Seasonal incidence of grapevine thrips (Scirtothrips dorsalis Hood), along with its natural enemies

The present study entitled “Seasonal incidence of grapevine thrips (Scirtothrips dorsalis Hood) along with its natural enemies” was undertaken at Onion and Grape Research Station Pimpalgaon Baswant., (Maharashtra) - 422209 during rabi 2024-25. The population dynamics of Scirtothrips dorsalis Hood on grapevine were studied in relation to various weather parameters, recorded weekly as per the Standard Meteorological Week (SMW). Initial incidence was noted during the 44th SMW (October 29th to November 4th) with an average of 1.2 thrips per shoot, while peak incidence occurred in the 50th SMW (December 10th to 16th) with 18.6 thrips per shoot. During this peak period, the maximum and minimum temperatures were 28.1°C and 10.12°C, respectively, with morning and evening relative humidity recorded at 89.5% and 69.4%. Correlation analysis revealed a significant negative relationship between thrips incidence with maximum temperature (r = -0.560**) and significantly positive correlation with evening relative humidity (r = 0.500*). Remaining weather factors showed non-significant correlation.