发病中心      disease focus(0) focus of infection(0) infection center(0) a center of wheat stripe rust(0) 目前没有对本词条修改信息

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为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。   disease focus Attempts to develop better medications for Alzheimer's disease focus on symptomatic treatments for both cognitive and behavioral symptoms. 例句来源       Avian and mammalian hosts for spirochete-infected ticks and insects in a Lyme disease focus in Connecticut. 例句来源       A second physician scientist is sought whose disease focus is in breast, GU or gynecologic cancers. 例句来源       Anterior fusion by bone transplantation after a thorough excision of the disease focus is successful in a very high proportion of cases. 例句来源       Another important lesson learned from SCOR is that the disease focus is critical to unifying the goals of basic and clinical researchers. 例句来源       更多

The black spot of Sanqi,has been found very destructive in almost             “三七黑斑病”在云南省文山州各县,广西省靖西等县三七产区,普遍发生,一般发病率为20～35%,严重达90%以上,是造成三七产量和种子大幅度减产的主要原因。经鉴定该病系Alternaria panax Whetz侵染所致,是我国三七生产上的一种新病害。本病原菌能在病残体中越冬,成为第二年主要初次侵染源。孢子发芽适温为18～24℃,在温度18℃和相对湿度80%接种,潜育期为5～7天,在温度20℃和相对湿度90%以上,潜育期相应缩短。该病于3月三七出苗发生。高温多湿雨季蔓延快,为害重。采取综合防治:加强田间管理,及时清除发病中心病株,喷退菌特、代森铵、代森锌、百菌清、炭疽福镁等农药,有显著防效。 文摘来源          In regard to the control of soybean downy mildew, the present study showed that the occurrence of systemically-infected seedlings produced from oospore-encrusted seeds could be absolutely eliminated by treating seeds with 35% Apron at the rate of 35g a. i. per 100 kg seeds. Seed treatment with another fungicide, Aliette, at the rate of 240g a. i./100 kg seeds also gave an effective result where the systemically-infected seedlings reduced by more than 97%.The result of the experiment carried out in large pro...             试验证明,采用35％甲霜安按种子重量0.1％拌种,可以完全免除由霜霉病粒引起的大豆霜霉病系统感染病苗的形成。防除效果达100％。采用80％抑霉灵按种子重量0.3％拌种,效果也在97％以上。 在大面积生产田的初步试验表明,采取抑霉灵拌种措施,由于基本消灭了由系统感染病苗所形成的初次发病中心,可以显著减轻整个生育期间大豆霜霉病的蔓延为害,最终发病严重率比不处理区降低73％,病粒率降低90％。认为这一措施应在不同生产条件下进一步试验验证。 文摘来源          Basic model describing the circular spread from the infection focusof wheat yellow rust was developed based on the disease gradient modelXi=a·exp(-bd~n).The whole field under study was divided into square com-partments with side length being one unit of distance“d”,facilatingthe determination of the distance between each compartment and the fo-cus center.Parameter“b”can be predicted from a regression equation of“b”upon the wind velocity“w”,and parameter“a”was deducted based on therelationship between a and ...             在国内已发表的两个小麦条锈病流行电算模拟模型的基础上,将研究的病害传播范围等分成一定大小的正方形小区,并以其为空间传播的计量单元,确定各小区的方位和间距。利用Mackenzie 的病害直线传播梯度模型,通过试验建立回归预测式求得b 值。并根据子代病叶总数与子代发病中心病情的定量关系,求出中心点病情a。再经过随机数转换和重叠侵染转换,与已有的日传染率、潜育期模型相结合,组建了“XRZD-1”电子计算机模拟模型。通过多次循环可以推算和打印出逐日的各小区病害数量及形象化图形。实现了病害时间动态和空间动态的协同模拟。 文摘来源   << 更多相关文摘

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