| Sumario: | Common bean cultivars Flor de Mayo M38, Azufrado Tapatío, Pinto Zapata, and Pinto Villa were sown in three different dates in 2002 in Sandovales, Mexico, in order to identify fungi which infect the seed under rainfed conditions, their degree of infection, and the importance of environmental conditions on seed health. Seed from the latest sowing date (July 19) showed lower fungal infection and shorter biological crop cycle than the other sowing dates (June 14 and July 8). Fungi associated to common bean seeds, ranked by importance were: Fusarium sp., Rhizoctonia solani, Colletotrichum lindemuthianum, and Pythium sp. Cultivar Azufrado Tapatio showed the greatest infection on seed and the lowest grain yield in all sowing dates. Fungal infection was positively associated with rainfall, and negatively with grain yield, quality, and seed health.
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