Effect of Two Organic Amendments and a Nematicide for Controlling Root-Knot Nematode (Meloidogyne incognita) on Country Bean

摘要

A field experiment was conducted with a view to test the efficacy of Poultry refuse (PR), Mustard oil cake (MOC) and the chemical nematicide, Furadan 5G (Carbofuran) for controlling root knot nematode, Meloidogyne incognita on country bean, Dolichos lablab var. BARI Shem-2. The root-knot nematode, M.incognita- infested soil was treated with PR (3 and 5 t/ha), MOC at the rates of 0.3 and 0.6 t/ha 3 weeks before seed sowing and Furadan 5G at the rate of 40 kg/ha was applied to soil before (at the same time of?) seed sowing of country bean. All the treatments performed well in reducing root-knot infestation and in increasing plant growth compared to control. The most effective treatment was PR @3 t/ha) + Furadan 5G @20 kg/ha followed by PR alone (5 t/ha). In the first year and the second year, gall index values were 9.50 and 9.33 galls in control, respectively. The severity of root-knot disease was reduced by 2.50 to 5.98 galls in the first year and by 3.93 to 6.60 galls in the second year. Fruit yield was increased over control by 21.93 to 46.37% with the maximum increase by PR (5 t/ha) in the first year and by 16.67 to 43.37% with the maximum increase by PR (3t/ha) + Furadan 5G (20 kg/ha) in the second year. The fruit yield of country bean was directly and linearly correlated with gall indices. Based on findings of the study, PR (3 t/ha) + Furadan 5G (20 kg/ha) and PR alone (5 t/ha) were noted as the most effective treatments to manage root-knot disease and to maximize yield of country bean.