论文部分内容阅读
水稻黄叶病的发生流行,在年际间有明显的间歇性。研究表明,此病在闽西北晚季水稻上流行的主导因素是冬春的温度,关键因素是6月下旬至7月下旬的介体昆虫数量;重要影响因素是晚稻的品种和插秧期,并据此提出了可于发病前90—100天对当地水稻黄叶病进行预测的经验式。水稻矮缩病在年际间的流行间歇,没有黄叶病明显。一般晚稻的流行程度,与早稻孕穗期的植株发病率和6月中下旬的田间黑尾叶蝉带毒率均有显著相关。据此,在数理统计的基础上,提出了可于发病前40—50天进行预测的方程式。所求结果只要结合晚稻品种抗病性类型和插秧期迟早及介体的虫量与关键传毒期加以分析,便能相当确切地估测晚稻矮缩病的发生趋势。
The occurrence of yellow leaf disease in rice is obviously intermittent during the year. Studies have shown that the dominant factor of the disease epidemic in late-season paddy in northwestern Fujian is the temperature in winter and spring, the key factor is the number of mediator insects in late June to late July; the important influencing factors are the variety and transplanting of late rice and Based on this, we put forward an empirical formula that can predict the yellow leaf disease in the local area 90-100 days before onset. Rice dwarf disease in the intersex interval, no obvious yellow leaf disease. The prevalence of late rice in general was significantly correlated with the incidence of plants at early brisk booting stage and that of late-stage leafhoppers in southern and late June. Accordingly, on the basis of mathematical statistics, we put forward the equation that can be predicted 40-50 days before onset. As long as the result of the study is combined with the type of disease resistance of late rice, the early and late planting season of rice, the quantity of the insect and the critical period of poisoning, the trend of occurrence of late rice shortening can be estimated accurately.