Compatibility of certain combinations of insecticides and herbicides and their feeding toxicity against tobacco caterpillar, Spodoptera litura (Fabricius), on soybean

Results exhibited significantly highest feeding deterrence vis-a-vis mean leaf area consumed and feeding inhibition in (imazamox + imazethapyr) + flubendiamide (0.04, 0.04, and 0.04 cm²; and 98.41, 97.83, 98.09%, respectively) at 3 DAF of 10 d after I, II, and III spray followed by combinations of emamectin benzoate with metribuzin > quizalofop ethyl > imazethapyr > imazamox + imazethapyr; and lowest in quizalofop ethyl + (novaluron + indoxacarb) (2.06, 2.04, and 1.97 cm²; and 44.56, 34.22, and 38.95%, respectively). All 24 combinations were non-phytotoxic even 60 DAS. Treatments were physically compatible without sedimentation and chemically stayed in saline pH with TDS <500 mg/L. Quizalofop ethyl, imazethapyr, (imazamox + imazethapyr), and metribuzin combinations with emamectin benzoate and flubendiamide deterred feeding until 10 days of the respective sprays. Whereas, novaluron + indoxacarb and spinetoram in combination with quizalofop ethyl, propaquizafop, metribuzin, and chlorimuron ethyl were significantly ineffective at P = 0.05 in protecting the damage by S. litura.