Effect of Abiotic Factors on the Population Dynamics of Thrips, (Thrips tabaci Lind.) on Onion Crop

摘要

The activity of thrips on onion were gradually increased from 4,h standard week of January and continued up tol 8,h standard week of May, 2012 with maximum thrips population (63.30 thrips/plant) was recorded during 15* standard week of April when thecorresponding maximum, minimum temperature and relative humidity at 7 and 14 hrs during the period were 31.00, 20.50°C 92.10 and 59.40 percent. The maximum temperature showed positive influence on thrips population (r=0.926), while minimum temperature and relative humidity at 7 hrs showed significant negative effect (r= -0.658 and -0.686, respectively).