Management of Meloidogyne incognita infecting frenchbean through seed coating with chemicals

All the four chemicals viz., carbofuran, oncol, posse and acephate performed significantly better over the untreated check both in respect of increasing plant growth and reducing nematode infestation. Higher concentrations of all the chemicals were more effective. Among the chemicals, carbofuran 3% a.i. (w/w) was found to be most effective in suppressing the nematode activity and providing better plant growth of frenchbean and carbofuran 2%. Though, acephate performed better than oncoland posse at 1% a.i. (w/w) seed treatment, it was found to be less effective as compared to oncol and posse at both the higher concentrations (2 and 3% a.i. w/w). The treatments did not show any phytotoxic effect on frenchbean plants. The higher doses of carbofuran, oncol and posse exhibited least number of root-knot galls. The number of root-knot galls ranged from 7.50 with carbofuran (3%) to 49.75 with acepthate (1%) asagainst 113.0 in untreated check. The gall formation by M. incognita was significantly influenced by the effect of chemicals used. It was observed that lesser the number of galls, better was the crop growth. The chemicals prevented the nematodes to multiply as a result, the growth, vigour and yield of the crop increased.