从实验田和生产田调查中发现二化螟危害水稻造成的产量损失,第二代比第一代大,第二代中虫伤株造成的产量损失远比枯穗和白穗大;同时又发现同一品种在不同的种植密度下,虫伤株情况也不尽相同。作者探讨了同一品种、不同密度下虫伤株分布的 The results showed that the second generation was larger than the first generation, and the second generation had more yield loss than the dry ear and the white ear. However, at the same time Found that the same species in different planting density, insect pest strains are not the same situation. The authors explored the distribution of pest strains of the same species and density