摘要
水稻对稻曲病的抗性不同品种间差异明显,孕穗期是易感病期,病害发生程度的轻重,除水稻品种抗病性外,在很大程度上受水稻孕穗期至齐穗期的气候条件的影响,在此期间,如果雨日多、雨量多、日照时数少、相对湿度高、昼夜温差小,发病率就高,反之,则低,防治试验结果表明,多菌铜对稻曲病的防效优于井岗霉素等常用杀菌剂,采用6％多菌铜可湿性粉剂兑水50倍于水稻孕穗初斯至中期防治一次,即可获得良好的防病效果,一般防效在90％以上,本文还讨论了高感和中感品病害发生率预测预报应用的可能性。
Experiments of rice green smut[Ustilaginoidea virens(cooke)Tak.]were conducted in Hunan province during 1982～1987.The results showed that different rice varieties and weather conditions in the period from booting to lateheading stage had different resistance to the disease.Big amount and highfrequency of rain,high relative humidity short sunshine during the day,and little difference in temperature between the day and the night were the main factors inducing the occurenee of rice green smut.Duojuntong showed superior control effect over that of Jingangmycin and other tested fungisides.Spraying 6％ Duojuntong at early or middle booting stage was effective and economical
关键词
稻曲病
发生规律
抗病性
化学防治
Gree smut of rice
pests occurrence rule
prediction
Disease resistance
Chemical prevention
