环境因素对薏苡黑粉病菌冬孢子活力的影响

Effect of Enviroment on the Teleutospore Viability of Ustilago coicis

薏苡黑粉菌的冬孢子在室内干燥条件下，可以存活５年左右，北京地区田间地表及地下５ｃｍ深处的冬孢子均可以安全越冬，增加土壤湿度有利于降低土壤中越冬孢子数量。病田轮作大豆、山药等作物安全期至少为２年。

The teleutospores of Ustilago coicis can retain their germinating power under indoor dry conditions for about five years.They can survive the winter in the fields in Beijing.Increase of soil humidity could reduce the number of teleutospores in soil.Rotation is an efficient method to control the head smut of Jobstears and the rotation cycle is two years minimum.