Ecology, Environment and Conservation Paper

POPULATION DYNAMICS OF THRIPS (THRIPS TABACI LIND) ON ONION IN RELATION TO ABIOTIC FACTORS

Paidi Satyanarayana and P. P. Singh

Abstract

The experimental findings of two years crop seasons i.e; 2013-14 and 2014-15 revealed that the activity of thrips on onion gradually increased from 6th standard week of February and continued up to17th standard week of April, with maximum thrips population (69.77 thrips/plant) was recorded during 14th standard week of April when the corresponding maximum, minimum temperature and relative humidity at 07 and 14 hrs during the period were 33.50, 18.50 oC, 91.95 and 56.70 percent respectively. The maximum temperature and minimum temperature showed positive influence on thrips population (r=0.687 and 0.496), relative humidity at 7 hrs and rainfall showed significant negative effect (r=-0.638 and -0.506, respectively).