《植物病虫害绿色防控技术》课件——三、玉米纹枯病绿色防控（双语版）.pptx

;玉米纹枯病又称玉米烂脚瘟，我国始见于1966年的吉林省，在上世纪70年代中后期逐渐成为我国玉米主产区的一种重要病害。在四川、重庆、贵州、江苏、浙江、河南、陕西、山东等省及两湖、两广地区的春、夏、秋玉米均有纹枯病的发生。一般年份发病率达40%，严重时发病率达70%。

Cornsheathblight,alsoknownascornrotblight,wasfirstseeninJilinProvincein1966andgraduallybecameoneofthemajordiseasesinthemaincorn-productionareasinChinainthemiddleandlate1970s.SheathblightoccursinSichuan,Chongqing,Guizhou,Jiangsu,Zhejiang,Henan,Shaanxi,Shandongandotherprovinces,aswellasinspring,summerandautumninHunan,Hubei,GuangdongandGuangxi.Theincidenceincommonyearsis40%,or70%inseriouscases.;;（一）症状识别SymptomIdentification

玉米纹枯病从苗期至穗期均可发生，危害高峰期在玉米子粒形成至灌浆充实期。该病主要危害叶鞘、叶片和穗部，也侵害茎秆。最初多由近地面的叶鞘发病，由下而上逐步发展。

Cornsheathblightcanoccurfromtheseedlingstagetotheheadingstage,andthepeakharmperiodisfromtheformationofcornkernelstothefillingstage.Thediseasemainlyharmsleafsheaths,leavesandears,andalsoharmsstems.Atfirst,thediseasemostlyoccursfromtheleafsheathneartheground,andgraduallydevelopsfrombottomtotop.

其症状为在叶片和叶鞘上形成典型的呈暗绿色水浸状的同心斑，大面积覆盖被侵染叶片和苞叶，形成不规则的云纹状病斑，中部灰褐色，边缘深褐色，随后病斑逐渐扩大，包围整个叶鞘直至叶鞘叶片干枯；病斑向上扩展至果穗基部，果穗停止发育并迅速发展至全穗，最后死亡。

Thesymptomsincludethattypicaldarkgreenwater-soakedconcentricspotsareformedontheleavesandleafsheaths,coveringtheinfectedleavesandbractsinalargeareatoformirregularmoire-likespots,withgrayishbrowninthemiddleanddarkbrownontheedges,andthenthespotsgraduallyexpandandsurroundthewholeleafsheathuntiltheleavesoftheleafsheathswither.Spotsspreadupwardtothebaseoftheears,whichstopdevelopingandrapidlydeveloptothewholeears,andfinally,theearsdie.;三玉米纹枯病绿色防控

III.GreenPreventionandControlofCornSheathBlight;三玉米纹枯病绿色防控

III.GreenPreventionandControlofCornSheathBlight;三玉米纹枯病绿色防控

III.GreenPreventionandControlofCornSheathBlight;（二）病原

多数研究者认为，玉米纹枯病的病原菌主