COLLETOTRICHUM LINDEMUTHIANUM DIVERSITY IN BURUNDI AND INFLUENCE OF BEAN DEVELOPMENT STAGE ON ANTHRACNOSE SEVERITY
J BIGIRIMANA, G DE MEYER, P DE ROP, J POPPE and M HÖFTE
Laboratory of Phytopathology, University Gent, Coupure Links 653, B-9000 Gent, Belgium
Background and objectives
Materials and methods
Results and conclusions
The results indicate that the 14 C. ;lindemuthianum isolates tested are distributed in 10 different groups based on virulence to nine bean varieties. Races are to be characterized using the 12 differential bean cultivars . Seeds or primary leaf inoculation resulted in the same resistance grouping of bean varieties. This indicates that the fast and easy seed inoculation technique can be used to differentiate bean cultivars. However, bean varieties consistantly displayed more resistance upon trifoliate leaf inoculation than upon primary leaf or seed inoculation. This indicates that evaluation of resistance based on primary leaf or seed inoculation underestimates field resistance of bean varieties. We are currently studying whether induced resistance can improve the performance of sensitive and intermediate bean varieties. Preliminary results have demonstrated that soil treatment with Trichoderma harzianum T39 induces resistance to C. ;lindemuthianum in both sensitive and intermediate bean varieties.