Fosthiazate Controls Meloidogyne arenaria and M. incognita in Flue-Cured Tobacco

M. P. Pullen

Abstract


The nematicide fosthiazate was evaluated over a 3-year period for management of Meloidogyne incognita race 3 (site 1) and M. arenaria race 2 (site 2) in flue-cured tobacco. Fosthiazate was applied broadcast and incorporated at rates ranging from 22 to 88 g a.i./100 m², and compared with the nematicides fenamiphos (67 g a.i./100 m²), 1,3-D (56.1 L/ha, 670 ml/100-m row), and an untreated control. Root-gall indices and leaf yields were averaged over the 3-year period. Root galling was negatively correlated in a linear relationship with fosthiazate application rate at sites 1 and 2. Leaf yields were positively correlated with fosthiazate application rate at site 1 and could be described by a quadratic equation. Leaf yields were greater at 33 and 88 g a.i./100 m² application rates (site 2) than the untreated control. Leaf yields in fosthiazate (88 g a.i./100 m²)-treated plots infested with M. incognita or M. arenaria were not different from plots fumigated with 1,3-D. Plants in plots with fosthiazate applied in a row band (1993) had a lower root-gall index than those in plots with the same rate of fosthiazate applied broadcast. Fosthiazate may provide an alternative to fumigation for control of M. incognita and M. arenaria.

Keywords


1,3-d; fenamiphos; fosthiazate; meloidogyne arenaria; meloidogyne incognita; nematicide; nematode; root-knot nematode; tobacco

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