苹果树腐烂病是由于囊菌(Valsa mali Miyabeet Yamada>从树干表皮入侵并扩展而形成的对苹果树危害极其严重的一种病害。一般常在早春及6—7月间出现发病高峰,在主干或主枝上病斑溃烂,轻者局部刮去树皮,重者则须截枝或全株铲除。这种病在我国华北、东北、西北地区都有发生,且发病率很高,病树长势衰弱,枝干残缺,产量下降,甚至造成毁灭性的灾害。长期以来,在加强栽培管理促进树势健壮的基础上,很多单位开展了药物治疗的研究,其中,砷平液与甲基托布津等涂抹病疤 Apple tree rot disease is caused by Valsa mali Miyabeet Yamada, a disease that is most severely damaged by the invasion and expansion of the epidermis of the tree trunk, and usually occurs in early spring and June-July. In the trunk Or main branch spot fester, the light local scrape off the bark, severe cases have to cut or whole plant to eradicate this disease in our country in North China, northeast and northwest regions have occurred, and the incidence is high, the disease tree Growing weak, branches incomplete, production decline, and even cause devastating disasters.For a long time, to strengthen the cultivation and management to promote the robustness of the tree based on a number of units to carry out the study of drug treatment, of which arsenic and methyl Bujin and other smear scars