Pathogénie Comparée et Signe Sexuel des Isolats Marocains de Pyricularia grisea (Magnaporthe grisea) Originaires de Riz et de Stenotaphrum secundatum

Comparative Pathogenesis and Mating Type of Moroccan Isolates of Pyricularia grisea "Magnaporthe grisea# from rice and Stenotaphrum secundatum Moroccan isolates of Pyricularia `risea "Ma`naporthe `risea# from Oryza sativa and Stenotaphrum secundatum were crossed with standard fertile isolates "mating type Mat 0[0 and Mat 0[1# by using the three!points culture method on oatmeal agar[ Only Mat 0[0 isolates from rice were identi_ed and considered to have only the ability to function as males\ whereas no isolate from S[ secundatum mated with Mat 0[0 or Mat 0[1[ Cross!inoculation studies using Pyricularia `risea "M[ `risea# isolates from Oryza sativa and S[ secundatum show that rice varieties cul! tivated in Morocco were susceptible to isolates orig! inating from S[ secundatum[ Similarly\ S[ secundatum was susceptible to some isolates from O[ sativa[