Combinations of Anhydrous Ammonia and 1,3-Dichloropropenes for Control of Root-Knot Nematodes in Soybean

Abstract

The efficacy of combination planting time treatments of anhydrous ammonia (NH) and 1,3-dichloropropenes (1,3-D) against species of Meloidogyne Goeldi was studied in two field experiments with Ransom soybean [Glycine max (L) Merr.]. One experiment was in a field infested with M. incognita (Kofoid & White) Chitwood and the other in a field with M. arenaria (Neal) Chitwood. NH was applied at 0, 56, and 112 kg N/ha alone and in combination with the Telone(?) II formulation of 1,3-D at rates of 0, 18.7, 37.4, and 56.1 l/ha. NH alone failed to reduce soil larval populations of M. incognita in soil but reduced numbers of M. arenaria when applied at the lowest rate. Factorial analysis of the larval data indicated no significant interaction between NH and Telone II treatments. A significant reduction in larval numbers in response to Telone II applications was detected for M. incognita when the data were considered independently of the effect of NH; the effect of Telone II on M. arenaria larva