PURPOSE: To obtain a mushroom cultivation base effective for suppressing the growth of harmful fungi and promoting the growth of mycelia of the mushroom, having improved labor-saving effect and production efficiency and suitable for the cultivation of Pleurotus ostreatus, Cortinellus shiitake, etc., by adding fine powder of Japanese larch generating in the lumbering of Japanese larch to the main component of a culture base. CONSTITUTION: A culture base such as a potato-dextrose agar medium is incorporated with 1-20wt.% of fine powder (preferably finer than 200 mesh) of Japanese larch generating in the lumbering of Japanese larch. The culture base is preferably used in the culture of mushroom.
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