清苑县五区一带,近年来麦杆蝇发生日渐严重,五一年一般麦田有三分之一以上不能抽穗,造成了很大的损失。五区系九龙、龙泉等河会合处,地势低洼,河水经常泛滥,土壤变迁很大,靠河附近田地常被盖上牛尺到尺半的河泥,因此种植庄稼, Qingyuan County District, in recent years, the serious occurrence of wheat stem flies, wheat fields in May more than one-third can not be heading, resulting in a great loss. Five districts of Kowloon, Longquan and other river will be co-located, low lying, frequent flooding of the river, the soil changes greatly, often by the river near the field covered with a foot to a half foot of river mud, planting crops,