Compatibility of insecticide and fungicide combinations and their feeding toxicity against tobacco caterpillar, Spodoptera litura (Fab.) on soybean

The results showed highest feeding deterrence in terms of feeding inhibition (FI) in spinetoram 11.70 SC + (metiram 55 + pyraclostrobin 5 WG) at 15 d after I, II, and III spraying (90.73, 91.77, and 92.19%; MLAC = 0.28,0.26, and 0.25 cm², respectively) followed by indoxacarb 14.5 SC + (metiram 55 + pyraclostrobin 5 WG) (85.93, 86.20, and 86.94%; MLAC = 0.43, 0.44 and 0.43 cm², respectively). The least feeding inhibition was seen in indoxacarb 14.5 SC + (carbendazim + mancozeb 74 WP) (43.32, 45.30 and 38.52%; MLAC = 2.25, 2.25 and 2.73 cm², respectively) followed by indoxacarb 14.5 SC + hexaconazole 5 SC (67.81, 70.06 and 61.67%; MLAC = 1.09, 1.05 and 1.46 cm², respectively). The combinations of spinetoram 11.70 SC + (metiram 55 + pyraclostrobin 5 WG), and indoxacarb 14.5 SC + (metiram 55 + pyraclostrobin 5 WG) therefore, can be used as commercial formulations without any antagonistic effect on toxicity against S. litura and phytotoxicity to the soybean crop.