白洋淀是华北地区最大的淡水湖。白洋淀上游有 9条河流 ,俗称“九河下梢白洋淀”,现为国家一类蝗区管理县。解放前白洋淀 1 0年 9次决口 ,是历史上的老蝗区。新中国成立后 ,党和政府十分重视对东亚飞蝗的治理 ,并为控制蝗灾取得了宝贵的经验和举世瞩目的成就。但 2 0世纪 90年 Baiyangdian is the largest freshwater lake in North China. Baiyangdian upstream has 9 rivers, commonly known as “Jiuhe Xiaopian Baiyangdian Lake”, is now a national class locust management county. Baiyangdian 10 years ago liberation 9 burst, is the history of the old locust area. After the founding of New China, the party and the government attached great importance to the management of migratory locusts in East Asia and gained valuable experience and remarkable achievements in controlling locusts. But 90 years in the 20th century