百日红叶子发黄：
1、生命老化
bairihongyezifahuangdeyuanyinzhiyishizhengchangdexinchendaixie，bairihongshengzhangyiduanshijianhuiyouyixieyezishixinchengdaixielaohuahoufahuangdiaoluode，zheizhongqingkuangzebuxuyaodanxin，zhiyaozuohaorichangdeyanghuguanligongzuojiuhao。
2、浇水过多
bairihongnaihan，ruguojiaoshuiguoduonitutaishi，jishuijiudehuakenenggenxiqueyanghuaidiaole，yangfenbunengshusongdaoyezi，zaochenghuanghua。
解决方法：pingshirubuguoyuganhan，zebuyongjiaoshui，yujiyaozuohaopailaogongzuo，fangzhishuidalangen。
3、白粉病侵害
baifenbingshiyizhongshijiexingbinghai，jizhushifenguangfan，bairihongshitadeyigezhongyaoqinhaiduixiang。bairihongbaifenbingfabinghouchangshiziweiyepiankuhuang、tuoluo，zhijieyingxiangshushiheguanshangxiaoguo。
解决方法：zhuyirichangyanghu，tigaozhizhudekangbingxing，shengzhangjijiefabingshikepensa80%daisenxinkeshixingfenji500beiye，huo70%jiajituobujin1000beiye，huo20%fenxiuning(jisanzuotong)ruyou1500beiye，yiji50%duojunlingkeshixingfenji800beiye。
bairihongyezifahuangshihenchangjiandeyiyizhongxianxiang，bairihongyanghubijiaojiandan，zhengchangdexinchendaixiezaochengdeyezifahuangqingkuangzuida，baifenbingqinhaiyehuixuyaozhuyide，tizaoyufangyimianzaochenggengdashanghai。
