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玉米螟玉米螟总体偏重发生,程度重于2011年,全国发生面积3.5亿亩次。其中,一代在东北大部大发生,华北北部偏重发生,新疆和西南大部中等发生,其他地区偏轻发生,全国发生1.5亿亩;二代在内蒙古中东部、辽宁中北部偏重至大发生,其他地区中等至偏轻发生,全国发生1.0亿亩;三代在山西偏重发生,其他地区偏轻至中等发生,全国发生1.0亿亩。北方玉米主产区玉米螟冬前
Corn borer borer borer overall bias occurred, the degree heavier than in 2011, the country occurred an area of 350 million mu times. Among them, most of the generation occurred in most of northeast China, while in north and north China, most occurred in Xinjiang and the southwest, while in other areas moderate occurred. There were 150 million mu in the whole country. The second generation occurred in central and eastern Inner Mongolia and central and northern Liaoning, In other areas, moderate to moderate light occurred, with a total area of 1.0 million mu across the country. Three generations were preoccupied in Shanxi Province while other areas were modest to moderate with 1.0 million mu nationwide. Corn borer in northern main producing area before winter