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山东胶东地区甜菜夜蛾在大葱上发生为害情况可拔下植株观察，在茎上有无水渍状斑，根是否变褐，剪断地面部分的茎看维管束是否变褐色，以此症状进行确诊。也可根据患病部分呈现水浸状，组织变软腐败进行判断。但为了谨慎，还应把患病组织取火柴头１／２大的小块放置新鲜黄...
In Shandong Jiaodong beet armyworm on the green onion damage can be unplugged plant observation, the presence of water stains on the stem spot, the root is brown, cut the ground part of the stem to see if the vascular bundle is brown, the symptoms were diagnosed . Can also be part of the disease was flooded, soft tissue corruption to judge. However, to be cautious, you should also take the diseased tissue to match the first half of the big piece of fresh yellow ...