Research Papers: Response of Soybeans and Nematodes to At-Planting Applications of Fumigant and Nonfumigant Nematicides

Abstract

Three fumigant and two nonfumigant nematicides were applied at planting of 'Ransom' soybeans (Glycine max(L.) Merr.) to determine their efficacy in controlling Meloidogyne incognita (Kofoid and White 1919) Chitwood 1949, Paratrichodorus (N.) christiei (Allen, 1957) Siddiqi, 1973, and Helicotylenchus sp., and to determine the tolerance of the crop to the nematicides. In the first experiment, ethylene dibromide increased yields and controlled nematodes more effectively than DD and 1,3-D at 9.4, 18.7, 28.1 and 37.4 1/ha injected 20 cm deep, two chisels per row spaced 25 cm apart. In the second experiment, DD at 46.8, 65.5, and 93.5 1/ha and ethylene dibromide at 18.7 1/ha were about equally effective in increasing soybean yields and decreasing nematode populations. Treatments were not phytotoxic in either experiment. Root-knot indices of soybeans in plots treated with phenamiphos and aldicarb applied in the seed furrow and in an 18-cm-wide band a head of the planter presswheel were sign

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