Abstract:

Dwarf wilt of Phoenix canariensis and Washingtonia robusta were discovered from tree nursery and the street tree in Xiamen, China.These disease tissue were blacked and rotted in bottom stem. Thielaviopsis aethacetica Ment = Thielaviopsis paradoxa (de Seyn.) Hohn was isolated from the disease tissue.The same symptoms and same fungal isolates were caused by inoculated the fungus on the plantlets of Phoenix canariensis in tree nursery and pot culture. So,the fungus was identified as pathogen of dwarf wilt by Koch's postulates. The disease symptoms and the morphological character of the pathogenic fungus were described.

Key words: dwarf wilt, Thielaviopsis aethacetica, Phoenix canariensis, Washingtonia robusta