New Hosts of Pyricularia oryzae. A. O. Mackill, Former Research Scholar, International Rice Research Institute, P.O. Box 933, Manila, Philippines. J. M. Bonman, Associate Plant Pathologist, International Rice Research Institute, P.O. Box 933, Manila, Philippines. Plant Dis. 70:125-127. Accepted for publication 2 July 1985. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-125.

Cross-inoculation studies using Pyricularia oryzae isolates from grass weeds and rice showed several rice cultivars were susceptible to isolates from Rottboellia exaltata, Echinochloa colona, and Leersia hexandra. Similarly, Brachiaria distachya, E. colona, Leptochloa chinensis, R. exaltata, and L. hexandra were susceptible to some isolates originating from rice. Of the five grass weeds susceptible to P. oryzae, B. distachya and R. exaltata are previously unreported.

Keyword(s): host range.