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peach
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    STUDIES ON DISPERSAL OF STERILE PEACH FRUIT BORER(Carposina nipponensis Wals.) BY USING MARK-RELEASE-RECAPTURE TECHNIQUE
    采用染色标记法研究不育小食心虫(Carposina nipponensis Wals.)扩散规律
短句来源
    FIELD TRIALS OF K84 FOR CONTROL OF PEACH CROWN GALL IN CHINA
    K84防治根癌病田间试验初报
短句来源
    Experiment on Snare Fruit-Absorbin Noctuid in Peach Garden With Mixed Liquid of Honey and Dipterex
    蜜糖与敌百虫混合液诱杀园吸果夜蛾试验
短句来源
    STUDY ON THE SEASONAL PATTERN OF INSECT COMMUNITY IN PEACH ORCHARDS AROUND CHENGDU
    成都园昆虫群落季节格局研究
短句来源
    STUDY ON THE COLORIFIC BIOTYPES OF GREEN PEACH APHID
    蚜体色生物型的研究
短句来源
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  桃树
    IDENTIFICATION OF THE PEACH ROOT ROT NEMATODES IN SICHUAN PROVINCE
    四川桃树根腐线虫的鉴定
短句来源
    Fequency trembler grid lamps have strong power of catching main pest of vegetable and peach, and have remarkable effectiveness on many species pest of Lepidoptera especially. The pests included 15 species in 11 families of 4 orders in vegetable gardens and 23 species in 15 families of 2 orders in peach gardens.
    频振式杀虫灯对蔬菜、桃树主要害虫种类均具有诱杀效果,在蔬菜园区共诱害虫4目11科15种,在桃园5目15科23种,尤其对鳞翅目害虫诱杀效果显著。
    Progress of Study on Peach Diseases Caused by Viruses,Viroids and Phytoplasms
    侵染桃树的病毒、类病毒和植原体病害研究进展
短句来源
    Experiment on controlling peach bacterial shot hole with copper zinc lime liquid
    铜锌石灰液防治桃树穿孔病试验
短句来源
    Study on the Effects of Using TL Root Soaking Method for Correcting Iron Deficient Chlorosis of Fruit Trees Ⅱ Influence on the Variance of Nutrient Elements in Different Parts of Peach Leaves
    TL根系输液法防治果树缺铁黄叶病效果研究 Ⅱ对桃树不同部位叶片营养元素变化的影响
短句来源
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  桃子
    2 500 times aqueous solution of 2.5% decamethrin was applied (at most twice) or 1250 times for twice (be limited to the South of China) during fruit-bearing stage, the last 15 days before picking peach, and the results from which indicated that the highest residual amount of decamethrin on peach was less than 0.05 mg/kg.
    结果表明:在桃子结果期间,用2.5%溴氰菊酯乳油2500倍液喷施两次(最多)或1250倍液喷施两次(限南方),最后一次离采收间隔期为15天,经分析全果残留量均未超过0.05mg/kg的最高残留限量。
短句来源
    During 1986~1987, degradation and residue tests of decamethrin on peach were carried out in Zhejiang Province and Shandong Province.
    1986~1987年期间,作者在浙江临安和山东泰安分别用溴氰菊酯对桃子进行了残留动态研究。
短句来源
  “peach”译为未确定词的双语例句
    The Symptoms of Peach Black Spot (Alternaria alternata) and Identification on Pathogen
    深州蜜桃黑斑病(Alternaria alternata)的研究Ⅰ.发生情况、症状和病原鉴定
短句来源
    Study on Occurrence of Peach Black Spot (Alternaria alternata) and Disease Disposition
    深州蜜桃黑斑病(Alternaria alternata)的研究Ⅱ.侵染规律和发病诱因
短句来源
    Study on the Chemical Control of Peach Black Spot (Alternaria alternata)
    深州蜜桃黑斑病(Alternaria alternata)研究、Ⅲ──化学防治
短句来源
    Studies on the Investigation and Integrated Control of Brown Rot Disease of Peach(Monilia sp.)
    果实褐腐病的调查与防治研究
短句来源
    RAPD-PCR ANALYSIS OF POPULATION DIFFERENTIATION OF GREEN PEACH APHID IN CHINA
    我国烟蚜种群分化的RAPD分析
短句来源
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  peach
When transferred onto plum and peach, the spider mite adapted to the new hosts in the second generation; however, on cherry and apricot, it adapted in the third generation.
      
This was particularly observed under stress plant growth conditions on phytotoxic peach substrates.
      
Quantitative assessment of the infection rate of the entomophthoraceous fungus,Zoophthora anhuiensis against the green peach aph
      
A two-step method was developed to quantitatively assess the infection rate of the entomophthoraceous fungus,Zoophthora anhuiensis (Li) Humber, on the green peach aphid,Myzus persicae (Sulzer).
      
Recoveries for each pesticide added to a peach sample were obtained after applying different extraction systems.
      
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In recent years,a new disease of the foxtail millet (Setaria italica (L.) Beauv.)has been reported to occur in epiphytotic scale in most of the millet growning areasof North China.On account of the brilliant red pigmentation of the infected plant,the disease is generally referred to by the farmers as the red-leaf disease.However,the symptoms on the millet plants varied with different varieties.In general,thecharacteristic symptom exhibited on the "purple-stem" varieties was the the redden-ing of the leaf blade,leaf...

In recent years,a new disease of the foxtail millet (Setaria italica (L.) Beauv.)has been reported to occur in epiphytotic scale in most of the millet growning areasof North China.On account of the brilliant red pigmentation of the infected plant,the disease is generally referred to by the farmers as the red-leaf disease.However,the symptoms on the millet plants varied with different varieties.In general,thecharacteristic symptom exhibited on the "purple-stem" varieties was the the redden-ing of the leaf blade,leaf sheath and spike,particularly the bristle,while that onthe "green-stem" varieties was the yellowing of the leaf blade.In all instances,thediscoloration was usually accompanied by shortening of internode,stunting of thewhole plant.wrinkling of leaf surface,slight waviness of leaf margin,deformationof spike and underdevelopment of root systems.Plants infected at an early stagewere severely stunted and on heads were produced. It has been demonstrated that the red-leaf disease of the foxtail millet was causedby a virus readily transmitted by at least three different species of grain-infestingaphids:corn aphid,Rhopalostiphum maidis Fitch;grain aphid,Macrosiphum granari-um Kirby;and green-bug,Toxoptera graminum Rond.Tests with non-viruliferouscorn aphid eliminated the possibility of direct aphid injury as the cause of the disease. ??The virus was not transmissible by mechanical inoculation,by seeds nor through thesoil. Studies on the mode of transmission of red-leaf virus by corn aphid indicatedthat the virus was persistent in its insect vector and could infect in succession aseries of at least 27 tested millet seedlings.The aphid was unable to acquire thevirus in a 5-minute feedling period on the virus source but was able to pick up thevirus in 10-minute period.The 8-hour acquisition feeding period was optimum forthis aphid.The testing feeding period was found to be not more than 5 minutesand a 4-hour period of confinement on the diseased plant was ample for the aphidto cause maximum infection.Attempts to transmit the virus with cotton aphid.Aphisgossypii Gloner peach aphid,Aphis persicae Sehult and soybean aphid,Aphis glycinesMats,have given negative results.The incubation period for symptoms of the red-leaf virus in foxtail millet ranged from 10 to 32 days with the model period beingbetween 14 to 20 days. Under natural conditions,certain cultivated cereals and grass weeds showed thesymptoms resembling the red-leaf disease of foxtail millet.Among them,were ZeaMays L.,Panicum miliaceum L.,Setaria lutescens (Weigel) Hubb.,S.viridis (L.)Beauv.,Digitaria sanguinalis (L.) Scop.Echinochloa crusgalli (L.) Roem.,Eragrostiscilianensis (All.) Link,E.pilosa (L.) Beauv.,Arundinella anomala Steud,Spodiopogonsibiricus (Steud.) Trin.,Bothruochloa ischaemum (L.) Keng.,Capillipedium parviflor-um (R.Br.) Stapf and Poa practensis L..Artificial inoculation with the corn aphidproved that the first six named plant species,including the two cereals,were susce-ptible to the red-leaf virus and they produced,in all cases,the typical symptoms.Tests with the rest sexen grass weeds are in progress. The results of disease control experiments by timely spraying with an insecticide,E605,under field conditions were inconsistent.Among the 349 foxtail millet varie-ties of foxtail millet examined in the experimental field,nine of them were foundto be highly torelant to and suffered only very slightly from the attack of the red-leaf virus.These varieties were,however,succeptible in aphid transmission experiments. Available evidences point to the conclusion that the red-leaf virus of the foxtail millet herin reported is quite different from all the previously described cereal viruses.Among the cereal virus that closely resembles the red-leaf virus is the yellow-dwarfvirus reported by Oswald tnd Hauston.These two viruses are similar in the follow-ing respects:both are transmissible by the same species of aphids (Rhopalosiphummaidis,Microsiphum graminium andToxoptera granarium) and neither virus can betransferred mechanically.But they differ strikingly from each other in their hostranges.According to Oswald and Hauston,there were 19 of 55 grasses tested thatappeared to be immune from the yellow-dwarf virus.Digitaria sanguinalis,Echino-chloa crus-galli Setaria viridis and Zea Mays were among the immune hosts.On thecontary,all these four gramineous plants were found to be extremely susceptible tothe red-leaf virus both under natural condition and in artificial inoculation experi-ments.Accordingly,the red-leaf,a persistent aphid borne virus affecting the foxtailmillet,is herein reported as a new virus of the cereals.

小米红叶病是在我国华北分布普遍和为害严重的一种小米病害。病害的症状,在紫杆的小米品种上面,主要的是叶片、叶鞘和穗变紅;在青杆品种上面是叶片黄化。無論如何,紫杆和青杆品种病株除变色外,都可随伴各种畸形,包括植株矮化、叶面绉折、叶綠波状、穗变形和根系發育不良。紅叶病是一个借蚜虫傳播的病毒病害衩籽痢⒙蟪す苎梁吐蠖硌辆軅鞑ゲ『?其中以玉米蚜为最重要。曾經测定玉米蚜在病株上面吸食获得病毒和在健株上面吸食所需最短的时間;带毒玉米蚜的数目和傳病效能的关系谐嵫梁腿舫婢軅鞑 S锰已痢⒋蠖寡梁兔扪羵鞑∥椿竦谜慕Y果。紫杆品种感病后,仅表皮細胞、叶毛細胞和泡状細胞变成紅化,其下层的組織不紅化。叶綠素逐漸消失,但消失过程相当的慢。在病害最末期,維管束內的靱皮細胞少数的坏死,导水管內可能充塞有棕色胶質物,其它細胞無显著的变化。檢查病叶未發現有細胞內含体。用带毒蚜虫作人工接种,証知小米紅叶病病毒能侵染玉米和黍。这两种作物在自然环境下均發生紅叶病。在自然环境下,有以下的禾谷类杂草紅化:金狗尾、青狗尾、馬唐、大画眉草、画眉草、稗、野牯草、大油芒、白羊草、細柄草和六月禾。用玉米蚜作人工接种証明稗、青狗尾、金狗尾、馬唐、六月禾和大油...

小米红叶病是在我国华北分布普遍和为害严重的一种小米病害。病害的症状,在紫杆的小米品种上面,主要的是叶片、叶鞘和穗变紅;在青杆品种上面是叶片黄化。無論如何,紫杆和青杆品种病株除变色外,都可随伴各种畸形,包括植株矮化、叶面绉折、叶綠波状、穗变形和根系發育不良。紅叶病是一个借蚜虫傳播的病毒病害衩籽痢⒙蟪す苎梁吐蠖硌辆軅鞑ゲ『?其中以玉米蚜为最重要。曾經测定玉米蚜在病株上面吸食获得病毒和在健株上面吸食所需最短的时間;带毒玉米蚜的数目和傳病效能的关系谐嵫梁腿舫婢軅鞑 S锰已痢⒋蠖寡梁兔扪羵鞑∥椿竦谜慕Y果。紫杆品种感病后,仅表皮細胞、叶毛細胞和泡状細胞变成紅化,其下层的組織不紅化。叶綠素逐漸消失,但消失过程相当的慢。在病害最末期,維管束內的靱皮細胞少数的坏死,导水管內可能充塞有棕色胶質物,其它細胞無显著的变化。檢查病叶未發現有細胞內含体。用带毒蚜虫作人工接种,証知小米紅叶病病毒能侵染玉米和黍。这两种作物在自然环境下均發生紅叶病。在自然环境下,有以下的禾谷类杂草紅化:金狗尾、青狗尾、馬唐、大画眉草、画眉草、稗、野牯草、大油芒、白羊草、細柄草和六月禾。用玉米蚜作人工接种証明稗、青狗尾、金狗尾、馬唐、六月禾和大油芒均感染小米紅叶病病毒。其它紅化杂草和接种試驗,正在进行中。紅叶病病毒对小米植株所产生的影响,因植株發育的阶段不同而輕重有所差异,植株感病愈早病害愈剧烈。用杀虫剂E605在田間噴射小米防治紅叶病,未能表現药剂有防病的效能,在田間观察349个品种,选得9个高度耐病和农艺性状优良的品种。抗病选种可能是当前防治小米紅叶病最有效的防治措施。根据病原的傳染方法,寄主范围和所表現的症状,小米紅叶病病毒和以往所报道的禾本科植物的病毒病害的病毒均不相同,因此它是禾谷类作物的一个新的病毒。

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。

The sugar beet yellows (Corium betae, Holmes) has broken out in Sarcin, Inner Mongolia since the introduction of this industrial crop in that area not long before. In ordinary years 10—20 percent of the diseased root beet plants has been recorded, while in a severely epiphytotic year such as 1956, the percentages of diseased plants are raised to 50 and 90. The peach aphid (Myzus persicae Sulz) is dominant in the beet fields in the vicinity of Sarcin and is regarded as the main insect vector of sugar beet...

The sugar beet yellows (Corium betae, Holmes) has broken out in Sarcin, Inner Mongolia since the introduction of this industrial crop in that area not long before. In ordinary years 10—20 percent of the diseased root beet plants has been recorded, while in a severely epiphytotic year such as 1956, the percentages of diseased plants are raised to 50 and 90. The peach aphid (Myzus persicae Sulz) is dominant in the beet fields in the vicinity of Sarcin and is regarded as the main insect vector of sugar beet yellows. An inoculation experiment carried out at Sarcin Station on 30th August by means of virulified peach aphids reveals that an incubation period of about 30 days is needed before the expression of symptoms. In the fields the symptoms of sugar beet yellows appear in the middle of June or in the early part of July. The development of the disease reaches a peak in the middle of August or in the early part of September. The density of infection varies with year and with the total area of seed beet cultivation. An analysis of the sugar content of the roots of the variety Aj3 in the later part of September, 1953 shows that the diseased roots yield 13.2 percent less sucrose than the healthy. In 1954 an analysis made with the roots of the variety PZHR_1 shows the loss of 27.7 to 31.4 percent of sugar. An average loss of 25 percent of root weight of the diseased PZHR_1 plants is recorded in 1956. The diseased seed beet plants are demonstrated to be the source of primary infection. A survey made in a root beet field neighbouring to a seed beet plot revcals that the more close to the seed beet plot, the more dense the infection. In the seed beet plot, 55 percent of the plants are diseased, while at a distance of 9 meters from that plot, 52.8 percent of beet plants diseased, at a distance of 102 meters, 10.2 percent and at a distance of 200 meters, only 1 to 2 percent. The seed beet fields are mainly centered at Sarcin, whereas the root crops are scattered in some distances from that locality. A survey made in the severely epiphytotic year 1956 in the vicinity of Sarcin leads us to believe that Sarcin is the focus of infection. At a distance of 3.5 to 4 kilometers from Sarcin, 5 to 10 percent of diseased plants are recorded and at a distance of 6 to 7 kilometers, 0 to 2 percent of the beet plants are diseased, while in Sarcin, the diseased seed beet plants range from 30 to 50 percent. It is to be pointed out that at one district, 7.5 kilometers from Sarcin, 3 to 6 percent of root beet plants are infected. It might be due to the fact that there is a small seed plot existing within this area. It is therefore inferred that the safe distance from the seed beet district for the cultivation of root beet should not be, less than 10 kilometers, and in addition, no single small seed plot is allowed to be kept within this circumference. In Sarcin the mass migration of peach aphids happens in the middle of July and also in the middle of September. It is considered that the first mass migration of the winged aphids might be responsible for the outbreak of the disease in the middle of the August. However, the infection made by the aphids in the middle of September might not be expressed in the current season. Some observations made to 54 varieties of sugar beet introduced from various part of the world reveal that there is no single variety immune to yellows, however, a significant varietal difference is noted among them. Four varieties, dj3, PZHR_4, Rogow C, and a hybrid of Sarcin Station No. 19 show 2.8 to 7.6 percent of infection, while other varieties such as Beta 242/C, Beta Y 19, Y_3, C×M.L.R.×P, M_2 and P 632 show 26.6 to 37.1 percent of infection. The susceptible variety M_2 is widely cultivated in inner Mongolia in 1956 and is considered to be one of the factors responsible for the epiphytotic in that year.

甜菜黃化毒病(Corium betae Holmes)在內蒙甜菜栽培区流行,其中以沙而沁甜菜試驗場附近最严重。1956年部分地区的受病达50—90%,而一般年份为10—20%。在内蒙桃蚜(Myzus persicae Sulz.)是主要的传毒媒介。用这种蚜虫在8月30日接种,到9月5日已全部发病,潛育期为30天左右。在內蒙地区病害的症状在6月中旬至7月上旬开始在田間出現,到8月中下旬至9月上旬达到最高峯。根据測定,1953年Aj_1品种在9月下旬病株的含糖量降低13.2%。1954年PZHR_1品种的含糖量降低27.7%至31.4%。1956年測定PZHR_1病株根重降低25%。甜菜黄化毒病的传布主要是从带病的采种株上蔓延出来。根据一块靠近种株的甜菜地的調查,距离采种田9米以內的发病为52.8%,102米处为10.2%,以后愈远愈少。从大面积来看,1956年沙而沁采种区內当时的发病率为30—50%;3.5—4公里处为5—10%,6—7公里处为0—2%。如果距离之內有小块的采种田,那么在7.5公里处尚有发病株3—6%。发病的百分率随采种区面种的扩大而有增加的趋势。桃蚜的活动与发病的关系密切。1956年在沙而沁地...

甜菜黃化毒病(Corium betae Holmes)在內蒙甜菜栽培区流行,其中以沙而沁甜菜試驗場附近最严重。1956年部分地区的受病达50—90%,而一般年份为10—20%。在内蒙桃蚜(Myzus persicae Sulz.)是主要的传毒媒介。用这种蚜虫在8月30日接种,到9月5日已全部发病,潛育期为30天左右。在內蒙地区病害的症状在6月中旬至7月上旬开始在田間出現,到8月中下旬至9月上旬达到最高峯。根据測定,1953年Aj_1品种在9月下旬病株的含糖量降低13.2%。1954年PZHR_1品种的含糖量降低27.7%至31.4%。1956年測定PZHR_1病株根重降低25%。甜菜黄化毒病的传布主要是从带病的采种株上蔓延出来。根据一块靠近种株的甜菜地的調查,距离采种田9米以內的发病为52.8%,102米处为10.2%,以后愈远愈少。从大面积来看,1956年沙而沁采种区內当时的发病率为30—50%;3.5—4公里处为5—10%,6—7公里处为0—2%。如果距离之內有小块的采种田,那么在7.5公里处尚有发病株3—6%。发病的百分率随采种区面种的扩大而有增加的趋势。桃蚜的活动与发病的关系密切。1956年在沙而沁地区对于有翅桃蚜的观察,見到从6月下旬起到10月上旬之間,有翅桃蚜的发生有两个高峯:一个在7月中旬,另一个在9月中旬。按照黄化毒病的潛育期来推算,7月中旬有翅蚜的大发生,与8月中旬田间病情达到最高峯,显然有密切的关系。預期9月中旬的侵染不能使甜菜当年表現症状,但是給采种母根增加了感病百分率而在第二年的采种田內表現出来。品种間对黄化毒病的反应显然有差别。从54个品种的初步調查来看,发病率在10%以下的有4个品种:Aj_3,PZHR_4,Rogow C和杂种19号。1956年在內蒙大量栽培的M品种是一个非常感病的品种。发病率在33.3%左右。整个观察中发病率在10—25%之间的有44个品种;发病率在26—37.1%之間的有6个品种。认为抗病品种的选育是值得重视的。由調查研究得出結論:原料甜菜的栽培应与采种甜菜隔离至少10公里以上才能安全,同时,在这10公里的范围內不能?嫒魏蔚男∑芍种辍?

 
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