《植物病虫害绿色防控技术》课件——二、水稻纹枯病绿色防控(双语）.pptx

;二水稻纹枯病绿色防控

GreenPreventionandControlofRiceSheathBlight;（一）症状识别SymptomIdentification

从秧苗期至穗期均可发生，以抽穗期前后发病最盛。主要为害叶鞘，也可为害叶片。叶鞘发病先在近水面处出现水渍状暗绿色小点，扩大后形成椭圆形或云纹形病斑。常几个病斑相互愈合成为云纹状大斑。

Thediseasecanoccurfromtheseedlingstagetotheheadingstage,andthediseaseismostcommonbeforeandaftertheheadingstage.Itmainlydamagesleafsheathsandleaves.Whentheleafsheathisattacked,water-staineddarkgreendotsappearnearthewaterareafirst,andthenexpandtoformovalormoirespots.Severalspotsoftencloseuptolargemoire-likespots.

;（一）症状识别SymptomIdentification

湿度大时，病部会出现白色的蛛丝状菌丝体，然后形成白色绒球状菌丝团，即为前期菌核；随着病程的发展，最后变成褐色的形似鼠粪状菌核。

Whenthehumidityishigh,whitearachnoidfilamentousmyceliumwillappearintheaffectedpart,andthenwhitepompon-likehyphaemasswillbeformed,whichistheearlysclerotium;withthedevelopmentofthedisease,itwillfinallybecomebrownmousefecal-likesclerotium.;病状Symptoms

病症

Symptoms

;水稻纹枯病诊断要点DiagnosticPointsofRiceSheathBlight

常发生在稻株的叶鞘及叶片上，病斑云纹状，边缘褐色，中央灰白色，后期在得病部位产生褐色鼠粪状菌核。

Itoftenoccursontheleafsheathsandleavesofriceplants,withmoire-likespots,brownedges,andgrayish-whitecenters.Inthelaterstage,brownmousefecal-likesclerotiaareproducedattheaffectedparts.

;（二）病原菌(II)PathogenicBacteria

无性态：半知菌亚门丝核菌属的立枯丝核菌

Asexuality:RhizoctoniasolaniofDeuteromycota

有性态：担子菌亚门亡革菌属的瓜亡革菌

Sexuality:ThanatephoruscucumerisofBasidiomycotina;稻纹枯病菌菌丝

Hyphaeofpathogensofricesheathblight

;诊断要点：病斑云纹状，后期产生鼠粪状菌核。

Diagnosticpoints:Thespotsaremoire-like,andmousefecal-likesclerotiaareproducedinthelaterstage.

;（三）发病规律OccurrenceRegularity

病菌主要以菌核在土壤中越冬，也能以菌核和菌丝在病稻草、田边杂草等其???寄主上越冬。水稻收割时大量菌核落入田间的土壤中，成为次年或下季水稻的主要初侵染源。

Thepathogensmainlyoverwinterinthesoilassclerotia,andcanalsooverwinterinotherhostssuchasdiseasedstrawandfieldweedsassclerotiaand