根据各蝗区2010年秋残蝗面积、密度及2011年春季以来蝗卵调查情况,结合历史资料,预计2011年山东省东亚飞蝗夏蝗中等发生,环渤海湾地区偏重发生;发生面积400万亩,三龄高峰期将在6月上旬。预报依据:1、秋残蝗的面积较大、密度略高。据各有蝗市统计,全省上年秋残蝗面积286.7万亩,比2009年 According to the investigation on the area and density of the locusts in the autumn of 2010 and the investigation of locust eggs since the spring of 2011, combining with the historical data, it is estimated that locust locusts (Locusta migratoria manilensis) occur moderately in 2011 and the areas around the Bohai Bay area are prevalent; the area of ​​400 mu The third peak will be in early June. Forecast based on: 1, Achilles locust larger area, slightly higher density. According to the statistics of each locust city, the area of ​​autumn locusts in the province last autumn was 2.87 million mu, more than in 2009