Identification of alpha race of Colletrichum lindemuthianum reactions on bean varieties of Phaseolus vulgaris

Abstract

The objective of this work was to identify the races of bean anthracnose, Colletotrichum lindemuthianum (Sacc. & Magn.) Scrib. which occurred in two different regions of Rio Grande do Sul, Brazil during the 1964-65 season. A second objective was to discover the sources of resistance to this disease. Nineteen single spore cultures were prepared for inoculation on 161 bean cultivars from IPEAS = Instituto de Pesquisa Agropecuária do Sul, and IPEAME = Instituto de Pesquisa Agropecuária Meridional. These cultivars were grown in the greenhouse. The experimentation was carried out in the greenhouse without temperature control. The North American cultivars used as differential varieties for race identification were: Dark Red Kidney, Michelite and Perry Marrow. The alpha race of this fungus was identified. Only 16.1% of the cultivars tested were resistant to the disease.