從病害發生的三個必要條件（寄主-植株本身

、環境條件、病原物）來lai看kan
，三san者zhe缺que一yi不bu可ke，合he理li的de植zhi株zhu管guan理li以yi及ji溫wen濕shi度du等deng環huan境jing條tiao件jian的de調tiao控kong
，對dui於yu是shi否fou發fa病bing也ye至zhi關guan重zhong要yao。如ru何he加jia強qiang管guan理li，提ti高gao黃huang瓜gua植zhi株zhu的de抗kang病bing能neng力li和he創chuang造zao適shi宜yi黃huang瓜gua生sheng長chang而er又you減jian少shao霜shuang黴mei病bing危wei害hai的de環huan境jing，必bi須xu了le解jie黃huang瓜gua霜shuang黴mei病bing的de發fa生sheng條tiao件jian
，黃huang瓜gua霜shuang黴mei病bing適shi宜yi在zai大da約yue20-25攝氏度，空氣相對濕度85%shi，fabingsuduzuikuai。suoyiwenshidudeguanlizhiguanzhongyao。zaiguanliguochengzhong，yangekongzhiwenshiduduifangkongshuangmeibinghenzhongyao
，lirujiaoshuishijiandexuanze，yibannonghugenjuzijideshijiananpai
，choukongjinxingjiaoshui，suiyixingjiaoda，helidejiaoshuishijianyingxuanzaiqingtiandezaoshang，richuzhiqianjinxingjiaoshui，bimianlediwendejiangdihebianyujiaoshuihoudewenduguanli。jiaoshuihoudangtianzhongwu，jiangpengshineiwendutigaodao35攝氏度持續50fenzhong
，zaikaishitongfeng
，nengxunsujiangdipengshineidekongqishiduyeliyuwendufangkongfahuizuoyong。youyuqianqipengshineidedifeichongzu，zhizhuxishoudansujiaoduotuchangshi，rongyizaochengzhizhuneibutandanbilishitiao，xingchengduishuangmeibingdeganxing，jiyishoudaoshuangmeibingdeweihai。suoyi
，zaizhizhushengchangqianqi，yinggaitongguokongwenkongshuidengcuoshi
，jinxingshidangdedunmiao，peiyangchuzhuang、旺(wang)但(dan)不(bu)徒(tu)長(chang)的(de)植(zhi)株(zhu)，使(shi)葉(ye)片(pian)積(ji)累(lei)養(yang)分(fen)多(duo)
，增(zeng)加(jia)葉(ye)片(pian)的(de)厚(hou)度(du)，從(cong)而(er)提(ti)高(gao)葉(ye)片(pian)和(he)植(zhi)株(zhu)的(de)抗(kang)病(bing)性(xing)。這(zhe)也(ye)是(shi)為(wei)何(he)要(yao)在(zai)防(fang)治(zhi)藥(yao)劑(ji)中(zhong)加(jia)入(ru)糖(tang)的(de)原(yuan)因(yin)所(suo)在(zai)。

誤區二：藥劑應用無選擇，亂混亂用。

這是種棚的新手容易犯的一個錯誤，葉片出現了幾個霜黴點，便用藥劑對其進行“狂轟亂炸”。binghaifashenghou，yaoqiulijijianxiaoguo，zhijiepenshigaoxiaodezhiliaoyaoji，suirannengdadaoliganjianyingdexiaoguo

，danshiyehuishibingjunzaiduanshijianneichanshengkangxing
，gengweixiayilundeqinranweihaimaixiayinhuan。suowei“防患於未然”，病害的防治也是這個道理。在選擇藥劑防治時

，可以簡單地分為三個防治階段（病害未發生期、病害發生初期、病害發生嚴重期），按照用藥周期在病害未發生前可以選擇保護性的藥劑噴施，如百菌清、甲基托布津、百泰等
，病害發生初期可以選擇保護兼治療性的藥劑
，如72%的霜脲氰錳鋅，64%的甲霜靈錳鋅。病害發生嚴重期，可以選擇兩種藥劑進行混用，如可以選擇40%的氰霜唑懸浮劑500倍+69%的烯酰嗎啉錳鋅500倍進行混合噴施
，會增強防治效果。特別是在黃瓜霜黴病與其他病害如炭疽病或者是細菌性角斑病、細(xi)菌(jun)性(xing)葉(ye)枯(ku)病(bing)等(deng)混(hun)發(fa)時(shi)，防(fang)治(zhi)過(guo)程(cheng)中(zhong)應(ying)注(zhu)意(yi)區(qu)分(fen)，不(bu)宜(yi)多(duo)種(zhong)病(bing)害(hai)一(yi)起(qi)用(yong)藥(yao)。反(fan)之(zhi)，不(bu)但(dan)起(qi)不(bu)到(dao)良(liang)好(hao)的(de)效(xiao)果(guo)而(er)且(qie)造(zao)成(cheng)葉(ye)片(pian)的(de)隱(yin)形(xing)藥(yao)害(hai)

，得(de)不(bu)償(chang)失(shi)。多(duo)種(zhong)病(bing)害(hai)混(hun)合(he)發(fa)生(sheng)，應(ying)該(gai)根(gen)據(ju)天(tian)氣(qi)、pengshineiwenshidudenghuanjingtiaojian，xuanzezhuyaodebinghaijinxingyouxianfangzhi。tebieshijinjinianlai，zaishouguangpengshineidehuangguashuangmeibingyibanyutanjubinghunhefasheng，suoyizaifangzhishi，keyiyibingyongyao，ruguoshihaichanzayouxijunxingbinghai，keyi“先治霜黴和炭疽，後治角斑和葉枯”。zaizhe
，yongyaoshiwangwangyibingyongyao，zhucibufen。zaiyongyaoqianyidingyaoqufenganranshuangmeibingdezhongxinbingzhuhefabingdechuqinranyuan，jinxingzhongdianfangkong，bushizhitongguoyiweidepenyaojiejue。biru，weiyuqianlianbuweidezhizhu，yinweiqianbudishuiyanzhong，shiduda
，suoyiyibanchengweishuangmeibingdezhongzaiqu，duiyuzhexiezhizhuyishiyaojishipensayaoji，erkeyitongguoyongneixixingyaojiguangendefangfa
，conggenbuyongyao
，shangxiachuandaojinxingzhiliao，ruyong80%的乙磷鋁可濕性粉劑500倍灌根，每株灌3兩藥水，能起到優異的防治效果。