【Key words】 Puccinia triticina； Pathogenic types； Virulence frequency； Interaction；
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... pathogenicity category 致病类型 Pathogenicity Neisser 致病性奈瑟菌属 balanced pathogenicity 平衡致病性 ; 均衡致病性 ...
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阐述了甘薯瘟菌系致病类型、品种抗性分类、抗性遗传趋势和病菌潜伏侵染特征；
The pathotypes, classification of cultivar resistance, advancement of resistance genetics and latent infection of bacterial wilt disease of sweet potato were presented.
并就新小种类型对目前主要生产品种和抗源的致病特点进行了研究，为品种布局和抗源选用提供了具体目标。
The pathogenic characteristics of the main productive varieties and resources are studied. This report also presents concrete objectives for variety deployment and selection of resistance resources.
相当多的旁证表明侯鸟能够传播低致病性禽流感的H5和H7亚型病毒给家禽，然后，变异成高致病性类型。
Considerable circumstantial evidence suggests that migratory birds can introduce low pathogenic H5 and H7 viruses to poultry flocks, which then mutate to the highly pathogenic form.
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