症状:发病初期叶面覆满白色霉斑,严重时枸杞植株外现呈一片白色,相当触目,病株光合作用受阻,终致叶片逐渐变黄,易脱落。
特点:病菌以闭囊壳随病组织在土表面及病枝梢的冬芽内越冬,翌年春季开始萌动,在枸杞开花及幼果期侵染引起发病。天气干燥比多雨天气发病重,日夜温差大有利于此病的发生、蔓延。
防治:前期先选用抗病品种,播种前用新高脂膜拌种驱避地下虫害,隔离病毒感染,提高种子发芽率;合理密植保持良好的通风透光性同时喷施新高脂膜800倍液防止病菌侵染,提高抗自然灾害能力,提高光合作用强度,减少白粉病发生几率。中期加强田间管理及时剪除清理染病的枝梢,在刀剪口处涂抹愈伤防腐膜,防病菌感染侵袭;发病前喷洒针对性药剂与护树大将军,间隔7-10天左右喷1次,连续喷施2-3次,以巩固防治效果、提升枸杞抗性和免疫正能量,保护其健康成长、高产优质。最后收获时清洁田园,清除病枝残体及落叶等,集中带出田外集中深埋或烧毁,以减少田间白粉病侵染源。
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