Dynamics of concomitant populations of tylenchorhynchus Mashhoodi and Hoplolaimus indicus in sugarcane fields under different crop sequences

Population dynamics of Tylenchorhynchus mashhoodi and Hoplolaimus indicus from six fields having sugarcane in rotation and monoculture was studied. T. mashhoodi was the dominant species in all the fields except two, one containing jute and the other sugarcane in rotation where H. indicus was numerically dominant. In general, monoculture supported more numbers than rotations. All the crops under study promoted nematode multiplication except scan and garlic which depressed it. Under the remaining crops, population showed only one peak which synchronized with the late growth stage of the host. Correlation coefficient caldated between nematode numbers and yield of sugarcane revealed a significant negative relationship.