SCREENING OF SOME SUNFLOWER CULTIVARS AGAINST MELOIDOGYNE INCOGNITA ROOT-KNOT NEMATODE AND ITS CHEMICAL CONTROL

摘要

The resistance/susceptibility of five sunflower cultivars on the basis of number of galls indicated that none of the test cultivar was immune or resistant to Meloidogyne incognita root-knot nematode. However, on the basis of root knot index, cultivarSF-187 was categorized as moderately susceptible, cultivars Romania and Cargill-204 as susceptible and other two cultivars Suncross-843 and NK-212 as highly susceptible. When the efficacy of four chemicals i.e. Carbofuran, Rugby, Carbosulfan and Nimokilwas tested against M. incognita, it was found that Carbofuran and Rugby were the most effective in controlling the nematode. These two chemicals gave maximum reductions in number of galls and egg masses and significantly improved plant growth parameters. Nimokil was found to be least effective.