张掖市玉米瘤黑粉病及锈病发生进程初探

The process of corn smut and corn rust in Zhangye area

对张掖地区玉米瘤黑粉病和玉米锈病的发生进程进行了研究.结果表明:玉米瘤黑粉病7月初发病,并同期进入快速发病期,7月底达发病高峰期,7月份是该病害的防治关键期;玉米锈病7月初开始发生,7月中旬进入快速发生期,中下部叶片发病重于上部叶片,7月中旬为该病害防治始期.

The process of corn smut and corn rust were studied in Zhangye area.The results showed that corn smut occurred at early July,and also entered a period of rapid growth.The peak of incidence happened at the end of July and the key period of controlling corn rust was July.The corn rust occurred at the beginning of July,and entered a period of rapid growth at mid-July.The corn rust was more at middle or lower leaves than that at upper leaves.The mid-July was the beginning of the disease control.