Seasonal Incidence of Thrips a Potential Insect Vector of GBNV in Black Gram

Background: Present experiment was aimed to know the influence of weather on the incidence of thrips, a major sucking pest and potential vector of GBNV in blackgram. Methods: The incidence of thrips complex for consecutive three seasons (spring 2019-20, autumn 2020-21, spring 2020-21) have been recorded from 7 DAS, till to crop maturity and correlated with weather parameters. Result: The thrips population was observed in the field approximately after 14 DAS. Overall view of thrips incidence in blackgram was more during autumn 2020-2021 (17.35 mean no of thrips per plant) compared to spring 2019-2020 (10.6) and 2020-2021 (10.10). Thrips population has showed a highly significant positive correlation with maximum temperature (0.74), minimum temperature (0.75), as well as with mean temperature (0.819) during rabi 2019. During spring 2020-21 only maximum temperature has shown significant positive correlation, but minimum and mean temperatures have shown positive correlation without any significance. Whereas during autumn 2020-21 temperature has shown positive correlation without any significance. Across the three seasons relative humidity has shown insignificant negative correlation.