Vol. 11, Special Issue 12 (2022)

The experimental study was carried out under field condition to observe the seasonal incidence and natural enemy population during 2017 to 2018. The major sucking pest observed were viz., Aphids (Aphis craccivora Koch), Whitefly (Bemisia tabaci Gennadius), thrips (Megaleurothrips usitatus Bagnal) and leafhopper (Empoasca fabae Harris) out which the most abundant insect pest observed were aphids. In seasonal incidence it was observed that aphid population reached to a peak level of 3.85 aphid index on the 10^th WAS. Further the thrips and whitefly population reach its peak level of 7.38 and 9.25 per 3 leaves respectively, on the 10^th WAS, which coincided with the peak flowering period of French bean. In correlation with weather parameters of the pest population both aphids and thrips showed (r = -0.544* and r = -0.503*) negatively significant correlation with rainfall parameters. The natural enemies observed were spiders, species of ladybird beetle like Coccinella septempunctata L., Chilomenes sexmaculata Fabr, and robber fly (Dysmachus trigonus).