Survey of Root Knot Disease in Rice-Wheat Cropping System Adopted under Different Resource Conservation Practices and Conventional Practice

Root knot disease was found widely distributed in rice-wheat cropping system at Ballia district of Eastern U. P. Of all the villages surveyed, Pur village recorded highest incidence of root knot disease. M. graminicola was found higher in rice crop as compared to wheat. Population of M. graminicola was comparatively higher in resource conservation practices than that in conventional practice. It was also found that nematode population was enhanced in conventional and resource conservation practice with residues as compared to practice without residues. No relation has been observed between the nematode population and field condition and crop varieties.