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rust epidemics
相关语句
  锈病流行
     Studies on the prediction of wheat stripe rust epidemics in Hanzhong District of Shaanxi Province
     汉中地区小麦条锈病流行程度预测研究
短句来源
  相似匹配句对
     REGIONAL EPIDEMICS OF STRIPE RUST ON BARLEY AND WHEAT IN TIBET
     西藏大、小麦条锈病区域流行规律
短句来源
     Preliminary Report on the Effect of Sunspot's Activity on the Epidemics of Wheat Strip Rust
     太阳黑子活动对小麦条锈病流行的影响
短句来源
     Hawthorn-juniper rust
     山楂圆柏锈病的研究
短句来源
     If I Rest, I Rust
     如果我休息,我就会生锈
短句来源
     THE MATHEMATICAL MODEL OF HEPATITIS B WITH ITS EPIDEMICS
     乙型肝炎流行病学数学模型
短句来源
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  rust epidemics
The overall mean leaf rust epidemics varied from area under disease progress curve (AUDPC) of 86 to 1,835.
      
A simulation model for the development of brown rust epidemics in winter wheat
      
The growth of leek rust epidemics during the early stage of the epidemic in isolated plots was satisfactorily described by an exponential model.
      
The growth of leek rust epidemics in time under favourable conditions in three leek cultivars during two years was analysed.
      
Growth of leek rust epidemics in time in three cultivars during the early stage of the epidemic
      
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In this paper, the informations about fore casting wheat rust were collected and reviewed, the methods and techniques for investigating and forecasting wheat rust were especially explanated The writer suggests that by means of timely observations and inspoctions on the wheat rust development deuring autumn and on the amount of the survival after over—Wintering along with the weather forecasting data, if is possible to marKe fairly accurate forecast of wheat rust epidemics in Hubei Province.

本文搜集了国内外有关小麦锈病预测预报的资料,并作了评述。着重介绍病害调查和预测预报的方法技术。

The sunflower rust epidemic was modelled with fuzzy multifactoral evaluation.The second,and last ten days precipitations on May and/or Jun were selected as the forecasting factors.Fiveteen samples analyzed for Westen Region of Inner Mongolia.Correctness,is 70%.

本文选用了5月中下旬、6月中下旬的降雨量和锈病越冬菌量作为预测因子,用模糊综合评判建立预测模型。选用1983—1989年呼和浩特市、土右旗和临河市三个地区的病害流行状况(15个样本)作为建模基础资料。预测准确率70%。

Investigation on the epidemic forecast of new race of wheat stripe rust (Puccinia striiformis West.) was carried out during 1986-1990 through determination of the pathogen pathogenicity and the relative parasitic fitness, analysis of the virulent genes. and survey of the deployment of the commercial varieties. The new race CYR-29 was firstly discovered in 1985. In 1987, the frequency of this race was only 9.5%, while the dominant race CYR-25 was 19.3%. By means of analysing the feature of CYR-29...

Investigation on the epidemic forecast of new race of wheat stripe rust (Puccinia striiformis West.) was carried out during 1986-1990 through determination of the pathogen pathogenicity and the relative parasitic fitness, analysis of the virulent genes. and survey of the deployment of the commercial varieties. The new race CYR-29 was firstly discovered in 1985. In 1987, the frequency of this race was only 9.5%, while the dominant race CYR-25 was 19.3%. By means of analysing the feature of CYR-29 with more extensive range of pathogenicity to some wheat varieties, wider spectrum of the virulent gene, higher value of the relative parasitic fitness to the important commercial varieties and larger area of the breeding varieties (up to 70 million mu), it was predicted that CYR-29 would become the dominant race in 1987. It was demonstrated that the prediction was identical with the results of race identification in 1988. Based upon the fact that the frequency of CYR-29 was 40.3%, and the area of its infected varieties was more than 100 million mu, and there was a large amount of inocula in autumn seedling stage and suitable condition of weather in 1990, it was accurately predicted that wheat stripe rust would occur on a large scale in that year, which provided scientific basis for breeding resistant varieties, reasonable overall arrangement of varieties and long-term forecast of stripe rust epidemic, and also had a great significance in terms of theory and practice for wheat stripe rust control.

1986-1990年,采用病菌致病性测定、毒性基因分析、相对寄生适合度测定和品种布局调查等方法,对小麦条锈菌新小种流行预测进行研究。结果指出:1987年,与流行小种25号(19.3%)相比,1985年新发现的小种29号的出现频率仅9.5%,但它的致病范围广、毒性基因谱宽、相对寄生适合度值高、哺育品种面积达7000万亩,预测29号小种将发展为主要流行小种,这与1988年鉴定结果为优势小种(28.0%)完全一致。1990年基于条中29号频率达40.3%,感病品种面积超过1亿亩,秋苗菌源多和气候条件适宜等因素,对该年条锈病大流行做了准确预报。为抗病育种、品种布局和条锈病流行的长期测报提供了科学依据。这在理论和实际上都有重大意义。

 
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