Trends in Biosciences

A green house study using artificial inoculations in earthen pots was made to ascertain the efficacy of three different chemicals viz. Carbofuran, Oncol, and Posse against root-knot nematode infecting green gram. The study revealed that all the chemicals applied either as soil drench or seed soaking were effective and superior to untreated control in reducing nematode population and gall index and in improving plant growth. The chemical Carbofuran showed better performance than that of Oncol and Posse. Seed soaking treatment registered slightly better plant growth in comparison to soil drench application. However, soil drench application of chemicals showed much efficacy in restricting nematode population and gall development. Higher concentration (0.1%) of chemicals appeared as the most effective than the lower concentration 0.05%). The number of bacterial nodules increased in all chemical treatments with a more stimulating effect at lower dosages.