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major factor
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  主导因子
    The cumulative action of effective temperatures above the developmental threshold ( 15℃) during the borer's overwintering period was a major factor affecting diapause termination in the borer. The total effecive temperatures for the borer population were about 267.5 day-degrees.
    15℃以上的有效温度的累积作用是滞育解除的主导因子,其群体临界有效积温约为267.5日度。
短句来源
    Study on influence of ecological factors on control of Dendrolimus punctatuswith Beauveria bassiana resulted that relative humidity in stand was the major factor on controlof Dendrolimus punctatus with Beauveria bassiana, not the temperature.
    研究结果表明,在生产应用中,林分的相对湿度是影响白僵菌防治松毛虫效果的主导因子,而温度不是主要制约因素。
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  “major factor”译为未确定词的双语例句
    lt was also found that the concentration of K+ was major factor influencing the variation of electroconductibility in C. equisetifolia, while the water, the concentration of Ca++, Mg++ and the increasing activity of polyphenol oxidase were minor factors.
    数理分析还表明,K~+离子浓度是影响木麻黄株电导率变化的主导因素,而水分、Ca~++,Mg~++离子浓度和多酚氧化酶活性的增加也有一定的相关。
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    The results showed that PGPR CH1 could enhance the surviving seedling of cucumber, control efficacy reached 78.64% after CH1 treatment at 28 d, which indicated that induced resistance was the major factor for CH1 to control the cucumber damping-off.
    结果表明,促生菌CH1提高了黄瓜的成苗率,处理后的28d,猝倒病相对防效高达78.64%,推测促生菌CH1使黄瓜产生的诱导抗性是其防病的主要原因。
短句来源
    In contrast to the natural conditions, under the long photoperiod condition in summer, high temperature is the major factor that induces emigration,while in autumn when the temperature is relatively low,short photoperiod becomes the dominent factor in inducing emigration.
    对照自然情况,夏季长光照条件下,高温是诱发迁出的主导因素,而在秋季降温条件下,短光照是诱发迁出的主导因素。
短句来源
    In house flies,the oxida-tive metabolism,a major factor of resistance in many kinds of pyre-throid resistant insects,reduced(17% to 48%).
    同时,家蝇对氰戊菊酯的氧化代谢速率降低(17—48%)。
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    The increase of the speed of membrane lipid peroxidation might be the major factor accelerating the death of the host's cells and stimulates the development of the disease.
    因此 ,松材线虫病的发生和发展与寄主植物组织的膜脂过氧化作用有关
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  major factor
The structure of the compounds was a major factor determining the degree of sorption.
      
Endogenous inhibitors of angiogenesis are proved to be a major factor preventing the emergence of clinically manifested stages of human cancer.
      
It was concluded that the molecular mobility is the major factor determining the electron transport properties of the systems of interest.
      
As a rule, complexonates are much more effective them the corresponding acids; if the complexing agent is fixed, then the stability constants (Ks) of the complexes become the major factor.
      
The French-Russian cooperation in radiochemistry actively develops today and is a major factor in the progress of this science and nuclear industry in these two countries.
      
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The tobacco aphid or peach aphid is a major insect pest of tobacco in Shuichang,Honan.This work was carried out during 1953-1958.The first part of this paper considers in detailthe annual cycle,which comprises 3 generations on the peach tree,15-17 generations on tobaccoand 4-6 generations on cabbage.The winged migrants,migranting from cabbage to peachtree,are the sexsuaparae which produce the oviparous females only.The males are born fromthose produced on cabbages.The second part deals with the host plants...

The tobacco aphid or peach aphid is a major insect pest of tobacco in Shuichang,Honan.This work was carried out during 1953-1958.The first part of this paper considers in detailthe annual cycle,which comprises 3 generations on the peach tree,15-17 generations on tobaccoand 4-6 generations on cabbage.The winged migrants,migranting from cabbage to peachtree,are the sexsuaparae which produce the oviparous females only.The males are born fromthose produced on cabbages.The second part deals with the host plants and the annualmigrations of the aphid among such hosts.The stem mother could survive only on the peachtree,although overwintering eggs were also found on many other fruit trees.The aphid passesthe winter(as both adult and nymphs)on several species of winter cabbages and weeds butthose from-cabbages possess,no more vitality on tobacco,when migration takes place.The fluctuations in population are dealt with in the third part.A considerable amountof quantitative data are handled to analyse the relations to various major factors.The favour-able range of temperature is 7-29℃,and temperatures below 6℃ or above 30℃ are severeto multiplication.The combined action of both temperature and humidity is even more im-portant.It was found that the 5-day average of temperature above 26℃ and of relativehumidity over 80%,or temperature above 30℃ or below 6℃ and relative humidity below40% decisively depressed the aphid population.The appearance of winged forms on peachtree is another factor favoring the population of the aphid in tobacco field.According to thecultural practice,top leaves and side branches of the tobacco plants should be pruned threetimes each year,colonies of the aphids inhabiting on those leaves and shoots are greatlydiminished thereby.During the unfavorable season,there appear aphids of“minute form”which possess lesser capacity of fecundity and their population simultaneously becomes smaller.The last part gives the result of a detailed study on control measures.Among various in-secticides tested,E1059 gives very good result in controlling the tobacco aphid and withoutresidual toxicity to higher animals.However,for eliminating the ravage of tobacco aphid,a systemic programme which comprises Chemical,biological and cultural control measures isrecommended.

菸蚜研究是1953—1961年在许昌进行的。一年之中,菸蚜的生活周期,春季在桃树上只有3代(包括干母代);在菸草上最多可繁殖15—17代;在白菜、萝卜等十字花科蔬菜上最多可繁殖5—6代。各代平均发育期:干母27天,干雌11天,春季迁移蚜17.4天;在菸草上各代平均7.9天;在白菜上各代平均8.3天,性母13天,产卵性雌蚜约21天。同时观察发现秋季从十字科蔬菜迁往桃树的有翅蚜本身就是性母,在桃树上只能产生产卵性雌蚜,雄岈则是从十字花科蔬菜迁往桃树的。关于寄主植物,菸蚜虽然经常在多种果树上产越冬卵,但干母除可在桃树上成活外,在其他树上的则全部死亡。此外,菸岈的孤雌胎生成蚜和若岈亦可在十字花科蔬菜上越冬,但次年大都不能再在菸草上成活。菸蚜适宜的温度范围为7—29℃,当5日平均气温低于6℃或5日平均相对湿度低于40%时,菸蚜数量均表现下降;温度与湿度对菸蚜消长有综合作用,当5日平均气温达26℃以上、相对湿度达80%以上时,数量亦表现下降。有翅幼蚜的大量出现,常是该寄主菸蚜数量下降的标志;同时有翅蚜的迁来,也常是该作物受菸蚜为害的起点。由于菸蚜喜集中在菸株幼嫩部分为害,所以菸株打顶和经过3—5次的打杈,常可除去部分菸蚜...

菸蚜研究是1953—1961年在许昌进行的。一年之中,菸蚜的生活周期,春季在桃树上只有3代(包括干母代);在菸草上最多可繁殖15—17代;在白菜、萝卜等十字花科蔬菜上最多可繁殖5—6代。各代平均发育期:干母27天,干雌11天,春季迁移蚜17.4天;在菸草上各代平均7.9天;在白菜上各代平均8.3天,性母13天,产卵性雌蚜约21天。同时观察发现秋季从十字科蔬菜迁往桃树的有翅蚜本身就是性母,在桃树上只能产生产卵性雌蚜,雄岈则是从十字花科蔬菜迁往桃树的。关于寄主植物,菸蚜虽然经常在多种果树上产越冬卵,但干母除可在桃树上成活外,在其他树上的则全部死亡。此外,菸岈的孤雌胎生成蚜和若岈亦可在十字花科蔬菜上越冬,但次年大都不能再在菸草上成活。菸蚜适宜的温度范围为7—29℃,当5日平均气温低于6℃或5日平均相对湿度低于40%时,菸蚜数量均表现下降;温度与湿度对菸蚜消长有综合作用,当5日平均气温达26℃以上、相对湿度达80%以上时,数量亦表现下降。有翅幼蚜的大量出现,常是该寄主菸蚜数量下降的标志;同时有翅蚜的迁来,也常是该作物受菸蚜为害的起点。由于菸蚜喜集中在菸株幼嫩部分为害,所以菸株打顶和经过3—5次的打杈,常可除去部分菸蚜,使菸蚜数量下降。在不适宜的条件下,菸株上常出现“小型蚜”。在防治方法方面,测定了几种药剂治蚜的药效,以 E 1059较为良好,并经测定菸叶对人并无残毒;防治菸蚜必须采用综合措施,参、春在桃树上防治菸蚜尤为重要。

A marked seasonal reproductive diapause has been observed in the rice leaf roller in all the outbreak regions in China. The occurrence of reproductive diapause coincides with the seasonal emigratory periods in different regions. In this experiment, investigations were carried out under artifitial simulant conditions to explore the ecological signals that may induce seasonal reproductive and migration with a view to the forecasting of migration. Tests on the three factors—temperature, photoperiod, and food—including...

A marked seasonal reproductive diapause has been observed in the rice leaf roller in all the outbreak regions in China. The occurrence of reproductive diapause coincides with the seasonal emigratory periods in different regions. In this experiment, investigations were carried out under artifitial simulant conditions to explore the ecological signals that may induce seasonal reproductive and migration with a view to the forecasting of migration. Tests on the three factors—temperature, photoperiod, and food—including eight treatmentes were carried out in 1980. The results were as follows:1. In all the treatments, food showed no significant effect on the reproductive diapause and migration. However, so far as the mean developmental speed of the female ovaries is concerned,that in the females feeding on rice plants in the heading stage was a little slower than that in the individuals feeding on rice plants in the tillering stage.2. Short photoperiod and high temperature were found to be the key factors in inducing reproductive diapause and emigration, and the two factors conditioned each other.In contrast to the natural conditions, under the long photoperiod condition in summer, high temperature is the major factor that induces emigration,while in autumn when the temperature is relatively low,short photoperiod becomes the dominent factor in inducing emigration.

稻纵卷叶螟在我国各发生区域内都有明显的季节性生殖停滞现象,而这种生殖停滞的时期也正在与各区域内季节性迁出的时间相吻合。本文是在人工模拟条件下,探索引起这种季节性生殖停滞或迁飞的生态信息,以期达到予测迁飞的目的。 在1980年进行了温度、光照周期、食料条件三个因素的8个处理的试验,结果表明: 1、无论在什么处理下,食料对生殖仃滞或迁飞均无显著影响。虽然从卵巢发育的平均速度来比较,取食抽穗期水稻的个体卵巢发育稍慢于取食分蘖期食料的。 2、各处理下的分析表明,短光照和升温是诱发生殖仃滞或迁飞的主导生态因子,二者并有相互制约的效应。 对照自然情况,夏季长光照条件下,高温是诱发迁出的主导因素,而在秋季降温条件下,短光照是诱发迁出的主导因素。

All the researchers in different provinces and autonomous regions unanimously reported that climate is one of the major factors which exercise an important influence on Dendrolimus punctatus walker.

作者在前人分省区研究气候因素对马尾松毛虫(Dendrolimus punctatus walker)发生影响的基础上,采用逐步回归、判别分析等方法,通过电子计算机分析多省区的大区域气候对马尾松毛虫种群发生的影响。从中看出,不同地理区域内、不同气候状况下,马尾松毛虫的发生是有规律变化的。特别是随不同纬度及其所引起的气候(主要是气温、降水量、相对湿度等)的差异而变化。根据上述分析的结果,并结合纬度、海拔、昆虫区系、马尾松毛虫发生世代、马尾松地理类型等因子,作者将我国马尾松毛虫的发生地区划分为三个类型区,以期有助于马尾松毛虫种群数量消长趋势的测报和森林昆虫区系等生态学特性的研究。

 
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