Endured efficacy of selective insecticides against rose thrips under tropical polyhouse condition

Abstract

A polyhouse trial was conducted on four cut rose cultivars viz., Top Secret, Solaire, Sovereign and Avalanche with newer insecticide molecules under the tropical climatic condition to identify the endured efficacious compounds against phytophagous thrips. Experimental results revealed that in all four cultivars, imidacloprid 17.8 SL @ 0.5 ml/lit produces statistically significant long-lasting fruitful effects by controlling thrips population (57.52% to 92.66% reduction over control), followed by spinosad 45 SC, clothianidin 50 WDG, and thiamethoxam 25 WG proved their efficacy. Treatments, days after spray, and their interaction effects reveal statistically significant difference in all four cultivars. Reduction of thrips over control was realized with all the treatments ranged between 49.78% - 95.52 % in Top Secret (V1), 53.18 % - 95.72 % in Solaire (V2), 58.08 % - 94.21 % in Sovereign (V3) and 52.03 % - 90.92 % in Avalanche (V4).