郎府地区位于北京市东南郊，是北京地区第一个“三高”示范区及生产商品粮基地。现为京（北京）、津（天津）、廊（廊坊）高产示范带农业观光的窗口。但是，近年来由于小麦根蚜危害严重，使小麦生产受到了很大的影响。从１９９０年春，该地就有小麦根蚜的危害，但当时不知... Langfang area is located in the southeast suburbs of Beijing, Beijing is the first “three high” demonstration area and the production of grain base. Now Beijing (Beijing), Tianjin (Tianjin), Corridor (Langfang) high yield demonstration with agricultural sightseeing window. However, in recent years, due to the serious harm of wheat aphid, wheat production has been greatly affected. From the spring of 1990, there was a threat to wheat aphid, but at that time I did not know ...