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1982年在美国路州大学水稻试验站进行本试验。流行学研究结果表明,品种抗病性、接种体数量是影响纹枯病发展的重要因素。Mars、Melrose 等品种具有中等抗病性,Lebonnet、Belmont 和 Labelle 等品种最感病,Saturn、Le-ah 和 Brazos 则属中等感病。从品种抗病性和接种量的相互作用关系中看出,品种抗病性在决定病害严重度上作用更大。病害系统观察发现,水稻不同生育期的感病率与成熟期病害严重度呈高度正相关。据此建立了不同抗病水平品种的病害严重度预测模式。纹枯病对不同抗病水平品种的为害损失测定结果表明,感病品种损失率为29%,中等感病种为22%,中等抗痫种为9%。试验发现,水稻拔节期及孕穗期的稻秆感病率与产量损失有中度至高度正相关。据此,亦建立了产量损失预测模式。结论认为防治水稻纹枯病的根本途径是选育和推广抗病高产品种;中抗以上的品种能满足生产防治需要,不必施行其他防治措施。
1982 in the United States Luzhou Rice Experimental Station for the test. Epidemiological studies have shown that disease resistance of varieties, inoculum size is an important factor affecting the development of sheath blight. Mars, Melrose and other varieties have moderate disease resistance, Lebonnet, Belmont and Labelle and other varieties of the most susceptible, Saturn, Le-ah and Brazos are moderately susceptible. From the relationship between disease resistance and inoculum size, it can be seen that the disease resistance of the cultivars plays a greater role in determining the severity of the disease. Disease system observation found that the rice in different growth stages of the disease prevalence and maturity of disease severity was highly positive correlation. Based on this, the prediction model of disease severity of different resistant varieties was established. Rhizoctonia solani showed that the loss rate of susceptible varieties was 29%, that of moderate susceptible species was 22%, and that of moderate anti-epileptic species was 9%. The results showed that there was a moderate to high positive correlation between rice straw susceptibility and yield loss at the jointing and booting stages. Accordingly, a yield loss prediction model has also been established. The conclusion is that the fundamental way to prevent and control rice sheath blight is to breed and popularize disease-resistant and high-yielding varieties. The varieties above Zhong-resistant can meet the needs of production control without implementing other control measures.