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近年来,我省部分地区苹果树上发生一种落叶性病害,尤其元帅,青香焦等品种受害较重。许多读者来信询问发病原因及防治办法。现请辽宁省果树所植保室副研究员景学富同志予以解答。
In recent years, a deciduous disease occurred on apple trees in some areas of our province, especially the marshal and the Qingxiang coke. Many readers asked about the cause of the disease and prevention and treatment methods. Now please Liaoning Province fruit tree planting plant associate researcher Comrade King Xuefu to answer.