用厚朴苗根腐病菌分别对寄主及9科20种专化型测定植物进行土壤盆栽苗期接种试验,对照用无菌水,结果表明该病菌对厚朴苗具有很强的致病性,经鉴定为镰孢属的尖镰孢菌(F.oxysporum Schlecht)为害所致。所有专化型测定植物及对照植株均不发病,在PDA上再进行组织分离均不成功。可见,厚朴苗根腐病菌有着严格的寄主专一性,因此,将从厚朴苗上的尖孢镰刀菌定为一新的专化型,即厚朴专化型(F.oxysporum f.sp.magnoliae) Magnolia bark rot fungi were host and nine families of 20 kinds of special-type plants were inoculated in potted soil test, the control with sterile water, the results show that the fungus has a strong pathogenicity of Magnolia Bark, F. oxysporum Schlecht, identified as a Fusarium. All the specialization-type plants and control plants were not detected in the PDA and then further tissue separation were unsuccessful. Visible, Magnoliaceae root rot pathogens have a strict host specificity, therefore, from the Magnaporth spawn Fusarium oxysporum as a new specialized type, namely Magnolol special type (F. oxysporum f. sp.magnoliae)