Seasonal incidence of sucking insect pests in brinjal and their natural enemies in gird region of Madhya Pradesh, India

A field experiment was conducted at Entomology Research Farm, RVSKVV, College of Agriculture, Gwalior (M.P.) to find out the seasonal incidence of sucking pests of brinjal and their natural enemies and its correlation with weather parameters. The incidence of aphid, jassid and whitefly were started during 43rd SMW and attained their peaks population during 8th, 1st and 1st SMW, respectively. While the activity of Coccinella spp. was started from 2nd SMW and reached its peak population during 8th SMW. Correlation studies revealed that the aphid population was correlated positive significantly with morning and evening relative humidity and rainfall (r= 0.34, r= 0.72 and r= 0.41, respectively). Significant positive correlation was observed between population buildup of jassid and whitefly with morning relative humidity (r= 0.49 and r= 0.51, respectively). The correlation studies between natural enemies and weather parameters revealed that the morning and evening relative humidity and rainfall were significantly positive correlated (r= 0.49, r= 0.70 and r= 0.22, respectively), with Coccinella spp. population while maximum and minimum temperature and evaporation were found to be negatively correlated (r= -0.60, r= -0.33 and r= -0.43, respectively). Population of Coccinella beetle was associated significantly positive with aphid population (r= 0.88).