苹果“烂葫芦”*,是发生在苹果根颈部位和大根基部的病害,造成皮部腐烂,树势衰弱,严重时整株死亡。近年来,我社东战家大队林业队遵照毛主席“自然科学是人们争取自由的一种武装”的伟大教导,经过几年科学实验,摸索出一套有效的防治方法。这些经验在我社推广之后,效果很好。普遍 Apple “bad gourd” *, is a disease that occurs in the apple root neck and large roots, resulting in decay of the dermis, weakening of the tree, and death of the entire plant in severe cases. In recent years, the forestry team of our club East Warfighter Brigade abided by the great teaching of Chairman Mao that “natural science is an armed struggle for freedom.” After several years of scientific experiments, we have explored an effective prevention and control method. After the promotion of these experiences, I worked very well. universal