Research Papers: Control of Root-Knot Nematodes on Peanuts with Planting Time and Postemergence Applications of Ethylene Dibromide and an Ethylene Dibromide-Chloropicrin Mixture

Abstract

Field studies were conducted during 1977 and 1978 to determine the feasibility of using ethylene dibromide (Soilbrom 90(?) EC) or an ethylene dibromide-chloropicrin mixture (Terr-O-Cide(?) 72-27) as substitutes for DBCP (1,2-dibromo-3-chloropropane) for control of root-knot nematodes on the Florunner cultivar of peanut (Arachis hypogaea L.). Results from a field heavily infested with root-knot nematodes indicated that planting time applications of Soilbrom 90 EC at 9.35 L/ha were as effective as applications of DBCP at the same rate but that higher rates of Terr-O-Cide 72-27 were needed to obtain the same degree of nematode control. Maximal yield responses and best control of root-knot nematode were obtained with rates of 18.70 L/ha with either of the two ethylene dibromide formulations; rates higher than 18.70 L/ha did not produce additional benefits. When Soilbrom 90 EC was applied postemergence at rates of 9.35-37.41 L/ha at the mid-bloom stage of growth, no phytotoxicity was dete