Seasonal Incidence of Whitefly and Aphid on Tomato Crop at Tarai Region of Uttrakhand

Abstract

The present investigation was carried out during 2015-2016 at Vegetable Research center, G.B. Pant University of Agriculture and Technology, Pantnagar . The trial was conducted to know the seasonal population dynamics of whitefly and aphid in tomato (Lakshmi hybrid1) and their relation to weather parameters. The results found that incidence of the Bemisia tabaci occurred from 39 th standard meteorological week (SMW) 2015 to 7 th standard meteorological week. Maximum population of whitefly was recorded during first week of October with incidence upto the last week of May. Simple correlation worked out between the weather parameters and the population of Bemisia tabaci revealed that there was non-significant negative correlation with morning relative humidity, rainfall, sunshine hours, maximum and minimum temperature but significant negative correlation with evening relative humidity. However, wind velocity exhibited a positive non-significant correlation with whitefly population during crop season while the incidence of the aphid spp was noticed from 40 th standard meteorological week (SMW) 2016 to 7 th standard meteorological week 2016. Persistent high population was noticed from 40 th to 43 rd (SMW) Simple correlation worked out between the weather parameters and population of Aphis gossypii revealed that there was non significant positive correlation with maximum and minimum temperature and sunshine hour, while maximum relative humidity, wind velocity, rainfall and minimum relative humidity showed non significant negative correlation with aphid population during crop season 2015-2016.