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root rot disease
相关语句
  根朽病
     The Larch root—rot disease (Armillariella mella (Vahl. ex Fr.)
     落叶松根朽病[Armillariella mellea(Vahl.ex Fr.)
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  相似匹配句对
     Root
     根
短句来源
     in root caries.
     结论:牙龈萎缩、菌斑指数、年龄是根龋发生的危险因素。
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     Qualitythe root of competitiveness
     质量是竞争力的源泉
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     Honestythe Root of Morality
     诚信——道德的立根之本
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     ON THE ROOT ROT OF SWEETPOTATO
     甘薯根腐病的初步研究
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A root rot disease of jute caused by Papulospora sp. hitherto not reported from this country was found to distribute in areas along both sides of Chientang River. During the years 1954 to 1959, 14.7 to 24.6 percents of the plants were attacked. The first symptom was the browning of roots and the basal part of stem. In the later stage of infection the conducting system of stem was also affected. The stem was broken and the plant withered in severe conditions. In late August, black sclerotial bodies...

A root rot disease of jute caused by Papulospora sp. hitherto not reported from this country was found to distribute in areas along both sides of Chientang River. During the years 1954 to 1959, 14.7 to 24.6 percents of the plants were attacked. The first symptom was the browning of roots and the basal part of stem. In the later stage of infection the conducting system of stem was also affected. The stem was broken and the plant withered in severe conditions. In late August, black sclerotial bodies appeared on the diseased portions.

1.黄麻根腐病为黄麻新的问题,目前了解的主要分布地区为浙江省沿钱塘江两岸的肖山、杭州市郊、原杭县等麻区。1954—1957年各地黄麻圆果种的平均发病率在14.7—24.6%以上。2.本病为害黄麻根及莖基等部分,使形成褐腐。病部不收缩,或微现收缩。后期病菌侵入输导组织,木质部形成黄褐色。8月下旬后,在病部出现大小约0.63×0.36毫米扁平不整形的黑色菌核,为本病的重要标志。3.本病以为害黄麻成株期为主。从6月下旬开始渐次出现病株,高峯期为8月下旬至9月下旬。在沙壤土中,地温(5厘米)平均在28—30℃,每旬降雨量在70毫米左右可以诱致严重发病。在一定温度下,雨量多少关系于发病程度极重要。4.经接种证实,本病为真菌Papulospora sp.所致,在病组织及普通培养基上不见分生孢子。生长发育以25—30℃为最适。矿物营养在缺碳时生长最差,缺氮时生长无大影响,迅速形成大量菌核;如加入蛋白腖,菌丝不复变色(白色),菌核不能形成。钾及磷对病菌生长发育的影响仅次于碳。5.含粘粒在10%以下的轻松土壤为最有利的发病环境。连作或轮作,对发病关系极为明显,多年连作地发病率较多年轮作或2—4年轮作地高7—53倍。6.笨麻主要...

1.黄麻根腐病为黄麻新的问题,目前了解的主要分布地区为浙江省沿钱塘江两岸的肖山、杭州市郊、原杭县等麻区。1954—1957年各地黄麻圆果种的平均发病率在14.7—24.6%以上。2.本病为害黄麻根及莖基等部分,使形成褐腐。病部不收缩,或微现收缩。后期病菌侵入输导组织,木质部形成黄褐色。8月下旬后,在病部出现大小约0.63×0.36毫米扁平不整形的黑色菌核,为本病的重要标志。3.本病以为害黄麻成株期为主。从6月下旬开始渐次出现病株,高峯期为8月下旬至9月下旬。在沙壤土中,地温(5厘米)平均在28—30℃,每旬降雨量在70毫米左右可以诱致严重发病。在一定温度下,雨量多少关系于发病程度极重要。4.经接种证实,本病为真菌Papulospora sp.所致,在病组织及普通培养基上不见分生孢子。生长发育以25—30℃为最适。矿物营养在缺碳时生长最差,缺氮时生长无大影响,迅速形成大量菌核;如加入蛋白腖,菌丝不复变色(白色),菌核不能形成。钾及磷对病菌生长发育的影响仅次于碳。5.含粘粒在10%以下的轻松土壤为最有利的发病环境。连作或轮作,对发病关系极为明显,多年连作地发病率较多年轮作或2—4年轮作地高7—53倍。6.笨麻主要是受不良环境影响的生理病态。在这种生长较衰弱的笨麻上最易遭病菌侵害而发生根腐病。所以笨麻中病株率极高,特别在病原菌大量积累的轮作地为甚。7.在接种或多年连作地上肥料施用不合理,可以导致发病而減产。油粕作为基肥有减轻发病的趋势,效果并不显著,但可视为对生物防治的一种启发。8.病组织中的菌核,在10及20厘米深度砂壤土,历时15个月以后,粘壤土11个月以后,即失去生活力;而放置土面的,在3年测定中仍具生活力。9.以人工接种法测定本病原菌对浙江省麻区主要作物寄主范围的结果,除黄麻圆果种为最主要寄主外,黄麻长果种、花生、苜蓿、洋棉、中棉、蚕豆等均可以不同程度的被感染。在自然情况下,黄麻长果种、花生、苜蓿等均可以被寄生而发病。10.严重病区或病地进行3年以上的轮作,深耕15厘米以上,同时清洁病地等措施都很必要,尤其在多肥(氮素30斤以上/亩,密植25,000株以上/亩)时更为重要。严重病地苜蓿必须在地温15℃以下即耕入土壤。

Since the extensive growing of the certain stem rust resistant varie-ties of wheat in northeastern provinces,the root rot disease caused byBipolaris sorokiniana became a new problem in wheat production.Thedisease occurs from the seedling stage to adult plants,and it is usuallyhighly epidemic in the later stage. B.sorokiniana has two biologic forms to be designated as H_1 and H_2respectively in the medium and H_1 is usually to be dominated.The pri-mary source of infection seems to be come from the seedborne...

Since the extensive growing of the certain stem rust resistant varie-ties of wheat in northeastern provinces,the root rot disease caused byBipolaris sorokiniana became a new problem in wheat production.Thedisease occurs from the seedling stage to adult plants,and it is usuallyhighly epidemic in the later stage. B.sorokiniana has two biologic forms to be designated as H_1 and H_2respectively in the medium and H_1 is usually to be dominated.The pri-mary source of infection seems to be come from the seedborne fungi andsoil infestation.The fungus has a wide host range.Isolates obtainedfrom the 29 species of grasses and cereals could infect wheat from theresults of the crossed inoculation test under green house conditions. High damages usually occur in the later stage of host growth.It isespecially true to be easily infected in the milky stage.The degree ofintensity by infection is promoted by favorable environmental factors. Although there are some varietal differences of resistance,none im-mune varieties would be expected as indicated by the results of artifi-cial inoculation under field conditions during 1955-1957.In comparativespeaking,the farmer's varieties and some semi-winter wheats seemed tohave a high degree of resistance,moreover,Triticum timopheevii also ishighly resistant to root rot. Finally the authors suggested that the combination of seed-treat-ment,rotation and use of the resistant varieties may minimize the disea-seto a certain extent.

东北春小麦根腐病Bipolaris sorokiniana(Sacc.ex Sorokin)shoem.是推广抗锈良种后出现的问题。苗期引起根腐,成株期发生叶斑、穗腐和黑胚粒。病菌有两种类型定名为H_1和H_2型,田间前者占优势。病种子和病株残体是田间发病的初侵染源,种子消毒和轮作可减轻苗期根腐并提高种子出苗率。根腐病菌寄主范围很广,来自29种禾本科杂草和作物上的菌株均能侵染小麦。温室和田间试验结果,小麦灌浆乳熟期发病对产量影响最大,也是形成黑胚粒时期。目前尚无免疫品种,农家种和半冬性品种比国外品种和硬粒小麦抗病,Triticum timopheevii表现高抗。采取种植抗病品种结合种子消毒、轮作、增施氮肥等综合防治技术是防治小麦根腐病的有效措施。

During 1978-1981, a kind of bacterium was isolated from diseased Sym-phytum officinale showing symptoms of wilt and root rot in Linan and Hangzhou, Zhejiang province. Comparative studies of the isolated bacterium with the one causing similar symptoms in tomatoes demonstrated that these two bacteria showed similar cultural characteristics, morphology, Gram's staining response, optimum temperature for growth and physiological and biochemical reactions. Cross-inoculation with the two bacteria were also successful.The...

During 1978-1981, a kind of bacterium was isolated from diseased Sym-phytum officinale showing symptoms of wilt and root rot in Linan and Hangzhou, Zhejiang province. Comparative studies of the isolated bacterium with the one causing similar symptoms in tomatoes demonstrated that these two bacteria showed similar cultural characteristics, morphology, Gram's staining response, optimum temperature for growth and physiological and biochemical reactions. Cross-inoculation with the two bacteria were also successful.The two bacteria were then injected separtely as antigens into rabbits, and two antisera were obtained. The agglutination tests with the two bacteria showed that when their respective antiserum was diluted with saline to the range of 1 : 1280-1 : 2560, the liquid was clear and shows a precipitate at the bottom. In further investigation of the relationships between the two bacteria, the antiserum from the bacterium in Symphytum officinale was first absorbed by the bacterium from tomato, and the antiserum from the bacterium in tomato was first absorbed by the bacterium in Symphylum officinale, when the two bacteria were then added to their treated, original antiserum solution, no further precipitate was observed.These results showed that the pathogenic bacterium causing wilt and root rot disease in Symphytum officinale is Pseudomonas solanacearum E,F,Smith,

我们于1978~1981年从浙江临安和杭州市郊等地聚合草枯萎烂根病株分离的细菌,将其培养性状、形态,革兰氏染色反应、生长适温、生理生化反应等性状,与番茄青枯病原细菌对比,其结果相似。两者并可交互接种。 以聚合草枯萎烂根病原细菌和番茄青枯病原细菌为抗原,按常规注射兔子,分别制得两个抗血清,其效价均在1280~2560之间。为了进一步明确两菌的亲缘关系,将两菌抗血清交互吸附后,再将两菌调换测定,都不能起凝集反应。 试验证明引起聚合草枯萎烂根病的病原细菌与茄科假单胞杆菌[Pseudomonas solanacearum(Smith)Smith]青枯病细菌相同。

 
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