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篱架葡萄穗白腐病最初多出现于6月中、下旬,病穗首先开始于架下,呈多点散发,7月份雨季以后,隨着雨水渐勤,病害乃逐蔓延而散见于架面。观察指出;造成白腐病发生的以上诸特点,除了最初侵染源来自表层土壤这一重要因素外,也与果园微气侯结构的关系至为密切。在枝叶茂密的葡萄园里,架下往往相当郁蔽而潮湿,白天地面温度较架上高,但夜间却常常产生显著的逆温。由于夜间地面湿度高,温度低,尤其在6月份葡萄座果后,正值华北干旱的季节,此时倘有微雨或灌溉,每引起架下偶然的水份凝聚,而架上却远较干燥。水份凝聚是有利于病害的侵染和发生的。因此6月份中、下旬架下先出现病害,及至7—8月份雨季里,架上下的湿度都高,故差异不显著,此时病害也就散见于架面,而且雨量愈多,流行愈炽。
Spike white rot mainly appeared in the middle and late June, the panicle first began to be erected and distributed in multiple spots. After the rainy season in July, . Observations indicate that the above-mentioned characteristics that cause white rot occur in close relationship with the microclimate structure of the orchards, except for the fact that the primary source of infection is from the surface soils. In the leafy vineyard, shelves are often very dark and wet shelves during the day, the ground temperature is elevated, but at night it often produces significant inversion. Due to the high humidity at night and the low temperature, especially after the grape fruit in June, it is arid season in North China. At this time, if there is light rain or irrigating, dry. Water condensation is conducive to disease infection and occurrence. Therefore, in June the first and second days of the disease, and until the rainy season from July to August, the shelves up and down the humidity are high, so the difference is not significant, then the disease also scattered in the shelves, and the more rainfall, the more epidemic .