Effects of temperature, water activity and oxygen concentration on extension of blue-stain caused by Leptographium wingfieldii in Japanese red pine (Pinus densiflora) wood
2003
Taniguchi, H. (Iwate-ken. Forest Experiment Station, Takizawa (Japan)) | Koiwa, T. | Masuya, H. | Doi, S.
Leptographium wingfieldii Morelet causes blue-stain of Japanese red pine (Pinus densiflora Sieb. et Zucc.) wood. The effects of temperature, water activity and oxygen concentration on mycelial growth of the fungus and the extension of blue stain were investigated by culturing the fungus on 2% malt agar (MA) medium and Japanese red pine wood blocks. The greatest mycelial extension was observed at about 25 deg C on 2% MA medium. Increasing water activity enlarged mycelial growth and blue-stain while oxygen concentration of less than 5% arrested blue-stain. Blue-stain extensions in pine wood blocks were observed between 50 and 180% initial moisture content (MC). The highest rate of blue-staining was observed at the stage when the MC of the wood blocks declined from 150-180% to 120-150%. No blue staining appeared at less than 50% MC. From the above results, it is assumed that blue-stain of Japanese red pine caused by Leptographium wingfieldii occurs between 50 and 150% MC of the wood when enough oxygen and water can be secured. Blue-stain is suppressed at more than 150% MC by insufficient oxygen concentration and at less than 50% MC by insufficient water supply.
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