越(yue)冬(dong)棚(peng)室(shi)黃(huang)瓜(gua)最(zui)容(rong)易(yi)發(fa)生(sheng)白(bai)粉(fen)病(bing)和(he)蔓(man)枯(ku)病(bing)，是(shi)外(wai)界(jie)條(tiao)件(jian)和(he)黃(huang)瓜(gua)生(sheng)育(yu)期(qi)決(jue)定(ding)了(le)這(zhe)兩(liang)種(zhong)發(fa)病(bing)種(zhong)類(lei)。秋(qiu)後(hou)冬(dong)前(qian)
，我(wo)國(guo)北(bei)方(fang)地(di)區(qu)因(yin)棚(peng)室(shi)白(bai)天(tian)溫(wen)度(du)高(gao)，放(fang)風(feng)時(shi)間(jian)較(jiao)長(chang)
，空(kong)氣(qi)濕(shi)度(du)小(xiao)；而(er)晚(wan)上(shang)往(wang)往(wang)因(yin)溫(wen)度(du)下(xia)降(jiang)，棚(peng)中(zhong)空(kong)氣(qi)濕(shi)度(du)會(hui)隨(sui)著(zhe)升(sheng)高(gao)，常(chang)造(zao)成(cheng)一(yi)晝(zhou)夜(ye)間(jian)空(kong)氣(qi)濕(shi)度(du)高(gao)低(di)周(zhou)期(qi)性(xing)變(bian)化(hua)，這(zhe)種(zhong)幹(gan)濕(shi)交(jiao)替(ti)變(bian)化(hua)的(de)環(huan)境(jing)條(tiao)件(jian)，恰(qia)恰(qia)是(shi)黃(huang)瓜(gua)白(bai)粉(fen)病(bing)和(he)蔓(man)枯(ku)病(bing)所(suo)需(xu)要(yao)的(de)
，適(shi)於(yu)這(zhe)兩(liang)種(zhong)病(bing)的(de)發(fa)生(sheng)發(fa)展(zhan)。而黃瓜越冬栽培，冬前正處於苗子定植後的團棵期
，其子葉尚未完全幹枯
，上邊所攜帶的病害，白粉
、蔓枯
、霜黴菌等最易就近向葉片傳播，尤以白粉菌和蔓枯病最為常見。

baifenbingfashengshi，zaiziyehuoyemianshengchubaisefenban，yanzhongshizhenggeyepianbeibaifenfugai，shichangshibianruo
，yingxiangshengchangfayuhechanliang。pengshihuangguajinruyanhandedongji，yinpengzhongyejianchangchangshidujigao，yepianshangduohuijielu
，baifenjunbaoziyudaogaoshiyouqishiyudaoshui
，jiupengzhangsiwang。suoyipengshihuangguadebaifenbingjinrushendonghuibuzhieryu，guerfangzhishijianzhongdianshidingzhihouzhiyandongzhiqian。

mankubingfashengshi，wangwangxianzaiziyeshangfasheng，bingbanchenghese
，shangmianzheshenghenduoxiaoheidian，shengchengbaozi，zaibabaozichuandaozhenyeshang，shiyezifashengyoubianyuanhuozhongjianruqindeheban，dadekeda2—3厘米，使葉子變黃衰老；也能在近地麵處為害莖基部
，生白黃色長條斑，流出褐紅色膠狀物，後期病部腐爛、縱裂，上部枯死。

防(fang)治(zhi)這(zhe)兩(liang)種(zhong)病(bing)害(hai)，首(shou)先(xian)是(shi)消(xiao)除(chu)傳(chuan)染(ran)源(yuan)。應(ying)在(zai)黃(huang)瓜(gua)定(ding)植(zhi)後(hou)人(ren)工(gong)剪(jian)除(chu)帶(dai)病(bing)的(de)子(zi)葉(ye)。黃(huang)瓜(gua)子(zi)葉(ye)營(ying)養(yang)豐(feng)富(fu)，待(dai)真(zhen)葉(ye)變(bian)大(da)時(shi)生(sheng)命(ming)力(li)變(bian)弱(ruo)，種(zhong)皮(pi)上(shang)的(de)各(ge)種(zhong)病(bing)害(hai)多(duo)先(xian)在(zai)此(ci)發(fa)生(sheng)發(fa)展(zhan)。真(zhen)葉(ye)長(chang)大(da)時(shi)子(zi)葉(ye)向(xiang)植(zhi)株(zhu)供(gong)應(ying)儲(chu)存(cun)營(ying)養(yang)的(de)任(ren)務(wu)已(yi)完(wan)成(cheng)，繼(ji)續(xu)留(liu)著(zhe)已(yi)無(wu)用(yong)，更(geng)重(zhong)要(yao)的(de)是(shi)，這(zhe)些(xie)子(zi)葉(ye)是(shi)白(bai)粉(fen)
、mankudengbinghaizuixianranbingdedifang，youcichanshengdebingbanhuichanshengdaliangdebingjunbaozi，xiangzhouweichuanbo
，shihuangguayepianhejingdengchufabing。suoyidingzhihoujishijianchuziye

，jikexiaochuzheliangzhongbingdechuanran“根據地”
，shihuangguamianshouqihai。jianchushijianyiyizaishiweihao

，huangguamiaozhiyaoyouliangpianjiaodadezhenyejikejianchuziye。congfangbingjiaodukanzaojianbiwanjianhao，danbunengzaoyuliangyeyixinshiqi，yimianjianchuguozao
，ziyegongnengbunengchongfenfahui。jianchuziyeshi
，yaodongzuoqingwei
，libizhendong，bingxianshoujizaiwandengqiminzhong，hounachupengwai
，maiyutuxia。

　　其次是噴藥防治。為防治白粉病可噴用30％氟菌唑2000倍液或10％苯醚甲環唑 （世高）3000倍；防治蔓枯病可噴用百菌清600倍液或25％咪酰胺1500倍液。如果這兩種病害一起防治，則可以用氟菌唑2000倍或世高3000倍混加百菌清600倍一塊噴用。