论文部分内容阅读
苹果树白绢病多发生于离地5～10cm的根须处, 初显褐色病斑,后逐渐环绕根颈扩展腐烂,有较浓的霉臭味,皮表生一层白色绢丝状菌丝体。初侵染期为4月上中旬,7～9月发病迅速,由于树上症状不明显,故难以察觉。现据其发病规律及药剂试验,提出防治意见。 一、加强果园管理。深翻改土,改善土壤透气性,增
Apple tree Sclerotium occurs in the roots of 5 ~ 10cm from the ground at the beginning of the first brown spots, and then gradually expand around the root neck rot, a strong moldy odor, skin layer of white silk filamentous bacteria Silk body. Initial infection in the middle of April, 7 to September rapid onset, due to tree symptoms is not obvious, it is difficult to detect. According to its pathogenesis and pharmaceutical tests, put forward prevention and treatment advice. First, to strengthen orchard management. Deep changes in soil, improve soil permeability, increase