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首页> 外文学位 >EPIDEMIOLOGICAL ASPECTS OF SORGHUM DOWNY MILDEW, CAUSED BY PERONOSCLEROSPORA SORGHI (PLANT PROTECTION, DISEASES, PESTS).
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EPIDEMIOLOGICAL ASPECTS OF SORGHUM DOWNY MILDEW, CAUSED BY PERONOSCLEROSPORA SORGHI (PLANT PROTECTION, DISEASES, PESTS).

机译：梨小球藻造成的高粱霜霉病的流行病学方面（植物保护，疾病，害虫）。

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摘要

The distribution and spatial pattern of sorghum plants systemically infected with Peronosclerospora sorghi were determined using Morisita's index of dispersion. A contiguous area of 1300 m('2) was assessed for disease incidence twice during the growing season at two locations. Each assessment was done using eight quadrat sizes (binary series from 1 m('2) to 128 m('2)). The spatial pattern of diseased plants was clumped at each date and location as determined by the use of Morisita's index. Several clump sizes, which were in a hierarchical order, were detected at each location. Comparison of clump sizes between assessment dates showed a reduction in average clump size, which was attributed to premature plant death.;The incidence of sorghum downy mildew was influenced by the soil moisture-soil temperature and soil texture-inoculum density complex with statistical significance using logistic regression. The interaction was nonsignificant. A soil temperature-soil moisture combination of 25C and -2/10 bar and soil texture of 80% sand content gave the optimal conditions for disease incidence. Planting dates which are followed by saturated soils and/or soil temperatures below 20 C, or soils with a sand content below 20%, can be classified as disease suppressive.;The influence of weather variates on disease incidence of sorghum downy mildew at three locations and over four years was investigated using Principal Component Analysis. Two principal components, derived from the weather data only and representing wet, dry, and cold soil conditions, were used as independent variables in regression analysis and explained 41% of the variation in disease incidence.;The spatial pattern of sorghum systemically infected with downy mildew and of soil-residing oospores of Peronosclerospora sorghi was assessed using Morisita's index. A binary series of quadrat sizes, starting at 1 m('2) and ending at 128 m('2) for infected plants and 512 m('2) for the oospores, respectively, formed the basis for the computation. The pattern was clumped (p = 0.01) at all quadrat sizes except the 32-m('2) and 64-m('2) quadrat sizes for the oospore distribution pattern. The use of susceptible plants to assess spatial patterns of oospores of P. sorghi instead of direct sampling of soil cores is indicated.
机译：利用森里斯塔的分散指数确定了被高粱杆孢菌感染的高粱植物的分布和空间格局。在生长季节的两个位置，对连续的1300 m（'2）区域的疾病发病率进行了两次评估。每次评估均使用八种四边形尺寸（从1 m（'2）到128 m（'2）的二进制序列）进行。病态植株的空间格局在每个日期和地点都采用森森指数来确定。在每个位置检测到了几个块的大小，这些大小按层次结构排列。评估日期之间的团块大小比较表明，平均团块大小减少，这归因于植物过早死亡;高粱霜霉病的发生率受到土壤水分-土壤温度和土壤质地-菌落密度复合物的影响，具有统计学意义逻辑回归。交互作用不明显。 25°C和-2/10 bar的土壤温度-土壤水分组合以及砂含量为80％的土壤质地为疾病发病提供了最佳条件。播种日期随后是饱和土壤和/或土壤温度低于20 C或沙含量低于20％的土壤，可以归类为抑制病害;天气变化对三个地方高粱霜霉病发病率的影响并使用主成分分析法调查了四年多的时间。仅从天气数据得出的两个主要成分代表了潮湿，干燥和寒冷的土壤状况，它们被用作回归分析中的自变量，并解释了41％的疾病发生率变化。系统性感染霜霉病的高粱的空间格局使用森里斯塔氏指数评估了高粱Peronosclerospora sorghi的霉菌和土壤中的孢子。分别由受感染植物的1 m（'2）和128 m（'2）以及卵形孢子的512 m（'2）组成的二进制序列的二进制序列构成了计算的基础。除了卵子分布图案的32-m（'2）和64-m（'2）方形尺寸以外，所有方形尺寸上的图形都呈团块状（p = 0.01）。指出了使用易感植物评估高粱假单胞菌卵子的空间格局，而不是直接对土壤核心进行采样。

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  • 作者

    SCHUH, WOLFGANG.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Agriculture Plant Pathology.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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