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Abstract: Pleurotus ostreatus white strain is gaining in importance as a commercial mushroom species. The species has often been referred to as P. florida (Zadrazil, 1974) though it is really another strain of P. ostreatus (Eger, Eden s Wissig, 1976: Eger, 1978). The mushroom is now widely cultivated in Europe, Canada and the U.S.A. (Eger, 1979; Zadrazil, 1974), in Hungary (Heltay, 1979), in Japan and Taiwan (Kurtzman, Jr., 1979; Tan, personal observations). The substrate used for cultivating P. ostreatus white strain is generally similar to that used for the grey strain. Sawdust, cereal straw, corn cob have all been employed for use with success. The substrate for cultivation does not require composting. It also requires no pasteurization or sterilisation as the fungus is fast growing and can compete with other organisms to colonize the substrate. The growing cycle is short; three flushes of mushrooms can be obtained in a month's time (Tan, 1981). The author has previously reported that cotton waste is a good substrate for cultivation of P. ostreatus white strain (Tan, 1981). This paper describes further work which has been carried out to standardize the substrate composition and cultivation conditions.
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