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本试验对4个玉米品种小斑病的发生规律进行了研究。结果表明,发生小斑病的叶片基本上是从下部第1～3张叶片开始逐渐向上蔓延的。在小斑病发生的早期,病情指数的增加主要是由于发病率的增加所引起的,后期主要是由于病级的增加所引起,且品种的抗病性影响了小斑病发生的早晚、轻重以及流行曲线的增长的快慢,抗小斑病的品种发病晚且轻,并且其流行曲线增长较慢,感病的品种与此相反。
In this study, the occurrence patterns of four maize leaf spot were studied. The results showed that the leaf spot of the occurrence of Skeletonema was basically spread upward from the first to the third leaflets in the lower part. In the early stage of small spot disease, the increase of disease index was mainly caused by the increase of the incidence rate. The later stage was mainly caused by the increase of the disease level, and the disease resistance of the cultivars affected the occurrence of small spot disease sooner or later, As well as the growth of the epidemic curve, the resistance to the squamous disease is late and mild, and its epidemic curve grows more slowly. The susceptible varieties are the opposite.