Vol. 10, Special Issue 10 (2021)

Author(s):
Vijay Pal Meena, SK Khinchi, KC Kumawat and Suresh Choudhary

Abstract:
A field experiment was conducted to seasonal incidence of gram pod borer, Helicoverpa armigera (Hubner) and spotted pod borer, Maruca testulalis (Geyer) on greengram variety of IPM-02-03. The initial population of gram pod borer and spotted pod borer were 0.50 larvae/10 plants and 0.66 larvae/ 10 plants, respectively. The population gradually increased and reached the peak population was 8.50 larvae/10 plants and 9.66 larvae/ ten plants, respectively in 36th standard meteorological week, when the minimum, maximum temperature and relative humidity was 22.9 ⁰C, 30.5 ⁰C and 81.00 per cent, respectively. The correlation coefficient worked out that the infestation of gram pod borer and spotted pod borer on greengram crop showed that the negatively significant correlation with maximum temperature (r = -0.79 and -0.78), respectively. The population of spotted pod borer showed positive significant correlation with relative humidity (r = 0.71). The population of both insects showed non-significant correlation with minimum temperature, and rainfall at 5 per cent level of significance.