SEASONAL INCIDENCE OF THRIPS, THRIPS TABACI LINDEMAN AND OCCURRENCE OF ASSOCIATED NATURAL ENEMIES ON ONION (ALLIUM CEPA L.)
Department of Entomology, Rajasthan College of Agriculture (MPUA&T), Udaipur, Rajasthan, 313001
M. A. MANSURI, N. GAUTAM, K. SINGH, R. SWAMINATHAN AND H. K. JAIN
An experiment was conducted at Rajasthan College of Agriculture, Udaipur during rabi 2013-14 to study the seasonal incidence of onion thrips. The incidence of onion thrips initiated on 4th SMW and gradually increased towards maturity and reached its peak in 13th SMW (35.1 thrips/ plant). The population of thrips had significant positive correlation with maximum (r = 0.81), minimum (r = 0.70), and mean atmospheric temperature (r = 0.79); while maximum relative humidity (r = -0.75) and mean relative humidity (r = -0.72) had significant but negative correlation with the population of thrips. The population of Cheilomenes sexmaculata (Fabricius) peaked during 12th SMW and had a highly positive and significant correlation with the population of thrips (r = 0.97).