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一、白粉病1.病害。秋海棠白粉病为世界性病害,严重影响植株生长,降低观赏价值。该病主要浸染植株的叶片、茎、叶柄及花。感病部位形成灰白色或淡褐色病斑,病斑上布满白色粉状霉层,故称白粉病。病害发生严重时,感病组织逐渐坏死,最后植株整株死亡。2.防治措施。①在引进材料时,要对购买的植株、种苗进行严格的检查,尽量杜绝病株的引入。若是在野外采集野生植物,应选取健康无病的植株。②加强对海棠植株的管理养护,防患于未然。适当增施有机
First, powdery mildew 1. Diseases. Begonia Powdery mildew is a worldwide disease that seriously affects plant growth and reduces ornamental value. The disease is mainly infected plant leaves, stems, petioles and flowers. Sick parts of the formation of gray or light brown spots, spots covered with white powdery mildew, it said powdery mildew. Serious disease occurs, the infected tissue gradually necrosis, the last plant died. 2. Control measures. ① In the introduction of materials, the purchase of plants, seedlings to conduct a rigorous examination, try to eliminate the introduction of diseased plants. If the wild plants collected in the wild, should be healthy and disease-free plants. ② strengthen the management of Begonia plant conservation, take preventive measures. Appropriate organic growth