Evaluation of some chemicals against root knot nematodes, Meloidogyneincognita

Twenty seven chemicals of different nature were screened for theirnematicidal potential against root knot nematodes in vitro. All the testchemicals showed nematicidal effect of varying degree on emergence of rootknot larvae from eggs. Among these maximum reduction (100%) in hatching wasobserved with Pyridin 3- aldehyde, 3-Methyl pyridium followed by Katrex (99%)and Oxalic acid (98%) after 144 h of exposure. All test chemicals exhibitednematicidal effects (mortality of nematode larvae) on root knot nematodes. Ofthese chemicals Oxalic acid, 3-Methyl pyridium, Katrex and T-26 were foundmore effective causing more than 90% larval death after 72 h of exposure.Similarly all test chemicals were found to inhibit penetration of nematodelarvae into tomato roots.