影响水稻纹枯病流行、危害的因子分析

Factorial analysis of prevalence and damage of rice sheath blight

以连作早稻为研究对象，对影响水稻纹枯病发生、危害有关的因子，即品种、施氮肥量、气象因素、为害损失、发病时间、病情程度及药剂等作了系统的定量研究．结果表明，品种间存在抗病性和危害损失程度上的差异；施氮肥量与发病程度关系密切；气象因素中以日均温和雨日频率与病害流行速率关系密切；发病时间与为害损失率相关性不明显，药剂防治效果与控病时间、病情基数有关．

The development and damage of rice sheath blight are affected by such factors as rice strain,amount of applied fertiizer N, meteorological factors, damage loss, incidence time, seriousnessdegree of the disease and chemicals, which were studied quantitativcly with continuouslycropped early rice as test crop. The results indicated that different rice strains showed differentlevels of resistance and damage loss. The seriousness degree of the disease was closely correlatedwith the amount of applied fertilizer N, and the prevalent speed was clasely related to the average daily temperature and rainy day frequency. The relationship between incidence time anddamage loss was no significant, and the effect of chemicals was correlated with control timeand disease index.