches ranged from 03.00 to 125.00 male moths per trap per week during Kharif 2018, while it was 01.00 to 86.00 male moths per trap per week during Kharif 2019. The peak of pheromone trap catches was observed during 51st and 47th MW in 2018-19 and 2019-20, respectively. The rosette flowers in Bt cotton ranged from 3.65 to 17.25 per cent in Kharif 2018. Corresponding values during Kharif 2019 was 2.14 to 29.85 per cent. The peaks of rosette flowers due to pink bollworm were detected during 46 th and 44th MW in 2018-19 and 2019-20, respectively. It was found that, 5.00 to 40.00 per cent green boll damage was observed during Kharif 2018. Corresponding values for Kharif 2019 were 1.67 to 85.00 per cent in Bt cotton. The peak of per cent green boll damage was reported during 47th and 48th MW in 2018-19 and 2019-20, respectively. Pink bollworm larval population per 20 green bolls in Bt cotton ranged from 2.00 to 21.00 during Kharif 2018, although during Kharif 2019 it was 2.00 to 40.00. The peak of PBW larval population per 20 green bolls was observed during 46th and 40th MW in 2018-19 and 2019-20, respectively. Per cent locule damage in green bolls ranged from 1.23 to 55.56 per cent during Kharif 2018, however during Kharif 2019 it ranged from 1.25 to 62.50 per cent. The peak of per cent locule damage in green bolls was observed during 46th and 47th MW in 2018-19 and 2019-20, respectively. Seasonal incidence of moth catches, larval population, green boll damage, rosette flowers and locule damage due to pink bollworm was more in 2019 than 2018 due to variation in weather parameters.