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通过对仙居县 2 3年 ( 1978～ 2 0 0 0年 )稻瘟病发生的调查资料分析表明 ,早稻稻瘟病大流行年份的气候特点 ,主要表现为在寄主生长的前期 ,即育秧期和分蘖期 ,气候温暖多雨 ,病菌活动时间提早 ;而在寄主生长的中后期 ,即早稻拔节孕穗至抽穗灌浆期又出现低温、多雨和寡日照的天气。在温度、雨量、雨日和光照这 4个影响稻瘟病发生的气象因素中 ,经计算机通径分析结果可知 ,以雨日对早稻稻瘟病流行程度的直接作用最大 ,其次是光照和雨量 ,温度的影响最小
Based on the survey data of the occurrence of rice blast in Xianju County for 23 years (1978 ~ 2000), the climatic characteristics of the rice blast in the early rice season were mainly observed in the early stage of host growth, that is, the seedling stage and tillering Period, the climate warm and rainy, bacteria activity time earlier; and in the late growth of the host, that is, early rice jointing booting stage to heading stage grouting appeared low temperature, rainy and oligo-day weather. Among the four meteorological factors affecting the occurrence of rice blast, such as temperature, rainfall, rain and light, the results of computerized path analysis showed that the direct effect of rain on rice blast prevalence was the highest, followed by light and rainfall, temperature The least impact