Effect of some organic oils and their cakes on the infectivity of root-knot nematode, Meloidogyne incognita affecting tomato.

Higher concentrations of organic oils of karanj, neem, mahua and castor proved effective in preventing larval penetration and gall production in the roots of tomato. Cakes of these plants also gave significant reduction in gall number. The bed cake treatment i.e. neem produced light infection while the infection produced by the dilution of oil with highest strength was negligible. Thus, treatment with oil was relatively more effective than soil treatment with cakes in controlling root-knot nematode infection.