知识讲座第三讲大豆病虫害大豆病虫害种类很多，但在东北以大豆孢囊线虫病、花叶病毒病、灰斑病、大豆蚜虫和大豆食心虫危害较重，不仅影响大豆产量，而且在种子上形成褐斑、灰斑或咬成虫口豆，降低大豆品质。霜霉病、细菌性斑点病、紫斑病、褐纹病、轮纹病、根腐病、草地... Lectures on knowledge Lecture 3 Soybean pests and diseases There are many kinds of soybean pests and diseases, but in the northeast, the diseases such as soybean cyst nematode disease, mosaic virus disease, gray leaf spot, soybean aphid and soybean borer are harmed seriously, not only affecting soybean yield but also forming on seeds Brown spots, gray spots or biting adult mouth beans, reduce the quality of soybeans. Downy mildew, bacterial speckle disease, purple spot disease, brown streak, ring rot, root rot, meadow ...