Influence of weather factors on incidence of fruit borer complex (Earias vittella Fabricius and Helicoverpa armigera Hub.) on okra

Abstract

An experiment was conducted to study the seasonal incidence of fruit borer infesting okra (cultivar – Bhindi No.10) during post-kharif (2015 & 2016) and pre-kharif (2016 & 2017) season at Uttar Banga Krishi Viswavidyalaya, Pundibari, West Bengal, India. The result revealed that the activity of fruit borer was found more during pre-kharif season in comparison to post-kharif season. The peak incidence of fruit borer (28.43%/plant) was observed in 45SW during post-kharif season and (33.22%/plant) in 20SW during pre-kharif season. Weather play an important role in incidence of fruit borer in both post-kharif and pre-kharif seasons under study. During post-kharif season, fruit borer (bored fruit %) had significantly negative correlation with maximum and minimum temperature of all weeks. During pre-kharif season the maximum temperature of current week, minimum temperature of all the week, evening RH of current week, 1-lag week and total rainfall of 2-lag week had positively significant influence on fruit borer incidence.