红掌茎基腐病病原鉴定

Identification on the Pathogens of Anthurium Footrot

１９９６～１９９７年云南省热带作物科学研究所１～２年生地栽红掌发生了严重的茎基腐病，致使根、茎、叶柄变褐，叶片黄化，叶柄脱落，植株枯死．从病组织和土壤基质中分别分离到４０和３３个分离物，经鉴定寄生疫霉Ｐｈｙｔｏｐｈｔｈｏｒａｐａｒａｓｉｔｉｃａ，光孢镰刀菌Ｆｕｓａｒｉｕｍｏｘｙｓｐｏｒｕｍ为红掌茎基腐的致病菌．

In 19961997 Anthurium footrot has been a severe disease in Tropical Crop Research Institute of Yunnan.This disease occurred on 12yearold host plants.The basal part of the plants showed brown lesions on cortices,which could spread upwards to the petiole and downwards to the root.The diseased parts rotted and the plants wilted or died with all leaves shedding eventually.In this experiment,33 isolates obtained from soil and 40 isolates obtained from different parts of diseased plants.Pathogenicity tests showed that the two isolates identified as Phytophthora parasitica and Fusarium oxysporium were pathogenic to Anthurium.Thus it was concluded that these two species of fungi are the pathogens of Anthurium Footrot.