Population Dynamics of Thrips (Thrips tabaci Lindeman) on Onion in Relation to Different Weather Parameters Patel H. C.*, Patel J. J. Main Vegetable Research Station, Anand Agricultural University, Anand, 388 110 *e-mail: agri.himanshu87@gmail.com
Online published on 13 January, 2016. Abstract Population dynamics of Thrips tabaci Lindeman in onion, Allium cepa Linnaeus was carried out at Main Vegetable Research Station, AAU, Anand, Gujarat during the year 2009–10. The population of thrips initiated after 1st week after transplanting i.e. first week of December and remained in field till to crop matured. It was increased gradually and attained first (7.52 thrips/plant) and the highest peak (15.40 thrips/plant) during 4th week of January and 2nd week of March, respectively. Then after, the population declined till to maturity of the crop. Overall, the incidence of thrips was higher (> 5 thrips/plant) at 6th (2nd week of January) to 16th (4th week of March) week after transplanting. The correlation with weather parameters studies indicated that the population of thrips had significant positive correlation with Bright Sunshine Hours (0.50809**), Maximum Temperature (0.57823**), Mean Temperature (0.49487*), Morning Vapour Pressure Deficit (0.86561**), Evening Vapour Pressure Deficit (0.63952**), Mean Vapour Pressure Deficit (0.79345**) and Wind Speed (0.44195*). However, Morning Relative Humidity (−0.91735**), Evening Relative Humidity (−0.72043**), Mean Relative Humidity (−0.87602**) and Evening Vapour Pressure (−0.63804**) had significantly negatively correlated with the population of thrips. Top Keywords Allium cepa, Bright Sunshine Hours, population, Relative Humidity, Temperature, Thrips tabaci, Vapour Pressure Deficit, weather parameters, Wind Speed. Top |