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一、桃褐腐病1.症状与发生 桃褐腐病主要危害果实,也危害花、叶和新梢.花受害时,柱头先变暗,逐渐蔓延至花托和花梗,最后变褐枯萎,天气潮湿时迅速腐烂.干燥时则美垂干枯但不脱落.嫩叶受害变黑,萎垂,残留于枝上不脱落.枝梢受害,先是新消,然后是较大的枝条上产生长圆形灰褐色病斑,并发生流胶,严重时小枝枯死.果实从幼呆至成熟期甚至贮藏期内均可受害,初期为褐色圆形病斑,然后整果变褐腐烂,干缩成僵果悬挂枝上,经年不落.褐腐病病菌在僵果或桃树的病部越冬,次年通过皮孔和伤口侵染花、叶、嫩枝及果实.在生长条件适宜时,特别是在20—25℃的多雨潮湿条件下,当健、病果接触时,病菌亦能从无伤处侵入果实,在贮藏期中能继续传染危害.
First, the peach brown rot 1. Peach brown rot symptoms and the main hazards of fruit, but also endanger the flowers, leaves and shoots. Flower damage, stigma first darken, and gradually spread to the receptacle and pedicel, and finally brown, withered, weather Rapid decay when wet .When the United States dry down the United States dry but does not fall off .Brown leaves damage black, Wei-Wei, left in the branches do not fall off.Stops victim, the first new consumer, then the larger branches produce oval Taupe spots, and the occurrence of plastic flow, severe branchlet dead. Fruit from young to mature or even during storage can be harmed, the initial brown circular lesions, and then the whole fruit brown rot, shrinkage into a frozen fruit Hanging branches, after years do not fall. Brown rot pathogen in the winter fruit or peach tree disease, the following year through the lenticels and wounds infested flowers, leaves, twigs and fruits in the growth conditions are appropriate, especially Under rainy and humid conditions of 20-25 ℃, bacteria and bacteria can invade the fruit from no injury when it is in contact with health and disease, and can continue to be infected during storage.