Seasonal incidence of leaf webber and capsule borer, Antigastra catalaunalis (Dup.) on sesame in relation to abiotic factors

Abstract

A field study on seasonal incidence of leaf webber and capsule borer, Antigastra catalaunalis (Dup.) on sesame was carried out at research farm College of Agriculture, Bikaner (Rajasthan) during Kharif, 2019. The incidence of A. catalaunalis initially observed from 33rd standard meteorolgical week (SMW) with the population of 1.01 larvae per 5 plants. The larval number reached maximum on 37th standard Meteorological week with the population of 6.40 larvae per 5 plants. The correlation between occurrence of A. catalaunalis and predominant weather factors revealed that both maximum (r=0.642) and minimum temperature (r=0.534), had significant positive correlation whereas, relative humidity during morning (r=0.363) and evening (r=0.220) had non-significant positive correlation with A. catalaunalis. The rainfall (r -0.363) had shown negative correlation with larval incidence. Pod infestation initially observed on 36th standard Meteorological week with 12.12 per cent pod damage and the pod damage gradually increased reached to its peak in the 38th standard Meteorological week with 17.07 per cent.