Vol. 11, Special Issue 5 (2022)

Author(s):
Bishana Ram, VS Acharya, Renu Choudhary and Mahendra

Abstract:
The field experiments was carried out on seasonal incidence of whitefly, Bemisia tabaci on Bt cotton in relation to weather parameters at the Research farm College of Agriculture, Swami Keshwanand Rajasthan Agricultural University Bikaner, (Rajasthan) during Kharif, 2018. The occurrence of whitefly, Bemisia tabaci on Bt cotton was started in the 26^th standard meteorological week which was last week of June and remained until 44^th standard meteorological week which was first week of November. Initially, the population of whitefly, B. tabaci was recorded low but gradually increased week after week and attained to its peak in 38^th standard meteorological week, which was the third week of September. After its peak population, the population of whitefly, B. tabaci was declined gradually week after week and after the 44^th standard meteorological week which was first week of November there is no population occurred on Bt cotton. The maximum temperature showed non-significant positive correlation with incidence of whitefly, B. tabaci on Bt cotton. The minimum temperature showed non-significant negative correlation of with incidence of whitefly, B. tabaci on Bt cotton. Morning relative humidity showed significant negative correlation with incidence of whitefly, B. tabaci on Bt cotton while, evening relative humidity showed non-significant negative correlation with incidence of whitefly, B. tabaci on Bt cotton. Rainfall showed non-significant negative correlation with incidence of whitefly, B. tabaci on Bt cotton. These findings are useful for effective pest management in Bt cotton crop.