author(s)
S Mahato and HP Misra

abstract
Field evaluation studies conducted in the experimental plots of Department of Entomology, College of Agriculture, Orissa University of Agriculture and Technology, Bhubaneswar in RBD during Kharif, 2016 and rabi, 2016-17 with 9 treatments replicated three times against the aphid (Aphis gossypii Glover) on cucumber revealed that the newer insecticide molecules tolfenpyrad, spinosad, cartap hydrochloride and chlorantraniliprole remained on par with the chemical check acephate as regards the superiority in suppressing aphid population/sq. inch (2.00–2.33) is concerned compared to other insecticides and control (9.33) at 15 days after spraying (DAS) during kharif, 2016. The same treatments recorded 65.49 to 78.56% reduction in aphid population over control. Contrary to this, only tolfenpyrad, chlorantraniliprole and acephate recorded significantly lowest aphid population/sq. inch (0.67–1.00) compared to other insecticides and control (4.88) at 15 DAS during rabi, 2016-17 registering 79.96 – 82.28% reduction in aphid population over control. The predatory lady beetle population/5 leaves remained on par with untreated control at 5, 10 and 15 DAS both during Kharif and rabi seasons in the tolfenpyrad, indoxacarb, flubendiamide, chlorantraniliprole, and spinosad treated plots signifying their harmlessness towards the natural enemy. On the other hand fipronil, cartap and acephate proved toxic to the coccinellid predators.