EFFICACY AND COMPATIBILITY FOR FENAMIPHOS AND EPTC APPLIED IN IRRIGATION WATER FOR NEMATODE AND WEED-CONTROL IN SNAPBEAN PRODUCTION

A nematicide (fenamiphos) and a herbicide (EPTC) were injected into a sprinkler irrigation system separately and as tank mixtures and applie d in 25.4 kl water/ha for nematode and weed control on snapbean. There were no differences (P = 0.05) between methods of injection of fenami phos + EPTC on efficacy or crop response. The root-gall indices of cul tivars Eagle and GV 50 were lower in fenamiphos-treated plots than tho se treated with EPTC alone and untreated plots. The yield and crop val ue were greater (P = 0.05) for cultivars Eagle and Nemasnap than GV 50 . Fenamiphos 4.48 kg a. i./ha + EPTC 3.36 kg a, i./ha controlled root- knot nematodes, Meloidogyne incognita, ring nematodes, Criconemella or nata, and weeds, and resulted in greater plant growth, yield, and crop value than those from untreated plots. No benefits (P = 0.05) resulte d from treatment with fenamiphos at 6.72 kg a. i./ha + EPTC treatment compared with fenamiphos at 4.48 kg a. i. + EPTC.