イネ紋枯病病斑高率からの被害度の算出法

概要

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The methods to estimate the severity of rice sheath blight disease caused by Rhizoctonia solani Kuhn were investigated with an aim to find a method which saves time and makes simple to test it. Rice cultivars, 1429 foreign cultivars from more than 40 countries of the world and 277 domestic cultivars, were tested for the height of the uppermost infected parts of rice plants, percentage of the height of the uppermost infected parts to the plant height and the degree of disease incidence estimated by the Yoshimura's method. All cultivars were inoculated by putting bits of the mycelia grown on wheat bran medium into the hills on July 15, 1976, and vertical development of the disease was assessed on September 1 to 6. Vertical development of the disease was always more extensive in early maturing cultivars than in late maturing ones. Statistical analysis enabled one to estimate the degree of disease incidence (Y) from percentage of the height of the uppermost infected parts to the plant height (X) by the following expression, Y=1.62X-32.4. The value X was estimated as X=0.73Z-4.13, where Z is the height of the uppermost infected parts. Estimating of the degree of disease incidence according to these formulae is more efficient and simple than one according to the Yoshimura's method.
日本植物病理学会の論文
1981-04-25