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摸清不同发育阶段叶片的感病性,是白粉病流行规律及防治研究的基础工作。前人已作过幼苗及离体枝条或叶片的室内测定,充分肯定病菌只能侵害尚未角质化的嫩叶,并肯定不同发育期嫩叶的感病性有明显的差异。但是,对于在自然条件下各发育阶段叶片的田间感病水平测定尚未见报导。国内以往对流行规律研究,未充分注意叶片不同发育期的田间感病性,物候标准的病理学意义不够明确。
To understand the different stages of the development of leaf susceptibility is the prevalence of powdery mildew and prevention and control of the basic work. Predecessors have made in vivo determination of seedlings and detached shoots or leaves, fully affirmed that the bacteria can only infringe the not keratinized young leaves, and affirmed the susceptibility of young leaves at different developmental stages were significantly different. However, there is no report about the field susceptibility of leaves in different developmental stages under natural conditions. In the past, the studies of epidemic laws in China did not pay sufficient attention to the field susceptibility of leaves at different developmental stages. The pathological significance of phenology criteria was not clear enough.