早春3-4月份是苹果树腐烂病发生盛期,这时气温回升,病菌活动有了适宜的温度条件,而苹果树还未展叶,仍处于休眠阶段,抵抗病菌侵袭的能力尚弱,深冬停止扩展的腐烂病恢复活动,春季新发生的病陆续出现,发病多、扩展快,容易向树皮深层蔓延,大多将树皮烂透。为了尽可能地减轻树体受害 Early spring March-April is the peak of the apple tree rot disease, when the temperature rise, the bacteria activity with the appropriate temperature conditions, and the apple tree has not yet displayed leaves, still in dormancy stage, the ability to resist invasion is still weak, deep The winter stopped the expansion of rotten disease recovery activity, the spring new disease appeared one after another, the incidence of multiple, rapid expansion, easy to deep spread to the bark, mostly bark rot. In order to reduce the tree damage as much as possible