Pestalotia longiseta Spegazzini によるチャ新梢枯死症の発生とその感染時期および感染部位

概要

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Involvement of Pestalotia longiseta in the development of symptoms of tea shoot blight and the initial infection site of the fungus were investigated. When two species of tea gray blight-causing fungi, Pestalotia longiseta and P. theae were inoculated to a variety Yabukita, which is susceptible to shoot blight, only P. longiseta caused the symptoms but P. theae did not. P. longiseta did not cause shoot blight on a variety Yamakai which is resistant to the fungus. P. longiseta was isolated at a high rate from young and fresh lesions on the twigs where as Glomerella cingulata was more frequently isolated from older and well developed lesions. When G. cingulata alone was inoculated to Yabukita, no symptoms appeared. Primary symptoms of shoot blight usually appear at the points of attachment of petioles to twigs and particularly those of scale leaves or incomplete leaves to twigs. When P. longiseta was inoculated to shoots of different growth stages in opening time of leaves, the shoots of 2 to 4-leaf stage, on which scale leaves or incomplete leaves were apt to fall off, were the most susceptible. From these results it was suggested that P. longiseta primarily infects the young shoots through the wounds made by the abscission of scale leaves or incomplete leaves and then G. cingulata secondarily colonizes in the tissue preinfected by P. longiseta expanding the lesion areas.
日本植物病理学会の論文
1986-12-25