三种杨黑斑病菌的寄主范围及在我国部分地区的分布

杨树黑斑病是杨树的重要病害之一。目前国外已报道的杨黑斑病菌的种类有10种,许多学者认为保留Marssonina brunnea(Ell.et Ev.)Magn.,M.populi(Lib.)Magn.和M.castagnei(Desm.et Mont.)Magn.三个种,Cellerino和Rimpau把M.tremulae作为独立的种,Spiers把M.tremulae作为M.brunnea寄生于白杨派山杨亚派(Trepidae)的一个专化型(M.brunnea f.sp.trepidae)。M.balsamiferae Hiratsuka则是新近在加拿大发现的,其他的名称均为上述各种的异名。我国已报道的有三种,即M.brunnea(M.populicola为其异名)、M.populi和M.castagnei其中M.brunnea与M.populi的区分,主要是以分生孢子分隔处是否有缢缩为根据的,并认为前者的寄主范围以青杨派为主,后者以黑

HOST RANGE AND DISTRIBUTION OF THREE MARSSONINA SPECIES PATHOGENIC TO POPLARS IN PART REGION OF CHINA

Eighty-eight specimens of poplars infected with Marssonina, collected from nine provinces or autonomous regions in China, were examined. M. populi and M. castagnei were only found in specimens from Xinjiang. M. brunnea were found in the other provinces. The species pathogenic to poplars in Nanjing area should be M. brunnea, other than M. populi as reported previously. Host range tests of three Marssonina species and the relative susceptibility of various poplars to these fungi were conducted with artificial inoculation.