吉林省稻穗瘟药剂防治指标的初步研究

Prevention And Cure Threshold Of Chemical Control On Rice Panicle Blast In Jilin Province

文中确定了吉林省稻穗瘟病的经济损失允许水平:水稻黄熟期穗瘟发病率8～10％或穗瘟病情指数3～4。又根据吉林省有代表性的八个试验点五年的稻叶、穗瘟系统调查资料分析认为，决定吉林省生产中稻穗瘟最终病情的因素有三个:一是田间叶瘟基数;二是抽穗扬花期的气象条件;三是由当地生态栽培条件、水稻品种及稻瘟病菌生理小种群体共同决定的稻株抗病力。在此基础上提出吉林省稻穗瘟药剂防治指标。

In this paper the permissible economic injury level of rice panicle blast in Jilin province was determined as that the percentage of rice panicle blast during ripening was about 8- 10% or the disease condition index of rice panicle blast 3-4. A conclusion based upon the analysis to systematic investigation data of rice leaf and panicle blast in the 8 typical experimental locality of Jilin province over 5 years showed that three factors contributed to the final disease stataus of rice panicle blast were: 1 )the blasted leaf number in field, 2, meteorological condition during the period from earing to flowering phase and , 3) resistance to disease determined by cultivated condition, rice variety and races of Pyricularia oryzae. The prevention and cure of chemical control on rice panicle blast in Jilin were thus derived from the above mentioned research results.