共查询到19条相似文献,搜索用时 93 毫秒
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阐述了绥化市2006年水稻稻瘟病发生情况。介绍了在绥化市常见的、危害重的叶瘟、节瘟、穗颈瘟的发病症状。从品种的抗病性、栽培管理、气候等方面分析了稻瘟病的发病原因,并提出综合防治措施。 相似文献
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阐述了汤原县稻瘟病发生危害概况,分析总结了近两年发生原因及特点,据此,提出了全程控制,超前预防的防治对策,旨在为今后有效预防稻瘟病发生起到一定的指导作用。 相似文献
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稻瘟病是水稻主要病害之一,在晋安区北峰单季稻上连年发生,分布广,危害重,而再生头季稻上的稻瘟病又比单季中晚稻重。据田间考察,再生稻头季稻稻瘟病发生面积占播种面积23%~48.4%,与单季稻相比要高出24.2%。经过多年的实践调查分析,再生稻稻瘟病发生严重原因与防治对策简述如下:1发生特点发生早、流行期长、为害重。据调查5月上中旬稻叶瘟始见。5月中旬到6月下旬流行,7月中旬田间穗颈瘟普遍发生。田间发病中心多,叶病率23,4%~50.7%,病情指数17%~50%以上,部分田国苗瘟严重而枯死。穗病率(粒瘟、枝梗瘟、穗颈瘟)达… 相似文献
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阐述葫芦岛地区水稻生产现状,分析水稻生产存在品种杂乱、育苗技术落后、施肥不均衡、病虫害防治水平低、灌水不科学等主要问题。提出了今后水稻产业发展的对策,重点是筛选品种、提高育苗技术、均衡施肥、加强病虫害防治、实行科学灌水等。 相似文献
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介绍了黑龙江省绿色水稻生产现状,指出黑龙江省目前存在的农业生态环境日趋恶化、绿色食品水稻生产规模小而分散、农业生产资料市场混乱、绿色优质水稻难优价等问题,并根据问题提出了黑龙江省绿色水稻生产的对策。 相似文献
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分析了2004年新城子区稻苗立枯病发生原因,提出防治立枯病应在床土杀菌、调酸的基础上,适温炼苗,早炼苗,炼小苗和适时补水。 相似文献
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Rice blast disease is one of the obstacles of rice production not only in Japan but throughout rice producing countries. The effects of fan-forced wind on the incidence of rice blast disease were studied in two successive seasons. Electric fans (5 KW, 110-cm blade diameter) set on the ridge of paddy fields at a height 5 m from the ground level were used to artificially generate wind. In season 1, the fan operated twice daily for 30 min periods at 11:00 pm and 4:00 am from June 15 to September 1. The blocks of the paddy fields were divided into 6 zones according to wind speed and distance from the fan. The wind speed ranged from 2.0 to >7.3 m/s. The incidence of both rice leaf and panicle blast was significantly lower in the zones receiving wind between 2.6 and 7.3 m/s; however, the zone that received a velocity >7.3 m/s was severely affected by leaf and panicle blast. The zone that received the a wind speed of 2.6 m/s or lower exhibited an inefficient reduction of leaf and panicle blast disease, but it was better than in the control fields. In season 2, a wind-forced fan was applied from June 16 to September 9, with the velocity adjusted between ca. 3.0 and 6.0 m/s. The incidence and severity of leaf and panicle blasts (chuff, rachis-branch and neck blast) were efficiently reduced in the wind-treated fields. Fan-forced wind was more effective than the application of conventional chemical fungicides for controlling rice blast disease. These data demonstrate the potential of fan-forced wind for controlling rice blast disease. 相似文献
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根据已知NBS-LRR类抗病基因结构中氨基酸的保守区域设计简并引物,对水稻不育系系谱NBS-LRR类抗病基因同源序列进行克隆、测序和聚类。同源序列克隆与分析表明,7个水稻不育系系谱亲本中共获得14个阳性克隆,其中11个含有NBS-LRR类抗病基因所特有的保守氨基酸结构域KinaseⅠ、KinaseⅡ、KinaseⅢ及跨膜区域。这些片段间同源性最高达98.3%,最低仅为29.7%;11个氨基酸片段与抗病基因Xal(AB002266)的同源性较高,42%-45%的氨基酸序列相同,59%-64%的氨基酸序列相似,且与水稻其他NBS-LRR类抗性蛋白相似性很高。通过聚类分析,可以将其分为3类,分别记为G1、G2、G3,并发现抗源谷农13所含有的G3类基因,通过天谷、福伊传给后代谷丰、全丰。 相似文献