看是白粉病和药害。可用40%氟硅唑乳油4000倍液＋75%百菌清可湿性粉剂600倍液；12.5%烯唑醇可湿性粉剂2000-4000倍液＋75%百菌清可湿性粉剂600倍液；75%肟菌·戊唑醇水分散粒剂2000-3000倍液，兑氨基酸或海藻酸液肥兑云苔素内脂喷雾，视病情隔5~7天喷1次。
