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病虫
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  disease and pest
    Preliminary study on the application of Excel in forecasting crop disease and pest
    Excel在病虫测报中的应用初探
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    Studies on the overall investigation and forecast techniques of rice disease and pest
    水稻病虫总体调查和预报技术探讨
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    The sort of forecast is disease, pest and the complex of disease and pest.
    分病害、虫害、病虫复合为害预测三类。
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    This paper reviewed the important progresses in research on the Integrated Pest Management (IPM) of rice since the 8th five year plan in China. These progresses mainly include the dynamics,key controlling measures and technical system of rice IPM. IPM has guaranteed the sustainable davelopment of rice production and is of importance to the future rice disease and pest control.
    本文报道从“八五”以来,我国水稻病虫害综合治理(IPM)研究在主要病虫动态规律,关键防治措施,综合治理技术体系等方面取得的重大进展,这些成绩保障了我国水稻生产的持续发展,对今后水稻病虫害防治具有极为重要的意义
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    The characteristics of the disease and pest occurance and their damage were analysed in this paper.
    并对林带病虫发生与危害特点作了初步分析。
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    The Survey of Forest Plant Quarantine Objects and Dangerous Diseases and Insect Pests and the Technical Research on Designation of Epedemic Areas in Quanzhou City
    泉州市森林植物检疫对象及危险性病虫(疫情)调查和疫区划定的技术研究
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    EVOLUTION OF MAIN AGRICULTURAL DISEASES AND PESTS CALAMITIES IN SHAANXI AND CONTROL WAYS
    陕西农业主要病虫灾害演变及控制途径
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    CATASTROPHE THEORY AND APPLICATION OF SOME MAIN PEST IN AGRICULTURE
    农业病虫危害的突变理论及应用
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    VARIETIES AND DISTRIBUTION OF THE PESTS AND DISEASES IN WATER CONSERVATION
    祁连山水源涵养林病虫种类、分布特点及防治对策
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    PROGRESS AND PROSPECT OF RICE PEST AND DISEASE INTEGRATED CONTROL IN GUANGXI
    广西水稻病虫综合防治的进展与展望
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  disease and pest
The vegetational diversity of peasant agriculture in Africa to which weeds make their contribution, helps to decrease the risk of disease and pest epidemics.
      
The ecological functions assessed in the study relate to six aspects: soil protection, water conservation, CO2 fixation, nutrient cycling, pollutant decomposition and disease and pest control.
      
Selecting a Peruvian sweetpotato core collection on the basis of morphological, eco-geographical, and disease and pest reaction
      
Resistance gene homologues in melon are linked to genetic loci conferring disease and pest resistance
      
Two mapping populations that segregate for several disease and pest resistance loci were used to map the RGH probes onto the melon genetic map.
      
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This paper reports the results of studies on the nuclear polyhedrosis virus-of the cotton bollworm Heliothis armigera.The virus was isolated in 1974 from dead boll-worms collected from cotton fields in Chinchow district of Hupeh Province.It was designated as VHA-273.It is observed that the polyhedra are hexagonal,pentahedron,cubical or irregular in shape,varying from 1.25 to 5.0 p in diameter.Serious pathological changes were in the fat-body,epidermis,tracheal matrix and other tissues of the diseased insects...

This paper reports the results of studies on the nuclear polyhedrosis virus-of the cotton bollworm Heliothis armigera.The virus was isolated in 1974 from dead boll-worms collected from cotton fields in Chinchow district of Hupeh Province.It was designated as VHA-273.It is observed that the polyhedra are hexagonal,pentahedron,cubical or irregular in shape,varying from 1.25 to 5.0 p in diameter.Serious pathological changes were in the fat-body,epidermis,tracheal matrix and other tissues of the diseased insects and the former two seemed to be the most susceptible tissues.The muscle bundles were not affected.Our bioassay showed that the susceptibility of the larvae to the NPV varied with dosage,larval instar and temperature.The first and second instars were the most susceptible stages;and their mortality rates at 1×106 PIBs/ml were 85% and 80% and the time lasting were 6 and 8 days respectively.Larvae of fifth and sixth instars were not so susceptible,especially when the temperature exceeded 33℃.Cross infections of the NPV with tobacco budworm,Heliothis assulta,was susccessful.In 1975,from July to September,field tests with the NPV to control bollworms were made in cotton fields about 102 mil's at Kung-an County of Hupeh Province.The concentrations used were 1.5×1010 PIBs/mu,3×1010 PIBs/mu and 6×1010 PIBs/mu.The results showed that the NPV was better than the chemical insecticides 1605+DDT.Combined use of the NPV with dilute sevin and Bacillus thurin-giensis suspensions were also tested;and the results were either better or as effective as the NPV or sevin used alone.The application of the NPV VHA-273 to control bollworms in the field seems promising.

自1973—1974年以来,在湖北荆州地区微生物站筛选出一批棉铃虫病毒毒株,其毒力均为80%以上,有的高达100%。其中毒力较强而又比较稳定的VHA-273,经病虫组织切片观察,确定其为核多角体病毒。1974—1975年除对棉铃虫病毒病的组织病理变化作了初步观察外,又继续在室内外对病毒的毒力、剂量与虫龄、温度的关系,及寄主饲料对病毒产量的影响等,进行了一系列的试验,并用VHA-273生产部分病毒,为大田防治试验作了准备。 1975年7—9月,用VHA-273生产的病毒,在湖北公安县雷州公社约102亩的早发棉田进行示范试验,对第2代及第4代棉铃虫的防治效果,先后调查了5次,最后对试验田、对照田及邻田又作了天敌调查,结果均表明试验田的虫口下降率,花、蕾及青铃受害率等,均低于1605+DDT及西维因的对照田,为棉田的生物防治提供了有希望的微生物农药。 VHA-273棉铃虫核多角体病毒,对烟青虫的毒力很强,对两种害虫能交叉感染。因此,它可用于烟青虫的防治。

The data of the ecological factors and the peak periods of incubation of yellow rice borer (Try potyza incertulas) observed in Tongan, Fujien province have been calculated through the computer (TQ16). The result shows that the main factors related with the peak periods of incubation of this insect in their first generation depend chiefly on the number of days where the average temperature per day is not less than 15℃, while the relative humidity is equal to or over 80 percent.The two highest correlation coefficents...

The data of the ecological factors and the peak periods of incubation of yellow rice borer (Try potyza incertulas) observed in Tongan, Fujien province have been calculated through the computer (TQ16). The result shows that the main factors related with the peak periods of incubation of this insect in their first generation depend chiefly on the number of days where the average temperature per day is not less than 15℃, while the relative humidity is equal to or over 80 percent.The two highest correlation coefficents are R6 = 0.88592 and R7 = 0.88291. Using two formulae, formula 6 and 7, to forecast the peak periods of incubation in 1979, the gap between theory and practice is less than one day.

根据同安县病虫测报站16年的水稻三化螟化蛾高峰期和当地生态因子的资料,通过自编二元回归的Algol语言的程序,就上述二者的相关性进行电子计算机(TQ16)试算,结果表明:影响三化螟化蛾高峰期的主要因子是大寒至春分的日均温大于15℃的天数和相应的温度时相对湿度大于80%的天数.而最适公式(公式6和7)的复相关系数达0.88592和0.88291。经同1979年实际剥查结果和上述经验公式计算结果相比较,二者相差小于±1天, 本文主要从方法上进行探讨,计算结果表明,此法是可行的。

A midgut nuclear polyhedrosis virus was isolated from a camphor sawfly Mesoneura rufononta (Rohwer) . The diseased insect showed a sympton of losing appetite and thus becoming slow in motion. After infection the color of the larva's body turned from dark green to faint yellowish brown. The diseased larvae became flaccid, but the skin didnot become fragile.After being infected, the larva usually died in 4 - 6 days. It was observed that the virus-infected larva generally discharges a kind of dark-fluidl through...

A midgut nuclear polyhedrosis virus was isolated from a camphor sawfly Mesoneura rufononta (Rohwer) . The diseased insect showed a sympton of losing appetite and thus becoming slow in motion. After infection the color of the larva's body turned from dark green to faint yellowish brown. The diseased larvae became flaccid, but the skin didnot become fragile.After being infected, the larva usually died in 4 - 6 days. It was observed that the virus-infected larva generally discharges a kind of dark-fluidl through anus, with which the moribund larva might stick to the plant.By the study in the SEM , the inclusion bodies were demonstrated to be a shape of pentagonal or hexagonal polyhedron and measure 0.6-1. 0 μm in size. The examination of an ultrathin section of the midgut NPV inclusion revealed a pattern of regular dots and rows. The lattices of the polyhedra were shown to have a spacing of 50A between the centers of them. The virus particle is of an usual rod shape and measures 227×71nm in size.

本文报道了樟叶蜂幼虫的一种病毒病。病毒只在寄主中肠组织中细胞核内复制,故称为肠型核多角体病毒病而有别于鳞翅目昆虫中核多角体病毒病。病虫肛门流出粘液,粘液干后,幼虫尾部就粘附在基质上。因此,感病晚期或已死的幼虫其躯体则头部往下而悬垂于枝、叶上。感病初期,幼虫行动呆滞、食欲不振,体色由正常的绿色逐渐变为棕褐色。 多角体在扫描电子显微镜下观察,为五边形或六边形的多角体,大小0.6—1.0μm,在超薄切片中,多角体的晶格为点线型,点间距为50A,病毒粒子杆状,大小为227×71nm。

 
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