推广抗病品种是防治病害的最经济有效的措施。为了进一步搞好抗病育种工作和品种合理布局,稻瘟病菌生理小种的研究显得十分重要。一九五九年前我省引进和推广农林16、三冬早等粳稻,起初大田并不发病,但后来发病严重,从粳稻上分离的菌株在籼稻品种南特号上接不上,从南特号上分离的菌株在粳稻上也 Popularizing disease-resistant varieties is the most economical and effective measure to prevent diseases. In order to further improve the breeding of disease-resistant varieties and reasonable layout, the research of physiological races of Magnaporthe grisea is very important. Before 1959, our province introduced and promoted agriculture and forestry 16 and early winter three-year-old japonica rice. At first, the field was not affected, but later the disease was serious. Strains isolated from japonica rice could not reach the indica variety Nante, Special strains isolated strains in japonica rice also