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    Molecular Markers for Lr37, Lr44 Based on AFLP and Detection of Wheat Leaf Rust Resistance Genes in 124 Wheat Cultivars (Lines)
    Lr37、Lr44AFLP分子标记及124个小麦品种(系)抗锈基因鉴定
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    Molecular Mechanism of Pathogenicity of Tomato Yellow Leaf Curl China Virus and Viral Satellite DNA Induced Gene Silencing
    中国番茄黄化曲病毒(TYLCCNV)致病分子机理及其卫星DNA诱导的基因沉默研究
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    Isolation and Identification of Promoters from Tomato Yellow Leaf Curl China Virus and Its Associated Satellite DNA
    中国番茄黄化曲病毒(TYLCCNV)及其卫星DNA的启动子鉴定
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    The Morphology of the Citrus Leaf Miner ( Phyllocnistis ciirella Stainton)and Its Food Plants in Kwangtung Province
    柑桔潜蛾(Phyllocnistis citrella Stainton)的形态及其寄主植物
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    A STUDY ON ECOLOGICAL MECHANISM OF THE MIGRATION OF RICE LEAF ROLLER CN APHALOCROCIS MEDINALIS GUENEE
    稻纵卷螟迁飞的生态机制研究
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    Effects of 2,4-D and Ethfel on Elongation Growth and Properties f Cell Wall of Maize Leaf Under Osmotic Stress
    渗透胁迫下2,4-D和乙烯利对玉米叶片延伸生长及细胞壁性质的影响
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    When the fungicides were applied on the leaf base but the pathogen was inoculated on the untreated leaf tip,the protective efficacy of azoxystrobin,carbendazim and thiram for controlling haricot bean leaf blight were 87.81%,42.09% and 7.24%,respectively;
    在叶片基部施药后在顶部接种,嘧菌酯、多菌灵和福美双对扁豆纹枯病的防治效果分别为87.81%、42.09%和7.24%;
短句来源
    when the fungicides were applied on the abaxial (lower) leaf surface but the pathogen was inoculated on the untreated adaxial (upper) surface,the protective efficacy of azoxystrobin,carbendazim and thiram were 87.30%,37.00% and 16.15%,respectively.
    在叶片背面施药后在正面接种,3种药剂对扁豆纹枯病的保护效果分别为87.30%、37.00%和16.15%。
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    In addition, with the dose of sample of A. philoxeroides increasing, the inhibition rate against the root growth of lettuce enhanced significantly, and the values were 54%, 61% and 83% under the treatments of 10 mg, 30 mg and 50 mg leaf of A. philoxeroides, respectively.
    随着样品用量增加,空心莲子草对莴苣根长的抑制率显著提高,其50mg叶片处理对莴苣根长的抑制率为83%,显著高于10mg处理的54%和30mg处理的61%。
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    The SCMV(Sugarcane mosaic virus) CP(Coat protein) gene was cloned from maize leaf with maize dwarf mosaic symptom by RT-PCR method.
    采用RT-PCR法,从表现玉米矮花叶病症状的玉米叶片中克隆了外壳蛋白(Coat protein)基因。
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    Biological Polymorphism and Physiological Differentiation Mechanism of Cercospora Zeae-maydis in Gray Leaf Spot of Maize
    玉米灰斑病菌(Cercospora zeae-maydis)生物学多态性与生理分化机理研究
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    Physiological Differentiation and Molecular Biology of Curvularia Lunata in Maize Leaf Spot
    玉米弯孢叶斑病菌生理分化及分子生物学研究
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    Methods of labelling the bacterial leaf blight organism of rice with radioisotope p~(32)
    同位素 P~(32)标记水稻白叶枯病细菌的方法
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    Control of grounanut leaf rust with a mixture of Di-xiu-na and colloidal sulfure
    敌锈钢(对氨基苯磺酸钠)的研究——Ⅰ.敌锈钠与胶体硫混用在田间防治花生锈病和叶斑病的效果
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    XANTHOMONAS ZINGIBERICOLA N.SP.,THE CAUSAL ORGANISM OF THE BACTERIAL LEAF BLIGHT OF GINGER
    Xanthomonas Zingibericola n.sp.引起的姜细菌性叶枯病
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  leaf
Berberine taken for the cytotoxic evaluatin was obtained through cell suspension cultures established from young green leaf segments.
      
Bean plants were necrotic and chlorotic, with leaf malformations, following 10-2 M treatments.
      
Results indicated that the leaf area, stem and leaf biomass, and caliper of seedlings of all four poplar clones increased with the decrease in cutting density.
      
Leaf area index reached its highest level at the spacing of 40 cm×40 cm, while the aboveground biomass of the seedling on an area basis increased as the cutting density increased.
      
SOD and POD activities declined correspondingly, followed by significant increases of MDA and MP, and leaf injury was finally observed.
      
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The injurious insects of cotton of this province, however, have not hithertobeen carefully studied, especially the pink bollworm, which annually reducesthe cotton production by 10 to 30 per cent. The present authors spent twoyears in observing the life history and habits of this insect, in attempting tofind some effective control measures. The result is herewith summarized :- 1. In the vicinity of Wu-chang, the pink bollworm has three generationsa year. The first generation occupies May and July. The second...

The injurious insects of cotton of this province, however, have not hithertobeen carefully studied, especially the pink bollworm, which annually reducesthe cotton production by 10 to 30 per cent. The present authors spent twoyears in observing the life history and habits of this insect, in attempting tofind some effective control measures. The result is herewith summarized :- 1. In the vicinity of Wu-chang, the pink bollworm has three generationsa year. The first generation occupies May and July. The second one occursin mid-July and the last in late-August. Due to the lower temperature, theemergence of the first generation need about two months. 2. In day time, the adult is usually inactive, while in windless night,after seven o'clock, it becomes very active and lays eggs mostly on green bollsand calyx. about a week later, the eggs hatch and the newly-hatched larvaeare shortly getting into the bolls. After four days they often eat into theseeds. Ten days later, the lint is so stunted as to become dusky yellow incolor, thus both the yield and the quality of cotton are greatly lowered. Themature larvae appear about half a month after. 3. Field experiments have shown that three dustings of 10% DDT- sulfurpowder were very effective. In the severely damaged cotton area, the thirdspray may be simultaneously done with controlling the cotton leaf-hoppers andthe cotton leaf-rollers. 4. About 84% hibernating larvae in cotton seeds will come out when thecotton exposed in sun light and stored in the farmer's house. Hence it seemsadvisable to put cloth or other soft material covers on the cotton stored inorder to collect and kill the larvae under them. In addition, destruction of allremaining bolls on the cotton stalks, as early as possible in winter is important. 5. For controlling the bollworms in cotton store-houses, the followingresults have been obtained 50% wettable DDT diluted with 20 parts of water,91% of larvae were killed within 30 days; 6.5% 666 (benzene hexachloride)gave a mortality of 63% in four months. Wettable 6.5% 666 diluted withwater (1:100), has been proved to be the most effective ovicide which destroys99.4% of eggs while parathion (E605) also gave a very high mortality at97.7%. But 50% wettable DDT (1:100) Kills eggs at 64.2% and lead arsena-te only 16.2% respectively. 6. There were 39.1% overwintering larvae parasitized by parasitic mitesand wasps. Among them, most are the mite, Pediculoides ventricosus Newport,while the parasitic wasps Eurypterna arakawae Mats. less than 0.5%.

红铃虫在南方棉区为害棉花相当严重,除去脱落蕾铃外,僵黄花率为10—30%,我们针对这个严重问题,进行了红铃虫生活史的观察研究与防治方法试验,写出初步结果,提供防治参考。 1.红铃虫在华中武昌棉区一年有三代。第一代羽化在5至6月,7月中旬为第二代;8月下旬为第三代;第一代的蛹和幼虫所需时期均较第二、三代长。 2.成虫白天不活动,夜晚7时以后无风天气活跃最盛,产卵以在青铃上及花萼上为最多。孵化后三十多分钟即钻入棉桃内为害,4天即侵入棉籽内取食,10天棉瓤纤维呈僵黄状,半月后幼虫即可老熟(第三代的)。 3.田间防治红铃虫以10%滴滴涕硫磺粉喷三次效果显著,在后期棉虫严重地区可结合防治叶跳虫卷叶虫等同时进行。 4.籽花内的幼虫在群众家里及晒花时逃出84%,因此指导群众将籽花堆上加覆盖物,再结合帘架晒花是消减过冬红铃虫最经济有效的办法。 4.防治仓库越冬红铃虫以50%可混性滴滴涕1:30倍水溶液杀虫效果最佳。30天内死亡率达91%.6.5%可混性666(1:20)死亡率为63%。但是1:100倍的水溶液杀卵效率高到99.4%。稀释万分之一的E605为97.7%。50%可混性滴滴涕1:100杀卵率为64.2%,砒酸铃最差...

红铃虫在南方棉区为害棉花相当严重,除去脱落蕾铃外,僵黄花率为10—30%,我们针对这个严重问题,进行了红铃虫生活史的观察研究与防治方法试验,写出初步结果,提供防治参考。 1.红铃虫在华中武昌棉区一年有三代。第一代羽化在5至6月,7月中旬为第二代;8月下旬为第三代;第一代的蛹和幼虫所需时期均较第二、三代长。 2.成虫白天不活动,夜晚7时以后无风天气活跃最盛,产卵以在青铃上及花萼上为最多。孵化后三十多分钟即钻入棉桃内为害,4天即侵入棉籽内取食,10天棉瓤纤维呈僵黄状,半月后幼虫即可老熟(第三代的)。 3.田间防治红铃虫以10%滴滴涕硫磺粉喷三次效果显著,在后期棉虫严重地区可结合防治叶跳虫卷叶虫等同时进行。 4.籽花内的幼虫在群众家里及晒花时逃出84%,因此指导群众将籽花堆上加覆盖物,再结合帘架晒花是消减过冬红铃虫最经济有效的办法。 4.防治仓库越冬红铃虫以50%可混性滴滴涕1:30倍水溶液杀虫效果最佳。30天内死亡率达91%.6.5%可混性666(1:20)死亡率为63%。但是1:100倍的水溶液杀卵效率高到99.4%。稀释万分之一的E605为97.7%。50%可混性滴滴涕1:100杀卵率为64.2%,砒酸铃最差为16.2%。 6.越冬幼虫被寄生的平均有39.1%,发现天敌有二种,其中绝大多数是榖痒螨(Pediculoides ventricosus

The present paper gives a report on the observations of the citrus psylla, Diaphorina citri Kuwayama, found in Focchow and Changchow of Fukien Province. The insect has been reported as an important citrus pest in south-eastern Asia, and is heretofore recorded from Kwangtung by Hoffmann (1936) and from Taiwan by Shiraki (1934). The citrus psylla attacks l3 species of plants of the family Rutaceae. Eggs are laid on the leaves of the young growth. The feeding of both the nymphs and adults on foliage of the new...

The present paper gives a report on the observations of the citrus psylla, Diaphorina citri Kuwayama, found in Focchow and Changchow of Fukien Province. The insect has been reported as an important citrus pest in south-eastern Asia, and is heretofore recorded from Kwangtung by Hoffmann (1936) and from Taiwan by Shiraki (1934). The citrus psylla attacks l3 species of plants of the family Rutaceae. Eggs are laid on the leaves of the young growth. The feeding of both the nymphs and adults on foliage of the new terminal growth results in the leaves, becoming thick and leathery. The leaves and the young shoots are usually distorted, dwarfed, or in severe cases, even dried. The annual life cycle of the insect in Fukien Province has not been investigated thoroughly. However, preliminary observations made during the year of 1952 show that different developmental tsages of citrus psylla could be found all the year round. There is no marked phenomenon of hibernation. Concentration of a number of adults on the same leaf usually occurs during the winter months. Both nymphs and adults become very abundant in April when dam- ages are most severe. Sixteen days are required for the insect to complete a generation in August. The number of individuals de- creases after September. The nymphs are attacked heavily by three species of chalcid parasites of the family Encyrtidae. Morphological descriptions of the different stages of the insect are also given in this paper.

柑桔木虫分布于亚洲东南的热带和亚热带地区,为害芸香科植物,是柑桔类主要害虫之一。国内除台湾、广东外,其他各地尚无报告。现知福建的福州、漳州也都有,本文系在福州观察的记述。成虫栖息取食常在芽和叶里的叶脉上。产卵于嫩芽,若虫孵化后就在新梢为害。被害叶芽枯干,枝梢萎缩,新叶畸形卷曲。生活史尚待详细研究,但根据一年来的初步观察,一年到头都可以找到各个虫期;自四月以后为害渐见严重,至九、十月则逐渐减少。夏季完成一个世代约需十六天。冬季多以成虫密集叶里,但无休眠迹象。育得跳小蜂科寄生蜂三种,九月至十一月若虫被寄生者甚多。本文对于柑桔木虫各期形态有简略的叙述。

Experiments concerning the translocation of Systox of different concent-rations for the control of cotton aphids by means of water culture, seed treat-ment, soil application and spraying were conducted both in the greenhouseand field. Data are given which show that toxicants may be taken up byseeds, roots or leaves of cotton. A very good control of cotton aphids resultedin using soil application of 0.25% Systox water emulsion (about 2 catties ofBayer's concentrate per mou) for which the moderate toxicity...

Experiments concerning the translocation of Systox of different concent-rations for the control of cotton aphids by means of water culture, seed treat-ment, soil application and spraying were conducted both in the greenhouseand field. Data are given which show that toxicants may be taken up byseeds, roots or leaves of cotton. A very good control of cotton aphids resultedin using soil application of 0.25% Systox water emulsion (about 2 catties ofBayer's concentrate per mou) for which the moderate toxicity is retained atleast for 66 days in greenhouse and 23 days in the field. It is of great signi-ficance in agricultural practice to diminish labor and increase the residualeffect of control measures against the haphazard of aphids year after yearin the cotton belt of North China.

E1059应用于棉花防治棉蚜的试验是分别在温室及田间进行的。无论浸种、水培、灌溉、喷射,它都有内导作用。此即说明棉花的种子、根或叶的组织都可吸收药液。随体液传输全体,使棉蚜产生内毒作用。从药效保持期来看,以药液灌溉最为持久。在温室内0.25%处理可保持66天;在田间(用1:400的稀释液。每亩800斤的用量)可以保持23天,如何使这个初步结果经济有效的应用於生产实践上,还需从多方面作最大的努力。

 
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