Research Papers: Soybean Yield Losses Caused by Meloidogyne arenaria and Heterodera glycines in a Field Infested with the Two Parasites
Linear multiple regression analyses were performed on data from six soybean [Glycine max (L) Merr.] field experiments to determine the relation between yield and soil larval populations of race 3 Heterodera glycines Ichinohe and of Meloidogyne arenaria (Neal) Chitwood. The experiments were nematicide efficacy tests conducted in 1980 in South Alabama with Bragg soybeans in a field infested with both parasites. The tests comprised treatments with fumigants (DD, EDB), systemic nematicides (aldicarb, carbofuran, oxamyl, phenamiphos) and other treatments in which combinations of anhydrous ammonia and a nitrification inhibitor (ethazole) were used to reduce nematode populations. Each experiment consisted of 14 treatments replicated eight times. A total of 672 sets of observations (yield: H. glycines: M. arenaria) were thus available for the study. Results indicated that larval numbers of M. arenaria and H. glycines were significantly and negatively related to yield but the the effect of H.
Population Dynamics; Modelling; Nematode Control; Pest Management; Threshold Levels; Root-Knot Nematodes; Cyst Nematodes