The effects of aldicarb on soybean cyst (Heterodera glycines) and root-knot (Meloidogyne incognita and M. arenaria) nematode populations, early season insect pests and soybean (Glycine max) yield were evaluated in five field experiments in northern and southern Alabama. Aldicarb significantly (P = 0.05) reduced nematode populations in only two cases: M. arenaria in Centennial soybean in the Wiregrass site and M. incognita in Bedford soybean in a Tennessee Valley site. No significant difference (P = 0.05) in mean percentage main stem or petiole girdling by threecornered alfalfa hopper (Spissistilus festinus) or in mean number of plants damaged by lesser cornstalk borer (Elasmopalpus lignosellus) occurred among treatments in any experiment. Soybean yields were significantly (P = 0.05) increased in only two cases: in the nematode susceptible Essex and Cobb cultivars planted in the Tennessee Valley and Gulf Coast sites, respectively. Unusually dry 1986 weather conditions may have reduced the activity of aldicarb.
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