Studies on the effect of different levels of nitrogen to rice crop on the incidence of rice sheath mite, Steneotarsonemus spinki Smiley was conducted at the College Farm, N.M. College of Agriculture, Navsari, Gujrat during wet season. The results indicated that unfertilized rice crop had significantly lower number of mites (21.56 mites leaf sheath^-1) and discolored leaf sheaths (5.50 cm) than fertilized crop. It showed that the growth of rice plants as influenced by nitrogen level had definite bearing on incidence of mite. The results further indicated that mite population had a tendency to increase in number with an increase in nitrogenous fertilization to rice plants.