重庆涪陵稻区水稻叶鞘腐败病的发生与防控技术研究

Factors Affecting Rice Leaf Sheath Rot and Control of the Disease in Fuling Region of Chongqing,China

水稻叶鞘腐败病是一种严重威胁水稻生产的真菌病害.2004—2007年在重庆涪陵稻区的调查结果表明:水稻分蘖晚、分蘖期雨水过多、种植密度大、氮肥过多均有利于水稻叶鞘腐败病的发生,水稻的品种、栽培制度和田间长势对该病的发生有很大影响.经田间试验测定,西农优7号、宜香9303、Q优6号和川香稻5号对叶鞘腐败病表现高度抗病性;25%施保克乳油和20%井冈霉素可湿性粉剂对水稻叶鞘腐败病的防治效果达到80%以上.同时还确定了药剂使用浓度和最佳试药时期,为有效地控制水稻叶鞘腐败病提供了依据.

Rice leaf sheath rot is an important disease of rice caused by Sarocladium oryzae（Sawada） W.Gams.et Webster.Our observations and experiments indicated that delayed tillering,excessive rainfall at tillering stage,high transplanting density and over nitrogen application enhanced in the disease severity of rice leaf sheath rot.The variety of rice,cultivating system and plant growth prosperity also had great influence on the disease development.At the same time,the study screened several resistant varieties,control pesticides and its optimal concentration and control time,according to control techniques of rice leaf sheath rotten disease.