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近年来,在山东费县山楂树上发现一种新病害——山楂茎基腐病。植株感病后,地上部叶片枯黄,新枝叶短小,后期叶片枯死。在近土表至土表以上20—30cm 处树干腐烂,当地上部表现枯黄时,其土表层下树干基部的树皮易脱落,老皮、翘皮脱落后,木质部呈现黑色或黑褐色,随着病害进一步发展造成环状茎基腐烂,不久整株死亡。该病以为害结果的成龄山楂树为主,症状表现时期为7—8月。经病原菌分离鉴定,将引起该病的病原菌暂定名为 Phy-tophthora sp.。有关病原菌的种名有待进一步确定。
In recent years, a new disease has been found on Hawthorn in Fei County, Shandong Province - hawthorn stem rot. Plant susceptible, aboveground leaves yellow, new branches and leaves short, late leaves dead. In the near surface soil to 20-30cm above the soil surface of the trunk decay, the local performance of the yellow, the top surface of the trunk bark off easily under the soil surface, the old skin, Alice off, the xylem showing black or dark brown, with the The further development of the disease caused ring-shaped stem rot, and soon the whole plant died. The disease to harm the results of mature hawthorn-based symptoms of the performance period of 7-8 months. The pathogen isolated and identified, the pathogen will cause the disease tentatively named Phy-tophthora sp .. The name of the pathogen to be further confirmed.