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1、http://www.tslqmy.com/http://www.sdxjks.cn/http://www.tshyqs.com/http://www.taqczl.com/南方水稻黑条性矮缩病的发生及防治技术 1 南方水稻黑条性矮缩病的发病症状Article1blacksouthernricedwarfvirusdiseasesymptoms 水稻各个生育期均可感病，但不同生育期的稻株感病后表现症状有所不同：Riceeachgrowthperiodweresensible,butindifferentgrowthperiodo
2、friceplantsinfectedafterthesymptomisdifferent: 1.1 典型症状 发病植株明显矮缩，根系不发达，须根少而短，严重时根系呈黄褐色；叶色深绿，剑叶或上部叶的叶面可见凹凸不平的皱折；叶背及茎秆表面有蜡点状、纵向排列成条形的瘤状突起，早期是乳白色，后期是褐黑色；病株节部有倒生须根及高节位分枝。1.1typicalsymptomonsetplantsignificantlyshortshrinkage,rootdeveloped,fibrousrootislittleandshort,seri
3、ouswhenyellowish-brownroot;Sword,darkgreenleavesandupperleavesadaxiallyvisibleunevenbuckling;Backandstemsurfacewaxwithdot,longitudinalstriparearrangedinacalyxtumor,earlyisivory,islatebrown-black;Strainsectionofrawfibresandhighsectionofabranch.http://www.tslqmy.com/htt
4、p://www.sdxjks.cn/http://www.tshyqs.com/http://www.taqczl.com/ 1.2 苗期症状 病株颜色深绿，心叶抽出缓慢，心叶叶片短小而僵直、深绿，叶脉有不规则蜡白色瘤状突起，后变成黑褐色。叶枕间距缩短，其叶鞘被包裹在下叶鞘里，植株严重矮缩（株高不及正常株的1/3），不能拔节，重病株常早枯死亡。1.2straincolordarkgreenseedlingsymptoms,heartleaftakeoutslowly,heartundershortandrigidity,dark
5、green,YeMaiyouirregularwaxwhitenodular,afterbecomedarkbrown.Pulvinusdistanceshortened,itsleafsheathwaswrappedintheleafsheath,seriousplantdwarfvirus(plantheightlessthan1/3ofthenormalstrains),notelongatingstage,severestrainsoftenearlywitheredtodeath. 1.3 分蘖期限症状 病株分蘖增多丛
6、生，上部数片叶的叶枕重叠，心叶从下叶鞘而出或从下叶枕口呈螺旋状伸出，叶片短而僵直、皱折，叶尖略有扭曲畸形。植株矮小，主茎及早生分蘖尚能抽穗，但穗头难以结实，或包穗，或穗小[1]。1.3tilleringperiodsymptomstrainincreasetillering,upperleafofpulvinusoverlap,leavesfromtheleafsheathandleafpillowunderorfromspiralingoutofmouth,shortandrigidblade,buckling,tipsligh
7、tlydistorteddeformity.Plantsmall,mainstemisbornearlytilleringtohttp://www.tslqmy.com/http://www.sdxjks.cn/http://www.tshyqs.com/http://www.taqczl.com/heading,butIcan'tstrong,earorpackagetheear,ortheearsmall[1]. 1.4 抽穗期症状 全株矮丛生，有的能抽穗，但抽穗不完全，抽穗迟而小，实粒少，粒重轻，剑叶短小僵直，在中上部叶片
8、可见纵向皱折；在茎秆下部节间和节上可见蜡白色或黑褐色隆起的短条脉肿。根系不发达，须根少而短，严重时根系呈黄褐色。1.4fullheadingstagesymptomplantdwarf,somecanbeearing,butearing,incom
