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perennial
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  多年生
    Toxicity of 15 insecticides to Perennial ryegrass seed root
    15种杀虫剂对多年生黑麦草幼苗根生长的毒性效应
短句来源
    Comparing of 30 Pesticides Sensitivity to Perennial Ryegrass and Strong Creeping Red Fescue
    30种农药对多年生黑麦草和紫羊茅敏感性比较研究
短句来源
    Five isolates (PA1, PA2, PA3, PA4, PA5) were isolated from Perennial ryegrass, of them PA1 and PA5 were identified to be Pythium aphanidermatum.
    本试验从多年生黑麦草上分离得到了5株腐霉菌(编号依次为PA1、PA2、PA3、PA4、PA5),通过鉴定,PA1和PA5菌株为瓜果腐霉菌(Pythium aphanidermatum)。
短句来源
    1 36 weed species were found in weed investigation, included 17 annual weeds, 2 biannual weeds and 17 perennial weeds.
    1 对试验地点的主要杂草的进行调查,有杂草36种,其中一年生17种,越年生2种,多年生17种。
短句来源
    (2) perennial latifolious weed stage;
    (2)多年生阔叶杂草占优势的草坪杂草阶段;
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  多年生的
    Applying one gram effective amount per mu can control and strongly inhibit more than twenty annual and perennial dicot weeds,with weed control effect up to 90~100% and weed green weight decrease up to over 95%.
    每亩用有效量1克即可防除和强烈抑制麦田二十多种一年生和多年生的双子叶杂草,杀草效果可达90~100%,杂草鲜重减退率达95%以上。
短句来源
    The results indicate that the mixed use experiment on taking giyphosate and paraquat as principal agents and taking atrazine and oust as adjuvants can eradicate the perennial weeds mainly consisting of Dicranopteris linearis which damage the growth of bamboos and the experimental effects reach over 92%. Applying these drugs in spring and summer can make bamboos safe and can also make bamboo forests possess successive benign vegetation.
    通过多种高效林用除草剂的单用、混用的除草灭灌试验 ,结果表明 :以草甘膦、克芜踪、草甘膦 +使它隆为主剂 ,以莠去津、Oust为辅剂的混用试验 ,能把危害竹子生长的多年生的芒萁骨为主的杂草灭除 ,其效果达 92 %以上 ,在春夏施药 ,竹子安全 ,并使竹林向良性植被演替
短句来源
  宿根
    Zizania latifolia Turcz, which originates from China and Southeast Asia, belongs to perennial aquatic vegetables and reproduces asexually.
    茭白(Zizania latifolia Turcz)为多年生水生宿根性草本植物,无性繁殖,原产中国和东南亚。
短句来源
    Fragaria ananassa Duchesne belongs to Fragaria of Rosaceae. It is perennial herbaceous plant.
    草莓(Fragaria ananassa Duchesne)属蔷薇科(Rosaceae)草莓属(Fragaria)宿根性多年生常绿草本植物,是一种美食、保健及药用兼用的栽培植物。
短句来源
    There is a close relationship between the damage of perennial root and its growing state and soil organic material contents.
    ⑤地上部分长势、土壤有机质与宿根受害关系密切,长势愈好,受害愈轻;
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  “perennial”译为未确定词的双语例句
    After 7 days’ test, the greatest root length and shoot length of perennial ryegrass were 4.95cm and 5.89cm;
    生长7d后黑麦草根长最大值4.95cm,茎长最大值5.89cm;
短句来源
    Eupatorium odoratum Linn, is a perennial grass or subshrub of the genus of Eupatorium(Compositae) , which has become a forestry harmful plant in China.
    飞机草(Eupatorium odoratum Linn.)
短句来源
    The fungus is perennial,having 3.6μm wide hyphae and cylindric haustoria with round or blunt ends, 3.6μm in width and 14μm in length.
    吸器单细胞,单核,顶端钝圆棒状,径3.6μm,长14.4μm。
短句来源
    The rates of apple perennial canker and apple anthacnos among the rotted fruits were 82.99%~91.08% and 6.87%~9.48% respectively at the harvest stage.
    采收期病果中轮纹病占 82 .99%~ 91 .0 8% ,炭疽病占 6.87%~ 9.4 8%。
短句来源
    The rate of apple perennial canker was 78.50%~80.56% among all rotted fruits during the storage period.
    贮藏期病果轮纹病占 78.50 %~ 80 .56%。
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  perennial
Psathyrostachys huashanica Keng is a perennial grass and belongs to genus Psathyrostachys under Triticeae.
      
The successes of breeding Jiafuzhan is a solution to the existing perennial problems in the rice industry, such as poor grain quality of big-grain rice and early indica rice, low productivity, and poor blast resistance of elite rice.
      
Solidago canadensis, a perennial Compositae plant originating from North America, was introduced into China as a horticultural plant in 1935.
      
The ontogeny of perennial polycarpic herb Panax ginseng C.A.
      
The sedimentation stages approximately coincide with replacement of the shallow-water marine environment by the fluvioalluvial environment marked by steady and intense perennial river drainage from a highland in the northeast.
      
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Chinese rape, varieties of Brassica campestris and B. chinensis and many cruciferous crops including radishes, but except varieties of B. oleracea, are generally affected by a mosaic disease, causing serious losses amounting occasionally to a death rate of over 90%, while an infection rate of over 30% is not uncommon. The symptoms involved were vein-clearing, yellow or green veinbanding, typical mosaic, rugosity of leaf lamina, dwarfing and rosetting. They may appear in different combinations. Flower stalks...

Chinese rape, varieties of Brassica campestris and B. chinensis and many cruciferous crops including radishes, but except varieties of B. oleracea, are generally affected by a mosaic disease, causing serious losses amounting occasionally to a death rate of over 90%, while an infection rate of over 30% is not uncommon. The symptoms involved were vein-clearing, yellow or green veinbanding, typical mosaic, rugosity of leaf lamina, dwarfing and rosetting. They may appear in different combinations. Flower stalks may not come out or are shortened, deformed and twisted. Flowers appeared pale yellow and become abortive, or forming only small and twisted seed pod, which are sometimes spotted with black necrosis, and bearing small and deformed seeds. When the winter temperature is low, diseased plants may succumb first, forming missing hills. Late infections may result only in vein-banding of the upper leaves and partial abortion of the seeds. On several varieties of radish, mostly of the green type, which apparently are more resistant, only fine mottling appears on the leaves while infected. On varieties of B. napella, another oil-bearing group, the symptoms are entirely different (plate 1, fig. 5), appearing as systemic bright yellow spots on the leaves. Necrotic flecking can eventually be found at the center of these spots. Necrotic streaks and spots develop on the flower stalks and seed pods. Dwarfing and distortion occur on leaves, stalks and pods, and death may even be resulted from severe infections. However, this species showed certain degree of resistance to the disease in the form of late infection and the lower incidence of the disease. The viruses from different host plants are cross-inoculable, although some strains do not infect B. napella. None of them can infect the cabbage group by sap inoculation. 3 viruses were identified: differentiated by their physical properties and the host reactions they induced (Tables 1 and 2 for the viruses 1 and 2): 1. Thermal inactivation below 70℃. 2. Producing necrotic local lesions only on N. tabacum var, "Nungling 400" …… virus 1 2. Producing necrotic local lesions and systemic mottling on the same host……virus 2 1. Thermal inactivation above 90℃., necrotic local lesions on N. glutinosa…… virus 3 The first two viruses can be subdivided into 2 strains each by their ability to infect B. napella. Virus 1 is considered to be a strain of Brassica virus 2 or the Turnip mosaic virus; from the type, it differs in not infecting the cabbage group. Virus 2 is identified as a strain of Cucumis virus 1 or the Cucumber mosaic; virus; from the type, it differs in having lower thermal inactivation point (55℃.), lower dilution end point (1: 1,000—3,000); and shorter longevity invitro (2 days), in producing local lesions on tobacco, and in that the typical strain of Cacumis virus 1 gives only a partial protection to this strain on tobacco. The 3rd virus was less studied. It shows affinity to Nicotiana virus 1 or the tobacco mosaic virus. A limited test showed that the first virus was the only virus found present in the field in 1957. An analysis of 17 isolates of virus from the Chinese rape, exhibiting various syndromes of symptoms in the field, gave an Unanimous result in host reactions, indicating that these isolates belong to a single virus. Virus 1 was found to be easily transmitted by sap, by aphids, including peach aphid (Myzus pcrsicae), false cabbage aphid (Rhopalosiphum pseudobrassicae), and cotton aphid (Aphis gossypii). In insect relationship, the virus belongs to the nonpersistent group, a single feeding will enable an active transmission of about 20 minutes. Peach aphid seems to be an effective vector that 2 or more viruliferous aphids per plant are capable of 100% transmission. The virus is not seed-transmitted. Fresh residue of diseased plant in the soil may cause occasional infection of the replanted plants. The virus can infect several cruciferous weeds, but, among them, only Rorippa montana (wall.) Small grows all the year round and possesses a perennial crown. It is also foundto be commonly infected in the nature. Rubbing with infected sap or using aphid as vector, the virus from this weed can easily be transmitted to the Chinese rape, producing the typical mosaic symptoms. This weed, therefore, seems to be capable of beoming a source of inoculum for the primary infection of the Chinese rape.

南京及华东地区的油菜与十字花科蔬菜普遍发生花叶病。病原病毒經抗性(失毒温度、稀释終点、体外保毒期)測定和寄主反应測定,认为可以分作三大类型:分别为芸苔病毒2号,黄瓜病毒1号与烟病毒1号的株系。前两种病毒都能为害油菜、大白菜、白菜、芥菜、蘿卜等,但不为害甘蓝型的蔬菜,并都能引起菠菜和茼蒿的花叶,和在烟上引起局部枯斑。第一型在烟农特400号和心叶烟上不引起花叶,而第二型在烟和心叶烟上都能引起系統性花叶。第一型不为害心叶烟,而第三型可在心叶烟上引起小枯斑。第一型与凌立、楊演的油菜花叶病毒相近似,而和范怀忠、柯冲从十字花科蔬菜中所分离出的分离物1号最为相象。与裘維蕃、王祁楷在白菜上所发現的孤丁病毒的差别,在于不能侵害甘蓝类的蔬菜。第二型病毒与范怀忠、柯冲的分离物3号相近似,但与典型的黃瓜花叶病毒仍具有一定的差异。这些病毒在油菜上所引起的症状却沒有明显的差別。1、2两个类型的病毒都有一部分能为害早生朝鮮型的油菜,引起系統性黄斑及枮斑,病重的也能早期死亡。大田中的油菜病株的病毒,大多属于第一型病毒。病毒主要由桃蚜和蘿卜蚜传染,病毒系非持續性的,蚜虫一次吸毒后,传病期不超过20分钟。两个以上的桃蚜传病率就可达100%。种子...

南京及华东地区的油菜与十字花科蔬菜普遍发生花叶病。病原病毒經抗性(失毒温度、稀释終点、体外保毒期)測定和寄主反应測定,认为可以分作三大类型:分别为芸苔病毒2号,黄瓜病毒1号与烟病毒1号的株系。前两种病毒都能为害油菜、大白菜、白菜、芥菜、蘿卜等,但不为害甘蓝型的蔬菜,并都能引起菠菜和茼蒿的花叶,和在烟上引起局部枯斑。第一型在烟农特400号和心叶烟上不引起花叶,而第二型在烟和心叶烟上都能引起系統性花叶。第一型不为害心叶烟,而第三型可在心叶烟上引起小枯斑。第一型与凌立、楊演的油菜花叶病毒相近似,而和范怀忠、柯冲从十字花科蔬菜中所分离出的分离物1号最为相象。与裘維蕃、王祁楷在白菜上所发現的孤丁病毒的差别,在于不能侵害甘蓝类的蔬菜。第二型病毒与范怀忠、柯冲的分离物3号相近似,但与典型的黃瓜花叶病毒仍具有一定的差异。这些病毒在油菜上所引起的症状却沒有明显的差別。1、2两个类型的病毒都有一部分能为害早生朝鮮型的油菜,引起系統性黄斑及枮斑,病重的也能早期死亡。大田中的油菜病株的病毒,大多属于第一型病毒。病毒主要由桃蚜和蘿卜蚜传染,病毒系非持續性的,蚜虫一次吸毒后,传病期不超过20分钟。两个以上的桃蚜传病率就可达100%。种子不传病。殘留在土壤內的新鮮病根,可以传病。蔊菜在自然情况下可以感染病害。病株上病毒可由蚜虫传至油菜而誘发典型的花叶病,且具有終年生长及終年发病的特性,可能成为初期发病的病毒来源。

Asarum heterotropoides F. Schmidt var. mand shuricum (Maxim.) Kitag., an important perennial medicinal crop, is cultivated locally in Liaoning Province. Loss of plants caused by blighting in the range of 20 to 80% has been reported recently in cultivated gardens. The causal pathogen, Sclerotinia asari Wu and C. R. Wang has been identified. The pathogen attacks both the underground and aerial parts of the plant. It can cause rots on root, bud, seedling, petiole leaf and fruit. Diseased plants blighted completely...

Asarum heterotropoides F. Schmidt var. mand shuricum (Maxim.) Kitag., an important perennial medicinal crop, is cultivated locally in Liaoning Province. Loss of plants caused by blighting in the range of 20 to 80% has been reported recently in cultivated gardens. The causal pathogen, Sclerotinia asari Wu and C. R. Wang has been identified. The pathogen attacks both the underground and aerial parts of the plant. It can cause rots on root, bud, seedling, petiole leaf and fruit. Diseased plants blighted completely and then perished. S. asari has both asexual and apothecial stages. In nature sclerotial blight is carried by mycelia in seeds, seedlings and soil. Apothecia are produced from germinating selerotia. Very few apothecia are produced in nature. Infection of plants by ascospores is negligible. S. asari can grow between 0℃ and 27℃ but not at 28℃. The pathogen grows well in potato dextrose agar between 7℃ and 15℃. It perishes after 24 hours at 32℃. The pathogen weakens its virulence after several transfers in PDA but the virluence could be recoverd by growing the culture subsequently in carrot cubes. The pathogen has only a narrow host range; infection is most on A. heterotropoides var. mandshuricum.

细辛菌核疫病是随着细辛人工扩大栽培而出现的一个新问题。此病在辽宁省的新宾、凤城、宽甸、桓仁、本溪、丹东市郊区和吉林省等局部地区均有发生。病害发生在植株的地下和地上各个部分,诱致根腐、芽腐、苗腐、叶腐、柄腐和果腐等症状,最后使全株腐烂死亡。病害由细辛核盘菌,Sclerotinia asari 侵害所致。病菌具有无性与有性两个世代。在田间自然情况下,无性世代的菌丝体是主要的侵染源,多次试验重复,由菌核萌发产生子囊盘的机率较低,子囊孢子致病力很弱。细辛核盘菌生长温度范围为0~27℃,至28℃以上基本上不能生长,32℃经24小时即死亡。适温条件为7~15℃。病菌在PDA上可以生长,但致病力似有减弱现象,用胡萝卜切块培养具有复壮作用。病菌寄主范围较窄,目前仅知对细聿具有高度致病作用。

Suirpts planieulmis Fr.Schmidt is a perennial and malignant weed in the paddy-rice fields.It has very strong hardiness,wide adaptability and a great damage.They can produce a great number of seeds by the gene-rative propagation,with the aid of winds,waters and paddy seeds its seeds spread quickly.By way of vegetative propagation they produce the stem tubers which spread out and injure the crops.The seedlings pro-duced by the seeds mainly occur in June.The emergence of the aftergrass produced by stem tubers...

Suirpts planieulmis Fr.Schmidt is a perennial and malignant weed in the paddy-rice fields.It has very strong hardiness,wide adaptability and a great damage.They can produce a great number of seeds by the gene-rative propagation,with the aid of winds,waters and paddy seeds its seeds spread quickly.By way of vegetative propagation they produce the stem tubers which spread out and injure the crops.The seedlings pro-duced by the seeds mainly occur in June.The emergence of the aftergrass produced by stem tubers from the soil is quite dispersive.S.Planiculmis has the phenomenon of the apical dominonce.It is susceptible to tempe-rature and sunshine.Accompanied with season changing its growth rhy-thm becomes quite clear and distinct.Nitrofen,chlornitrofen(125g/mu effective dose)and Cyperon(200g/mu effective dose)are used for soil treatment,they can kill the buds and young plants of S.planiculmis.By use of Bendazone(100-150g/mu effective dose),2.4-D or MCPA mixed in certain proportions with the Propanil(40+10~30g/mu effective dose),spray applications to the shoots of S.planiculmis can kill the weeds in different growth stages.

扁秆藨草是水稻田的一种多年生恶性杂草,抗逆力强、适应性广、危害极大。它既能有性繁殖产生大量种子随风、流水、稻种扩散传播,又能无性繁殖产生块茎扩大蔓延危害。由种子产生的实生苗主要发生在6月份,由块茎产生的再生苗出土分散。扁秆蔗草有顶端优势现象,对溫度、光照相当敏感,随着季节的变化,生活节律相当明显。除草醚、草枯醚(125克/亩,有效量下同)、莎朴隆(200克/亩)作土壤处理可消灭草芽。苯达松(100~150克/亩)、2.4—D或2甲4氯与敌稗复配(40克+10~30克/亩)作茎叶喷雾,可杀死不同生育阶段的扁秆蔗草。

 
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