Haack confirmed his assumption of gradual differences in resistance by making artificial inoculations on infected, less infected and healthy trees . Haack通过在被侵染，较少侵染和健康树木上实行人工接种，证实了他关于在抗性方面程度渐次不同的假设。
2.
Inheritance of resistance to cercos pora so jina hara and progeny selection under artificial inoculation and natural infection in soybean 人工接种与疫区诱发条件下大豆对灰斑病的抗性及后代选择研究
3.
Haack confirmed his assumption of gradual differences in resistance by making artificial inoculations on infected , less infected and healthy trees Haack通过在被侵染，较少侵染和健康树木上实行人工接种，证实了他关于在抗性方面程度渐次不同的假设。
4.
The resistance of 7 grapevine varieties to plasmopara viticola was estimated by natural infection and inoculation on leaf discs in vitro , as well as artificial inoculation on plants in the field , in the meantime , the regular of p . viticola and three biochemical contents were also determined 摘要利用7个酒葡萄品种对霜霉病抗性进行了鉴定，并研究了不同感病性酒葡萄品种霜霉病的发生情况及霞多丽品种叶片内三项生化指标的变化。
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