云南大理州玉米灰斑病发生、危害现状及防治研究

Occurrence,damage and control of maize gray spot in Dali Prefecture,Yunnan

于2006~2007年对云南省大理州玉米上新发生的病害——玉米灰斑病菌(Cercospora zeae-maydis)进行调查.结果表明,该病主要在玉米大喇叭口期——成熟期发生,发病高峰期在8月下旬至9月中上旬,此期间降雨量和温度对病害流行影响较大.品种抗性、海拔高度、种植密度及施肥水平也影响病害发生严重程度.化学防治药剂以苯醚甲环唑类、丙环唑类等防效较好.

The new disease,gray spot onmaize,caused by Cercospora zeae-maydis,was investigated in Dali Prefecture,Yunnan Province in 2006 and 2007.The results showed that the disease occurredmainly from the flared tomaturing period of maize and its peak was from the last ten days of August to the middle 10 days of September when the rainfall and temperature affected its severity.Besides,the disease was related to cultivar resistance,altitude,plant density and fertilizer amount.The chemicals such as difenoconazoles and...