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Conidia were formed on diseased cotyledones, most of which abscissed earlier than the healthy ones. In the field, conidia were formed only after abscission. Although no purple stain was observed on beans harvested before maturation, infection of seeds was found to have already occured at the leaf yellowing stage. Seed disinfection by Benlate-T and Homai prevented the occurrence of disease on the cotyledons. Application of Topsin-M or Benlate, during the growth period, was effective in suppressing the disease of beans. Fungicides were most effective when applied at the initial stage of bean thickening.
九州病害虫研究会の論文