The extent of damage produced by the pathogenic fungi on water hyacinth (Table 2) ranged from 16.67 (C. lunata and sterile fungus) to 61.11% (M. advena). Only two fungi viz.M. advena and F. pallidoroseum, however, caused more than 50% infection. Earlier, Santhi (1994) too reported 51% infection for F. semitectum (syn. F. pallidoroseum) on water hyacinth. Our data further highlight that the intensity of F. oxysporum infection ranged between 40 and 50%; and for the other fungi, it was less than 40%.