Vol. 9, Special Issue 10, Part P (2025)

The present investigation was conducted during Rabi 2023-24 and 2024-25 at the Research Farm, College of Agriculture, RVSKVV, Gwalior, to study the seasonal incidence of thrips and to evaluate thirty-five onion genotypes for their reaction to infestation. Thrips population ranged from 2.59 thrips per plant (51^st SMW) to a peak of 42.91 thrips/plant (8^th SMW), with maximum temperature showed a significant positive correlation (r = 0.547), while relative humidity exhibited a suppressive effect during rabi season of 2023-24. Significant variation among genotypes allowed their categorization into four resistance groups. Out of 35 genotypes, 5 genotypes viz., 1783, Bhima Safed, 1769, Bhima Raj and1774 were classified as highly resistant (9.61 to 10.19 thrips/plant). fourteen genotypes, GL-3, 1772, GL-1, 1770, Bhima Super, Bhima Kiran, Arka Pragati, Bhima Light Red, Bhima Shakti, GL-2, N-53, Bhima Shweta, Bhima Dark Red and Bhima Red were grouped as resistant (10.30-12.06 thrips/plant). Nine genotypes, such as W-125, Arka Kalyan, W-504, W-361, W-401, 1771, 1768, W-344 and 1773 were susceptible (12.32-13.92 thrips/plant), while Seven genotypes i.e., Bhima Shubhra, W-355, W-507, N-2-4-1, W-500, W-085 and W-043 were rated as highly susceptible (14.20-16.45 thrips/plant). Based on these findings, Genetic resistance reduced thrips infestation; genotypes 1783 and Bhima Safed offer potential for breeding and integrated pest management.