通过对野外和稻田中华稻蝗发生规律的调查 ,其结果表明 :中华稻蝗主要以 3龄以上虫态于7月初开始向稻田转移 ,7月中旬大量进入稻田 ,稻蝗的虫口密度与水稻产量结构及产量损失之间存在明显的线性回归关系 ,其回归方程为 :千粒重与虫口密度关系为 Y=2 6.1 53- 0 .3955x(r=- 0 .948) ,产量损失与虫口密度关系为 Y=5.1 1 9+1 .866x(r=0 .91 67) The investigation on the occurrence of Oxya chinensis in the field and paddy field showed that the Oxya chinensis mainly migrated to the paddy field in the third instar or more in early July and entered the paddy field in mid-July. The population density of Oxya chinensis and the rice yield There was a significant linear regression relationship between structure and yield loss. The regression equation was: the relationship between grain weight and population density was Y = 6.153-0.3955x (r = -0.948), the relationship between yield loss and population density was Y = 5.1 1 9 + 1 .866x (r = 0.91 67)