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病原及发病规律引起大叶黄杨白粉病的真菌属于子囊菌白粉菌目,病菌以菌丝体在寄主的芽内越冬或以分生孢子在病叶上越冬,翌年从春季至秋季均可发病,温暖而干燥的气候条件有利于病害的发展。病害症状大叶黄杨易受白粉病危害的是嫩叶和新梢,其最明显的症状是在叶面或叶背及嫩梢表面布满白色粉状物,后期渐变为白灰色毛毡状。严重时叶卷曲,枝梢扭曲变形,甚至枯死。防治方法:1、加强栽培措施(1)注重改善植株生长环境,使
Pathogen and pathogenesis The euphorbia euphorbia powdery mildew belongs to Ascomycetes powdery mildew, mycelium in the host’s buds overwinter or conidia in diseased leaves overwintering, the next year from spring to autumn can be disease, Warm and dry climatic conditions are conducive to disease development. Diseases Symptoms of Eupatorysate susceptible to powdery mildew is the young leaves and shoots, the most obvious symptoms are in the leaves or leaves and tender shoots covered with white powder, the latter gradual change to white-gray felt-like. Serious leaves curly, twisting distortion, even dead. Prevention and treatment methods: 1, strengthen cultivation measures (1) focus on improving plant growth environment, so