防治措施:注意控製棚內溫度和濕度,增施有機肥和生物菌肥。藥物防治:發病後用升氏200倍液或萬興700倍液+甲基托布津噴淋莖蔓。
heixingbingshipengshihuangguahuimiexingbinghaizhiyi。diwengaoshi,pengmojiyepianjieluyifabing。youmiaoranbingchangyouziyehuozhengzhufulan。shaodamiaoranbingshi,gangchuzhenyejiulandiao,xingchengshuangtouhuoduotoumiao。nenyeranbingshibingbandanhuangse2~5毫(hao)米(mi),邊(bian)緣(yuan)星(xing)紋(wen)狀(zhuang),幹(gan)枯(ku)後(hou)黃(huang)白(bai)色(se),後(hou)期(qi)形(xing)成(cheng)邊(bian)緣(yuan)有(you)黃(huang)暈(yun)的(de)星(xing)狀(zhuang)孔(kong)洞(dong)。嫩(nen)莖(jing)病(bing)斑(ban)初(chu)為(wei)水(shui)浸(jin)狀(zhuang),暗(an)綠(lv)色(se)菱(ling)形(xing),後(hou)變(bian)暗(an)凹(ao)陷(xian)龜(gui)裂(lie),濕(shi)度(du)大(da)時(shi)著(zhe)生(sheng)灰(hui)黑(hei)色(se)黴(mei)層(ceng)。生(sheng)長(chang)點(dian)染(ran)病(bing)時(shi),心(xin)葉(ye)枯(ku)萎(wei),形(xing)成(cheng)枯(ku)樁(zhuang)。幼(you)瓜(gua)染(ran)病(bing)時(shi),病(bing)處(chu)生(sheng)長(chang)受(shou)限(xian),瓜(gua)條(tiao)畸(ji)形(xing)。成(cheng)瓜(gua)病(bing)斑(ban)近(jin)圓(yuan)形(xing),凹(ao)陷(xian),有(you)透(tou)明(ming)黃(huang)褐(he)色(se)膠(jiao)狀(zhuang)物(wu)溢(yi)出(chu),凝(ning)結(jie)成(cheng)塊(kuai),濕(shi)度(du)大(da)時(shi)密(mi)生(sheng)黑(hei)色(se)黴(mei)層(ceng),病(bing)瓜(gua)一(yi)般(ban)不(bu)腐(fu)爛(lan)。
防治措施:注意提高棚內溫度,澆水後及時通風,降低濕度,縮短結露時間。發病前噴施1000~1500倍液杜邦易保預防,7~10天噴一次,連噴兩次。發病初期用杜邦福星6000~8000倍液防治,5~7天噴一次,連噴2~3次。
下茬再種黃瓜,應減少氮肥用量,結合深翻增施有機肥、菌jun肥fei和he微wei肥fei。不bu建jian議yi使shi用yong白bai石shi灰hui進jin行xing土tu壤rang消xiao毒du,因yin為wei白bai石shi灰hui雖sui有you殺sha菌jun消xiao毒du作zuo用yong,但dan大da麵mian積ji使shi用yong會hui造zao成cheng土tu壤rang堿jian化hua,得de不bu償chang失shi。可ke用yong多duo菌jun靈ling或huo甲jia基ji托tuo布bu津jin粉fen劑ji,畝mu施shi2000克,拌細土撒施,然後深翻。
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