Chinese yam (Dioscorea polystachya) has been cultivated as a food crop in Japan. The blue mold disease of Chinese yam during the storage and treatment of forced sprouting is one of the hindrances in attaining productivity that can lead to food security in tropical countries and steady farming that will eventually lead to farmers' profitability. In this study, three species of the genus Penicillium related to the blue mold of yam were isolated from two locations in Hokkaido, Japan. From the morphology and phylogeny, these were Penicillium albocoremium, P. polonicum, and P. sclerotigenum. Pathogenicity was confirmed in all Penicillium-like isolates, and sensitivity against benomyl was evaluated based on MIC. The first two species were newly recorded as the causal fungi of the blue mold of yam in Japan, and the pathogenicity of P. albocoremium is first confirmed in yam seed tuber. Moreover, some isolates showed possible resistance to benomyl.

中文翻译：

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日本北海道从薯蓣中分离出的青霉菌种的特征。

山药 (Dioscorea polystachya) 在日本已作为粮食作物种植。山药在贮藏和强制发芽处理过程中发生的蓝霉病是影响热带国家粮食安全和稳定耕作最终实现农民盈利的生产力的障碍之一。在这项研究中，从日本北海道的两个地点分离出三种与山药蓝霉有关的青霉属。从形态学和系统发育来看，它们是 Penicillium albocoremium、P. polonicum 和 P. sclerotigenum。在所有青霉菌样分离株中均确认了致病性，并根据 MIC 评估了对苯菌灵的敏感性。前两种新记录为日本山药蓝霉病的致病真菌，P. albocoremium 首次在山药种子块茎中得到证实。此外，一些分离株可能对苯菌灵产生耐药性。