Surveillance of pod borer, Helicoverpa armigera (Hubner) and its natural enemies on chickpea at Sahaspur Lohara blocks

Abstract

Experiments on incidence of Helicoverpa armigera and its natural enemies in chickpea was studied during 2016-17 and 2017-18 at the area of Kabirdham districts of Chhattisgarh at blocks viz., sahaspur-Lohara and in each block fields were selected during 2016-17 and 2017-18. On the basis of pooled mean various abiotic parameters viz., the population of H. armigera larva Showed non-significant and negative correlation with maximum temperature (0C) (r = - 0.448) but minimum temperature (0C) (r = - 0.540*) negative significant correlation with H. armigera and regression line was worked out for no. of H. armigera larvae Y1= -0.274 X2+ 5.940 R2 0.29. Rain fall (r = 0.204), wind velocity (r = - 0.329) and sunshine hours (r = 0.013) are positive non-significant but relative humidity (r = 0.845**) highly positive significant correlation with H. armigera larva population and regression line was worked out for no. of H. armigera larvaeY1 = 0.143 X3 - 8.564, R2 0.71. Pooled mean data, the ento-pathogenic virus NPV infected larvae was Showed non-significant and negative correlation with maximum temperature (0C) (r = - 0.506), minimum temperature (0C) (r = - 0.473) and sunshine hours (r = 0.123). Rain fall (r = 0.231), wind velocity (r = 0.424) positive non-significant correlation was observed but morning relative humidity (r = 0.812**) highly positive significant correlation with NPV infected larvae and regression line was worked out for no. of NPV infected larvae Y2 = 0.011 X3 - 0.752, R2 0.71. Basis of pooled mean data, the larval parasitoid, Campolestis chlorideae was showed non-significant and negative correlation with maximum temperature (0C) (r = - 0.430), minimum temperature (0C) (r = - 0.511) and Sunshine hours (r = - 0.108). Rain fall (r = 0.003), Wind velocity (r = 0.435) are non-significant and positive correlation but Relative humidity (r = 0.746**) is highly significant positive correlation and regression line was worked out for no. of Campolestis chlorideae parasitoid larvae Y3 = 0.016 X3- 0.990, R2 0.55.