Angular leaf spot incited by the fungus Phaeoisariopsis griseola is a major common bean disease, and may cause important yield losses. An effective, practical and economic way to control this disease is the use of resistant cultivars. However, the high pathogenic variability of P. griseola makes the development of such resistant cultivars a difficult task. In this case, pyramiding of resistance genes may be used if a longer lasting resistance is to be sought.
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