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根据各蝗区2014年秋残蝗面积、密度及2015年春季挖卵调查情况,结合历史资料,预计2015年我省东亚飞蝗夏蝗中等发生,黄河滩区和内陆滨湖蝗区局部可能出现高密度点片。发生面积约390万亩,达标面积约300万亩。预计发生期接近常年略偏早,较去年偏晚约2-3天,其中,出土始期:南部蝗区为4月底,北部蝗区为5月上旬;三龄蝗蝻高峰期:6月上中旬。预报依据:1、秋残蝗面积较大、密度较高。去年9月下旬全省对秋残蝗进行了普查,普查面
According to the investigation on the area and density of the locusts in autumn in 2014 and the investigation of the eggs laid in the spring of 2015 in the locality, combined with the historical data, it is estimated that locust locust occurs moderately in 2015, and the density of locusts in the Yellow River beach area and inland locust locust area may be high Point piece. Occurrence area of about 390 mu, up to an area of about 300 mu. It is estimated that the period of occurrence will be slightly earlier than usual, about 2-3 days later than last year. Among them, the period of the unearthed period is as follows: the southern locust area is the end of April and the northern locust area is the early May; the third locust locust peak is the middle of June. Forecast based on: 1, autumn leaves a large area, high density. In late September last year, the province carried out a census of the autumn residue locusts, census