稻曲病大发生关键因子及药剂防治研究

针对稻曲病在水稻生产上危害日趋加重的现状，2002-2005年对引起该病大发生的关键因子及药剂防治技术进行了连续4年的研究。结果表明：感病品种（组合）和水稻孕穗至抽穗期间5d以上降水天气是引起稻曲病大发生的二个关键因子‘同时，稻曲病为害程度还与水稻栽培方式、种植密度、肥水管理及施药水平等因素有关。稻曲病药剂防治技术关键：一是选用有效药剂。二是抓住施药适期施药。筛选出防治稻曲病的有效药剂有30％爱苗EC，43％好力克SC和62．25N仙生WP。稻曲病施药适期是水稻分蘖末期、破口前3～7d、始穗期3个时期。

Study on the Occurring Key Factors of Rice False Smut and Its Pesticide Prevention

Aimed at the actuality of more and more yield loss damaged by rice false smut,the occurring key factors of the disease and the techniques of pesticide prevention were studied in successive four years in 2002~2005.The results indicated that the main factors were the sensitive variety and above 5 rainy days from booting to heading of rice.Moreover,yield loss of rice was affected by cultivation method,planting density,fertilizer and water management and dosage of pesticide.There were two key points of pesticide prevention to rice false smut,the first was choice of pesticide,and the second was the period of pesticide spraying.Three effective pesticides to prevent rice false smut were screened out: 30% Armure EC,43% Horizon SC and 62.5% Mancozeb WP.Late tillering,3~7 d before tasselling and initial heading stages were the appropriate time to pesticide spraying.