Abstract

                                The predicted damage and yield loss caused by rice leaffolders, Cnaphalocrocis medinalis (Guence) and Marasmia patnalis (Bradley) in microplot experiment during kharif 1996 showed that the yield loss was higher at the initial infestation by leaffolder larvae at 40 DAS than the infestation at 30 DAS. There was no proportionate increase in yield loss with increasing larval populations. The rate of yield loss due to an increment of one percent damage was more pronounced at 10 percent base level damage i.e., 10 to 11 percent than at higher base level damage of 20, 30 to 90 percent.

Key words : Rice, leaffolder, damage, yield loss and modelling