一、症状识别 一般现蕾期普遍发病。由植株一侧下部叶片开始,叶片边缘和叶脉间褪绿黄化,逐步由半片叶发展到整叶黄化斑驳,叶缘稍上卷,有时只有半叶发病。病株初期晴天中午萎蔫,早晚或阴雨天可恢复。后期叶片枯萎脱落,植株只剩光秆或心叶。有时只有部分枝条发病,另一侧正常。染病植株不舒展,较正常植株矮小。剖开病株的根、茎、枝、 First, the general identification of symptoms budding prevalence. From the plant side of the lower leaves began to leaf chlorotic chlorotic edge and veins, and gradually from the half of the leaf development to the whole leaf yellow mottled margin margin slightly rolled, and sometimes only half of the disease. Early blight at noon early wilt disease, morning or evening or rainy days can be restored. Late leaves withered off, the plant leaves or light leaves alone. Sometimes only part of the incidence of branches, the other side of the normal. Infected plants do not stretch, shorter than normal plants. Cut the diseased plant’s roots, stems, branches,