水稻條紋葉枯病的主要症狀是:田間早期發病株先是在心葉上出現黃色條紋,葉片呈紙撚狀下垂,然後枯死,形成所謂的“假枯心”。“假枯心”苗與蟲害造成的真枯心苗相似,但無蛀孔、無蟲糞、不易拔起。不同水稻品種症狀表現不一。糯稻、粳稻和高稈秈稻品種心葉黃白、柔軟、卷曲下垂,呈枯心狀;矮ai稈gan秈xian稻dao品pin種zhong沒mei有you枯ku心xin症zheng狀zhuang,心xin葉ye上shang出chu現xian黃huang綠lv相xiang間jian的de條tiao紋wen,分fen蘖nie減jian少shao,病bing株zhu提ti早zao枯ku死si。抗kang病bing品pin種zhong發fa病bing較jiao輕qing,一yi般ban隻zhi表biao現xian心xin葉ye褪tui綠lv或huo有you黃huang色se條tiao點dian,很hen少shao整zheng株zhu黃huang化hua死si苗miao,後hou期qi病bing株zhu能neng部bu分fen恢hui複fu。較jiao遲chi發fa病bing的de植zhi株zhu除chu葉ye片pian上shang有you黃huang色se條tiao紋wen外wai,還hai有you葉ye片pian發fa紅hong的de現xian象xiang。本ben田tian期qi發fa病bing植zhi株zhu明ming顯xian矮ai縮suo,葉ye片pian逐zhu漸jian枯ku黃huang,發fa病bing重zhong的de整zheng株zhu枯ku死si,不bu能neng抽chou穗sui;發病輕的生長受阻,雖能抽穗,但穗小而且畸形。水稻條紋葉枯病田間發病區域分布比較均勻。
7月上中旬我省大麵積生產上出現了水稻條紋葉枯病第一顯症高峰。該病症狀的典型特點是“心葉顯症,老葉健康”,即水稻發病後首先在心葉上出現褪綠或黃色條斑,進一步發展至整個葉片黃化、kusi,zuizhongzaochengsimiao,laoyezaidaozhufabingchuqirengbaochizhengchanglvse。shuidaozhenjunxingbinghaihuoshenglixingbinghaizhuyaoshilaoyexianfabing。zheshibianbieshuidaotiaowenyekubingyuzhenjunxingbinghaihuoshenglixingbinghaidezhongyaotezheng。zhuazhuzheyidian,zhuyijianzhazaoqibingzhu,jiunengqingsongbianbieshuidaotiaowenyekubing。
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