Effect of soil amendment with green manures on population dynamics of Helicotylenchus spp. and Hoplolaimus spp

Five green manures i.e. cowpea (Vigna unguiculata), sesbania (Sesbania aculeatu), mungbean (Vigna radiata), sunnhemp (Crotalaria juncea) and clusterbean (Cyamopsis tetragonoloba) were tested at three doses @ 100, 200 and 300 quintalha against two plant parasitic nematodes Helicotylenchus spp. and Hoplolaimus spp. Except crotalaria, growing of all green manures for 45 days resulted in increase of population of phytonematodes. However, incorporation of green manures in soil resulted in a decrease in the population of plant parasitic nematodes to various extent as compared to control. Crotalaria was found to be the most effective of all green manures tested in reducing the population of Helicotylenchus spp. and Hoplolaimus spp.