Relationship between initial densities op Rotylenchulus reniformis and damage to cotton with a pit to seinhorst's curves

Inoculation of logarithmic series of Rotylenchulus reniformis to cotton, under green house conditions, revealed significant growth reduction beyond 100 young females per 1000 cc of soil, 30 days after inoculation. After 60 days, growth reduction was significant even at 10 young females per 1000 cc of soil. The threshold level for damage was 1000 young females per 1000 cc of soil. A computer programme based on algorithm given by Ferris et al. (1981) has been developed for fitting Seinhorst curves. The tolerance levels for shoot weight, root weight and leaf area were respectively 16.2 and 18 nematodes per 200 cc of soil at 60 days.