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一、常见病害玉米小斑病:一般7月份的降雨量大小和小斑病的发病程度呈正相关,当病株率达70%时,病叶率才开始自下而上的发展;降雨早,病株率上升早;反之就晚。在病株率70%、病叶率20%时,若遇见中到大雨后,15天左右暴发。当病株率100%、病叶率30%时,又遇连阴雨天气,就要进行防治。先摘除玉米底部1-2片病叶集中销毁;喷洒50%多菌灵或70%托布津500倍液,或代森锰锌800倍液等。
First, the common disease of corn spot disease: the general rainfall in July and the incidence of small spot disease was positively correlated, when the diseased plant rate of 70%, the diseased leaf rate began to bottom-up development; early rainfall, The rate of diseased plants increased early; otherwise it was late. In the diseased plant rate of 70%, sick leaves rate of 20%, if you encounter moderate to heavy rain, about 15 days outbreak. When the diseased plant rate of 100%, the diseased leaf rate of 30%, in case of rainy weather, we must carry out prevention and treatment. First remove the bottom of the corn leaves 1-2 concentrated leaves destroyed; spraying 50% carbendazim or 70% Topaz 500 times, or Mancozeb 800 times and so on.