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  chenopodium
This review summarizes the long-term research of photoperiodic flower induction in two Chenopodium species, one of which, C.
      
Flowering of Cultivated Green and SAN 9789-Treated Chenopodium rubrum Plants Exposed to White, Blue, and Red Light
      
Temporal dynamics of soil nematode community structure under invasive Ambrosia trifida and native Chenopodium serotinum
      
Temporal dynamics of soil nematode community structure at the depth of 0 - 30 cm was compared under invasive Ambrosia trifida and native Chenopodium serotinum in an abandoned cropland in Northeast China.
      
Gynomonoecy in Chenopodium quinoa (Chenopodiaceae): variation in inflorescence and floral types in some accessions
      
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The mosaic disease of the Chinese cabbage (Brassica pekinensis Rupr.) has broken out in the vicinity of Urumchi. North Sinkiang, since 1955. In ordinary years it reduced more than 30 percent of the yield, while in an epiphytotic year such as 1961, the death rates of infected plants raised to 90-100% in the northern part of Sinkiang, and in other districts an average loss of 50 percent of the crop was not uncommon. The cabbage aphid [Brevicoryne brassicae (L.)], peach aphid [Myzus persicae (Sulz.)] and cotton...

The mosaic disease of the Chinese cabbage (Brassica pekinensis Rupr.) has broken out in the vicinity of Urumchi. North Sinkiang, since 1955. In ordinary years it reduced more than 30 percent of the yield, while in an epiphytotic year such as 1961, the death rates of infected plants raised to 90-100% in the northern part of Sinkiang, and in other districts an average loss of 50 percent of the crop was not uncommon. The cabbage aphid [Brevicoryne brassicae (L.)], peach aphid [Myzus persicae (Sulz.)] and cotton aphid [Aphis gossypii (Glover)] are capable of transmitting the virus. The cabbage aphid is dominant in the cruciferous vegetable fields during the growing season and is regarded as the main insect vector of which the winged and wingless aphids have the same capability of transmission. One viruliferous cabbage aphid for each 2-leaved Chinese cabbage seedling results 80 percent of infection. One non-virulified aphid with a 1-minute-feeding on diseased plant is sufficient to acquire 35 percent of infection. On the other hand, one virulified aphid feeding on a 2-leaved healthy seedling for 1 minute results only 10 percent of infection. This virus belongs to the non-persistent group since 1 non-virulified aphid with a single feeding maintains its transmissibility only about 25 minutes. According to the field surveys made in 1960 to 1962 from June to October in Urumchi, the prevalence and severence of the disease depended, in a large extent, on the dispersion and population of the winged form of the principal aphid vector during the early seedling stage of the Chinese cabbage. In the past 3 years, the peak of flight of the winged form occurred about in the last part of July, and symptoms of the infected plants usually appeared in the middle part of August. It was therefore concluded that a great mass migration of the winged aphids is responsible for the epiphytotics of the disease. Field observation in the past years pointed out that the virus oversummered mainly in the cruciferous vegetables, including Gan-lan (Brassica olercea var. capitata L.) and Pie-lan (Brassica oleracea var. gongylodes L.). The naturally infected cruciferous and chenopodious weeds including Thlaspi arvense L., Cardaria pubesens Jarm., C. repens Jarm., Sisymbrium altissmum L., Chenopodium ficifolium Smith, and Chenopodium albaum L. seemed not to play as the oversummering hosts of the virus.

甘藍蚜、桃蚜和棉蚜的有翅型与无翅型,均能传播大白菜病毒病,其中以甘藍蚜为最主要的传毒介体。一头带毒蚜可使80%的健苗发病;一头无毒蚜經吸毒一分钟的传病率为35%;健苗經一头有毒蚜传毒一分钟,就有10%发病。病毒系非持久性的,蚜虫一次吸毒后的传毒期限为25分钟左右。在烏魯木齐地区,有翅甘藍蚜全年中的迁飞高峯期,都是在7月下旬。証实了这时期与大白菜病毒病的流行,有极密切的关系。当年春、夏季播种的甘蓝和苤藍,尤其是晚甘蓝和晚苤蓝,是大白菜(包括冬蘿卜)苗期的初次毒源和蚜源。初步認为,能感染病毒的几种十字花科及藜科杂草,不是本病病毒和甘藍蚜的重要越夏寄主。

During 1972-1979,we had made some investigations and studies onthe biological and ecological characteristics of the main field weeds inShanghai.After surveying the natural occurance of 189 kinds of mainfield weeds,the following four occuring types are suggested early springtype,spring-summer type,autumn-winter type and spring-autumntype,with Chenopodium album L.,Digitaria sanguinalis(L.)Scop.andEchinochloa crus-galli(L.)Beauv.,Alopecurus aequalis Sobol.,as wellas Chenopodium serotinum L.as their...

During 1972-1979,we had made some investigations and studies onthe biological and ecological characteristics of the main field weeds inShanghai.After surveying the natural occurance of 189 kinds of mainfield weeds,the following four occuring types are suggested early springtype,spring-summer type,autumn-winter type and spring-autumntype,with Chenopodium album L.,Digitaria sanguinalis(L.)Scop.andEchinochloa crus-galli(L.)Beauv.,Alopecurus aequalis Sobol.,as wellas Chenopodium serotinum L.as their representatives respectively.At thesame time,we had made it clear that in different years,under diffe-rent crops and cuttivation conditions,as a result of variation in envi-ronmental conditions,there remains some differences in the occurancesof weeds,Grasping the law of the weeds occurance and the characteris-tics of their growth and development,we are able to provide certaintheoritical evidences for the control of weeds and for the rational andtimely application of herbicides.

1972—79年调查研究了上海农田杂草的发生和消长。在野外调查189种农田主要杂草自然发生情况,提出了四个发生型:以藜等为代表的早春发生型;以马唐、稗草等为代表的春、夏发生型;以看麦娘等为代表的秋、冬发生型;以小藜等为代表的春、秋发生型。同时,明确了在不同年份,不同茬口、不同耕作情况下,因环境条件的变化,杂草发生也有差异。掌握它们的发生规律和生长发育特点,为防除杂草及合理、适时应用除草剂提供了一定的理论依据。

The barley stripe mosaic virus occurred and was isolated from wheat cv, chta-hemon in Wuji-aqu, Xinjiang.The isolate showed T.D.P.at 60-65℃ longevity in vitro 9-14 days and D.E.P. 1:3000. The virus was transmitted with mechanical inoculation, The host range was limited to theplant of gramineae. No symoptoms were shown on inoculated plants of Spinacia oleracea, Nicotianaglutinosa, N.tabacum, Sansum, Chenopodium amaranitcolor and Beta ulgaris. The virus was purified by PEG and PEG-differential centrifugation...

The barley stripe mosaic virus occurred and was isolated from wheat cv, chta-hemon in Wuji-aqu, Xinjiang.The isolate showed T.D.P.at 60-65℃ longevity in vitro 9-14 days and D.E.P. 1:3000. The virus was transmitted with mechanical inoculation, The host range was limited to theplant of gramineae. No symoptoms were shown on inoculated plants of Spinacia oleracea, Nicotianaglutinosa, N.tabacum, Sansum, Chenopodium amaranitcolor and Beta ulgaris. The virus was purified by PEG and PEG-differential centrifugation and the partially purifiedvirus was used as antigen for preparing antiserum.The antiserum produced reaches titres of 28: 1and 1:1024.The Percentage of seed transmission varied with wheat varieties and cultivars. Results of tests on the pollen transmission were negative.

在新疆五家渠奇台黑芒小麦上分离到大麦条纹花叶病毒,致死温度60~65℃;体外存活期9~14天;稀释限点1:3000倍。人工接种可侵染禾本科植物,对接过种的非禾本科植物如灰藜、苋色藜、菠菜、甜菜、普通烟、心叶烟、枯斑三生烟、萹豆等不表现病状。用聚乙二醇沉淀和聚乙二醇沉淀、差速离心提取病毒,注入家兔体内,可形成相应的抗体,效价为1:128,1:1024,病毒颗粒为短棒状115~129×20毫微米。初步观察,病株上的麦种带毒率与种子的饱满程度、品种、感病阶段有一定的相关性。病株上的花粉与健株母本杂交的种子不带毒。

 
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