一种镰刀菌对空心莲子草的致病力与寄主专一性测定

从罹病的空心莲子草上分离到一种镰刀菌,人工接种条件下,3叶期的空心莲子草幼苗最易发病,叶部次之.在供试的4个菌株中,以YZ-03菌株的致病力最强,该菌株接种空心莲子草幼苗5d后,接种的植株病情指数已达100,8d后幼苗全部枯死;人工接种叶片和茎秆9d后,叶片的病情指数达90.95,接种茎秆的病情指数达85.19.采用27科61种植物对该镰刀菌进行寄主专一性测定,结果表明,该镰刀菌能使莲子草严重发病,也能侵染藜的幼苗,对包括主要农作物在内的其他59种植物均无致病性.

Host Range and Pathogenicity of a Fusarium Species to Alternanthera philoxeroides

Four strains of Fusarium species were isolated from diseased leaves and stems of Altenanthera philoxeroides.Young seedlings of A.philoxeroides at three-leaf stage were most susceptible to the Fusarium pathogen,and leaves of A. philoxeroides were the next.YZ-03 was most pathogenic among the 4 strains tested.Disease index(DI) of the seedling of A.philoneoides at three-leaf stage was 100 after 5 d of inoculation with the strain.The DI values on the leaves and stems were 90.95 and 85.19 respectively after 9 days of inoculation.Host-range tests indicated that the pathogen could cause serious disease on seedling of A.sessilis and infected Chenopodium album seedling.However,the pathogen didn't infect other 59 tested plants including several agricultural crops.