Comparative pathogenesis and mating type of Moroccan isolates of Pyricularia grisea (Magnaporthe grisea) from rice and Stenotaphrum secundatum

Moroccan isolates of Pyricularia grisea (Magnaporthe grisea) from Orzya sativa and Stenotaphrum secundatum were crossed with standard fertile isolates (mating type Mat 1.1 and Mat 1.2) by using the three-points culture method on oatmeal agar. Only Mat 1.1 isolates from rice were identified and considered to have only the ability to function as males, whereas no isolate from S. secundatum mated with Mat 1.1 or Mat 1.2. Cross-inoculation studies using Pyricularia grisea (M. grisea) isolates from Oryza sativa and S. secundatum show that rice varieties cultivated in Morocco were susceptible to isolates originating from S. secundatum. Similarly, S. secundatum was susceptible to some isolates from O. sativa.