几种热带作物白粉菌寄主范围研究

Host Ranges of Powdery Mildew in Several Tropical Crops

研究了橡胶。芒果、大丽。大叶相思、瓜类等热带作物白粉菌的寄主范围。发现刺头婆、山麻杆是橡胶白粉菌的野生寄主；野艾蒿。马鞭草是大丽菊白粉菌的野生寄主。南瓜白粉菌可以侵染苦瓜、毛瓜，不能侵染冬瓜、丝瓜、黄瓜，用５种瓜的白粉菌接种南瓜均不成功。芒果、大叶相思白粉菌未发现野生寄主。

The host ranges of powdery mildew in Hevea brasiliensis，Mangifera indica，Dahliasp，Abrus precatorius，Cucurbita spp，Cucumis spp were investigated，It was discovered thatUrena lobata sp.and Alchornea davidii Franch were the alternative hosts of Oidium hevea；Chrysanthemum coronarium L. and Tectonae sp. were the alternative hosts of Oidium dahlia.This is the first report on the host ranges of powdery mildew. The powdery mildew of Cucurbitamoschata（Duch）POir，Can infect Momordica charantia L. and Cucumis melo L.，but cannot in-fect Benincasa hispida Cogn，Luffa cylindrica Roem and Cucumis sativus L.Inoculating with theirpowdery mildew to Cucurbita moschata（Duch） poir was not successful．No alternative hosts ofpowdery mi ldew of Mango and Abrus precatorius were found.