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downy mildew     
相关语句
  霜霉病
     Downy Mildew of cucumber[Pseudoperonospor cubensis(Berk.et Curt.)
     黄瓜霜霉病[Pseudoperonospor cubensis(Berk.et Curt.)
短句来源
     (2)Disease resistance:values of disease index under artificial conditions for anthracnose,TuMV,downy mildew and alternaria leaf spot were 5.98(HR),17.20(R),16.06(R)and 13.96(R).
     (2)抗病:对炭疽病、TuMV、霜霉病和黑斑病进行人工接种鉴定,病情指数分别为5.98(HR)、17.20(R)、16.06(R)和13.96(R)。
短句来源
     1. (2) Disease resistance: values of disease index under artificial conditions for TuMV, downy mildew and alternaria leaf spot were 4.01 (HR), 12.09 (R), 12.96 (R) and 1.54 (HR), 9.17 (HR), 23.42 (R).
     (2)抗病:两品种TuMV、霜霉病、黑斑病人工鉴定病情指数分别为4.01(HR),12.09(R),12.96(R)和1.54(HR),9.17(HR),23.42(R);
短句来源
     The downy mildew [Plasmopara halstedii (Farl.)
     向日葵霜霉病菌Plasmopara halstedii(Farl.)
短句来源
     band with 0.2661, 0.2978 and 0.4455 Rf is of grapes with resistance or mid resistance to downy mildew.
     Rf为0.2661、0.2978和0.4455的酶带,为抗或中抗霜霉病品种的相关谱带。
短句来源
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  霜霉
     The results of field trial showed that the mixture of junduqing and prompamocarb 20%AS had good effect for controlling cucumber downy mildew. The effect was 74.04%~79.64% at the dose of 130~160g/667m2 after 7 days,and reached to 82.28%~87.16% after 14 days. which were equal to that of the same dose of prompamocarb 35%AS.
     保护地田间试验结果表明,20%菌毒·霜霉水剂在130、160mL/667m2剂量下,药后7d防效分别为74.04%、79.64%,药后14d防效为82.28%~87.16%,在相同的用量下效果与霜霉威单用相当,且持效期较长,对黄瓜安全,是防治黄瓜霜霉病的较好药剂。
短句来源
     Evaluation for alfalfa germplasm resistance to downy mildew under alpine grassland conditions
     高山草原条件下苜蓿种质抗霜霉性评价
短句来源
     The downy mildew, bacterial soft rot and virus diseases are three kinds of serious disease on chinese cabbage ( Brassica pekinensis ) .
     病毒、霜霉和细菌性软腐是中国大白菜(Brassica pekinensis)的3种重要病害。
短句来源
     Enestroburin provided good activity in field experiments against Chinese cabbage downy mildew. Efficacy was significantly better than that provided by propamocarb 72.2% AS, metalaxyl 25% WP, and chlorothalonil 70% WP, and was equivalent to that given by azoxystrobin 25% SC and dimethomorph plus mancozeb 69% WP.
     田间试验结果表明:对白菜霜霉病具有很好防治效果显著优于对照药剂72.2%霜霉威水剂、70%百菌清可湿性粉剂和25%甲霜灵可湿性粉剂,与25%嘧菌酯悬浮剂及69%安克·锰锌可湿性粉剂相当。
短句来源
     The formation and germination rates of sporangia of Peronospora parasitica, pathogen of downy mildew on Chinese cabbage plants, are closely related to temperature and light.
     大白菜霜霉病的病原——寄生霜霉(Peronospora parasitica pers.Fr.) 孢子囊产生、萌发的速度与温、光密切相关。
短句来源
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  霜霉病菌
     The downy mildew [Plasmopara halstedii (Farl.)
     向日葵霜霉病菌Plasmopara halstedii(Farl.)
短句来源
     Downy mildew is caused by Pseudoperonospora cubensis (Berk.& Curt.) Rostov, and is a major foliar disease of cucumber in the world.
     黄瓜霜霉病是由古巴假霜霉病菌[Pseudoperonospora cubensis(Berk.& Curt.)Rostov]引起的,是世界范围内黄瓜主要叶部病害之一。
短句来源
     These two plant extracts had an inhibiting action on the germination of zoospores of downy mildew of melon and their inhibiting efficiencies were respectively 48.2% and 25.3%.
     上述2种植物提取液对甜瓜霜霉病菌游动孢子萌发的抑制率分别为48.2%和25.3%。
短句来源
     Spores germinition test shows that the inhibiting rate is 93.5% at 50mg/l. The protectant and curative effects against cucumber downy mildew are 100% and 92.3% respectively at 100mg/l.
     50mg/l浓度下对黄瓜霜霉病菌孢子萌发抑制率为93.5%,100mg/l浓度下对黄瓜霜霉病保护效果为100%,治疗效果为92.3%。
短句来源
     In the early Chinese reports, the pathogen of maize downy mildew which occurred in Guangxi and Yunnan was named Peronosclerospora maydis (Ra-cib.)
     在我国文献中广西云南玉米霜霉病菌名称为Peronosclerospora maydis(Racib.)
短句来源
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  霜霉病抗性
     Study on Mechanisms and Molecular Makers of Resistance to Downy Mildew in Non-Heading Chinese Cabbage
     不结球白菜霜霉病抗性机制及其分子标记
短句来源
     The contents of amino acid, sugar and chlorophyll in different cucumber varieties with different resistance to downy mildew of cucumber were tested.
     对黄瓜霜霉病抗性不同的黄瓜品种氨基酸含量进行测定,结果表明,在萌动种子内,除谷氨酸、赖氨酸和NH_3外,其它氨基酸的平均含量抗病品种高于感病品种;
短句来源
     Advances in molecular mechanisms of the resistance of Arabidopsis thaliana to downy mildew
     拟南芥霜霉病抗性分子机制研究进展
短句来源
     Resistance Identification and Resistant Varieties Screening of Downy Mildew of Radish
     萝卜霜霉病抗性鉴定及抗性品种筛选
短句来源
     Induction of resistance to downy mildew by oxalic acid or BTH in cucumber seedlings and the accumulation of pathogenesis-related proteins in intercellular fluids
     草酸和BTH对黄瓜幼苗霜霉病抗性和胞间隙病程相关蛋白的诱导
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      downy mildew
    Previously undetected race-specific resistance to Bremia lactucae (downy mildew) was located in many lettuce cultivars hitherto considered to be universally susceptible to this disease.
          
    For diseases such as cereal rusts, rice blast, and powdery mildew and downy mildew of cucumber, the sporulation curves for the pathogens have been shown to follow an approximately triangular pattern.
          
    Repeatability of stability estimators for downy mildew incidence in pearl millet
          
    Repeatability of mean downy mildew (Sclerospora graminicola (Sacc.) Schroet.) incidence, regression coefficients and deviation mean squares were investigated for 25 pearl millet (Pennisetum typhoides (Burm.) Stapf.
          
    Correlation coefficients between arrays of mean downy mildew incidence from different pairs of subsets ranged from 0.57 to 0.98 and those of deviation mean squares from 0.58 to 0.96 indicating good repeatability of these parameters.
          
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    Field trials of controlling both downy and powdery mildews of cucumber plants were carried out at the experimental station of the university and at a field plot in a people's commune in Peking. A number of fungicides was employed in these trials in order to compare the effectiveness of copper stearate and Bordeaux mixture with that of Dithane (made in China) against these maladies. The results pointed out that Bordeaux mixture (1:1.5:200—300) and copper stearate (1:4—6:800) were both effective against the two...

    Field trials of controlling both downy and powdery mildews of cucumber plants were carried out at the experimental station of the university and at a field plot in a people's commune in Peking. A number of fungicides was employed in these trials in order to compare the effectiveness of copper stearate and Bordeaux mixture with that of Dithane (made in China) against these maladies. The results pointed out that Bordeaux mixture (1:1.5:200—300) and copper stearate (1:4—6:800) were both effective against the two mildews, however, the latter inhibited the powdery mildew better than the former. A mixture of 1% copper sulphate solution and 5% washing soap solution at a rate of 1:1 mixed without boiling was very effective for controlling the both and gave a higher yield. This mixture was easier in preparation than the copper stearate employed in routine spray. Dithane (1:800) was effective only for controlling the downy mildew, but non-effective for the powdery mildew. The addition of 0.2% colloid sulphur into the Dithane preparation rendered it cffective for controlling the powdery mildew also. Dithane (1:500) caused a little injury to the Peking varieties of cucumber, but 1:800 in concentration was safe. Addition of 0.5% resin solution into Bordeaux mixture increased the effectiveness of the later during the rainy season. According to the record of the disease indices made at various stages during the growth period, it was noted that the effect of the chemical protection became significant only when the disease indices in the non-sprayed plots raised to about 50. Below this level, the increase of yield of the sprayed plots in comparing with those of non-sprayed plots was usually insignificant. The Dithane (1:800) sprayed plots had a yield 27% higher than the non-sprayed controls. In the plots where 2 earlier sprays with copper stearate and 4 later sprays with Bordeaux mixture were made resulted a yield 38% higher than the non-sprayed plots. The net profit increased per Mou by employing 6 sprays of Dithane (1:800) was 22.3 Yuen, while that by 2 sprays of copper stearate and 4 sprays of Bordeaux mixture was 77.3 Yuen. The difference was considered to be due to the loss caused by the damage inflicted by the powdery mildew in the Dithane plots.

    在焉連洼及肖家河两个试验中分别比较了热制铜皂液、波尔多液及代森锌对防治黄瓜霜霉病及白粉病所起的作用。试验中肯定了铜皂液(1∶4∶800,1∶6∶800)对霜霉病及白粉病都有一定的抑制作用,波尔多液(1∶1.5∶200—300)对霜霉病的抑制作用稍强于铜皂液,但对白粉病的抑制稍弱于铜皂液。苗期用铜皂液,后期用波尔多液可以获得很好的防治效果。在一个观察区中发现,冷制铜皂液有替代热制铜皂液的希望,因其药效及增产作用都不亚于后者。在多雨的情况下波尔多液中加入1∶200的甲松皂可以增加其药效。代森锌(1∶500,1∶800)对霜霉病有显著的保护作用,但是对白粉病不超任何防治效果。1∶500的浓度对黄瓜的生长有轻微的药害。1∶800全无药害。在1∶800的代森锌液中加入0.16分(=0.2%)的细硫粉时可以兼治霜霉及白粉病,而且获得此铜剂更高的产量,由于这一试区重复少,可以提出来作进一步的试验。代森锌中混入魚藤精作为兼治蚜虫之用时,似乎有一些微小的不良作用,但没有显著的药害。在肖家河点上的生产试验中证明,前期喷2次铜皂液,后期喷4次波尔多液的比无处理区的总产量超出38%,使用1∶800代森辞6次的比无处理区的总产量超出2...

    在焉連洼及肖家河两个试验中分别比较了热制铜皂液、波尔多液及代森锌对防治黄瓜霜霉病及白粉病所起的作用。试验中肯定了铜皂液(1∶4∶800,1∶6∶800)对霜霉病及白粉病都有一定的抑制作用,波尔多液(1∶1.5∶200—300)对霜霉病的抑制作用稍强于铜皂液,但对白粉病的抑制稍弱于铜皂液。苗期用铜皂液,后期用波尔多液可以获得很好的防治效果。在一个观察区中发现,冷制铜皂液有替代热制铜皂液的希望,因其药效及增产作用都不亚于后者。在多雨的情况下波尔多液中加入1∶200的甲松皂可以增加其药效。代森锌(1∶500,1∶800)对霜霉病有显著的保护作用,但是对白粉病不超任何防治效果。1∶500的浓度对黄瓜的生长有轻微的药害。1∶800全无药害。在1∶800的代森锌液中加入0.16分(=0.2%)的细硫粉时可以兼治霜霉及白粉病,而且获得此铜剂更高的产量,由于这一试区重复少,可以提出来作进一步的试验。代森锌中混入魚藤精作为兼治蚜虫之用时,似乎有一些微小的不良作用,但没有显著的药害。在肖家河点上的生产试验中证明,前期喷2次铜皂液,后期喷4次波尔多液的比无处理区的总产量超出38%,使用1∶800代森辞6次的比无处理区的总产量超出27%。代森锌区的增产较铜一波区较小的原因在于白粉病较重。根据成本计算,铜皂液一波尔多液处理区因防治而增收的利益为每亩77.3元,而代森锌区刖为22.3元。由此可见,在黄瓜栽培采用上述两种药剂前后喷布6次结果还是有利的。从分期采收及病情指数来看,当无处理区的病情指数在50以下时,药剂的作用还不明显,病情指数在50—90时,药剂的作用便极为明显,指数升到90以上时,此时无处理区已经枯死,而药剂防治区依然可以收瓜。估计代森锌区可以延长收瓜10天,而铜一波区可以延长16天。

    The autumnal incidence of the downy mildew of Chinese cabbage in North China occa-sionally caused a serious damage.Overwintered as well as oversummered oospores were con-sidered to be the most important primary source of infection of this disease in Peking,Tien-tsin and other localities of North China.A large amount of oospores was found in the dis-eased leaf-tissues collected from both spring and autumn Chinese cabbage crops.Seedling in-fection by soil-borne oospores from the previous crop had been demonstrated.However,seed-ling...

    The autumnal incidence of the downy mildew of Chinese cabbage in North China occa-sionally caused a serious damage.Overwintered as well as oversummered oospores were con-sidered to be the most important primary source of infection of this disease in Peking,Tien-tsin and other localities of North China.A large amount of oospores was found in the dis-eased leaf-tissues collected from both spring and autumn Chinese cabbage crops.Seedling in-fection by soil-borne oospores from the previous crop had been demonstrated.However,seed-ling infection by seed-borne oospores or mycelium was precarious.Some seed samples of theChinese cabbage variety“Chiaochowpai”obtained from Shantung province were contaminatedwith oospores.Apparently such seeds were produced from heavily attacked seedplants.Never-theless,oospores had never been detected in seed samples of various varieties collected fromPeking and Tientsin during 1961-1962.Mycelium was detected to hibernate in seed coats ofsome samples collected from the infected capsules of late grown seed-plants.The phenomenon of the limited systemic infection of the downy mildew of Chinese cabbageseedlings was reported for the first time.This pathogen was revealed to penetrate thehypocotyl,spread upward,pass the cotyledons and finally enter the first pair of true leaves,but never the second pair.The writers were of the opinion that the limited systemic infec-tion of the seedlings constitutes the initial stage of epiphytotics of this disease.

    在北京和天津等地调查研究了大白菜霜霉病的初侵染来源问题,并对幼苗的有限系统侵染现象进行了研究。卵孢子是初侵染的重要来源,华北和东北各主要白菜产区的白菜病叶和菜田土壤中存在有大量霜霉病菌的卵孢子。这些卵孢子可以侵染幼苗而引起发病,在田间形成初发病株成为再侵染的来源。田间卵孢子一年不止形成一次,春菜上形成的卵孢子到秋季即可侵染。种子带菌情况因地区而异。山东“胶州白”因种株上易罹病害,莢果组织中的卵孢子可以夹在种子间传播。1961—1962年在京津两地收集的种子上未检查到卵孢子。唯在部分春播采种的种子上,病菌菌丝可潛伏于种皮中并产生孢子囊。以菌丝在留种株上潛伏而在次年带到田间成为春菜初侵染来源的可能性仍需进一步研究。首次报导了大白菜幼苗上 Peronospora parasitica 的有限系统侵染可以达到第一对真叶。病菌从茎基部侵入后,菌丝向上扩展进入子叶和第一对真叶,但不进入第二对真叶。田间最早发生的病株大多是有限系统侵染的。这一发现对了解病害流行起点是有帮助的。

    The downy mildew of lettuce is a widely distributed disease in Chengtu. It is found on lettuce all the year around, but the severest infection occurs during the early spring. The viability of sporangia is lost in 7-10 days. In the diseased, tissues of leaf, stem and seed, no oospore has been found. Field observations and experimental results indicate, that hibernating organ of the pathogene might be mycelia in the infected seed and the infected tissue in soil, both of which were considered to be the primary...

    The downy mildew of lettuce is a widely distributed disease in Chengtu. It is found on lettuce all the year around, but the severest infection occurs during the early spring. The viability of sporangia is lost in 7-10 days. In the diseased, tissues of leaf, stem and seed, no oospore has been found. Field observations and experimental results indicate, that hibernating organ of the pathogene might be mycelia in the infected seed and the infected tissue in soil, both of which were considered to be the primary sources of infection. In Chengtu there is no severe winter and summer, the climatic condition are favorable for the growth of Bremia lactucae on lettuce in the fields, and the lettuce is cultivated all the whole year round. Field observations indicate that the pathogene is so able to infect the plant in all seasons. Over-wintering or over-summering in vitro is therefore unnecessary. Six species and a variety of Compositae were artificially inoculated, the results show that, Lactuca chinensis, Crepis japonica, Taraxacum mongolicum, Sonchus oleraceua, Sassurea offinis and. Lactuca sativa (foliage lettuce) are immune, the Lactuca sativa L. var. angustana is susceptible and it appeares that there are varietal differences in susceptibility.

    成都萵笋霜霉病菌孢子囊寿命很短,生活力只能維持7—10天。在病叶、茎及种子中,均未发現卵孢子。其初侵染来源可能是种子或病組織中潛藏的菌絲。調查結果表明,萵笋霜霉病菌可以藉气流或水流終年侵染,不在活体外休眠。 萵笋霜霉病菌寄主范围小,在6种菊科植物上接种未获成功,表現出明显的专化現象,品种間抗病性亦有显著的差異。

     
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