地下害虫是农作物的大敌,牠们生活在土里,咬食植物根茎部,影响作物成长、收获,使单位面积产量减低。华北各省的地下虫害,一般以蝼蛄(俗稀拉拉蛄、土狗);金针虫(俗称姜虫、铁丝虫、扫苗虫等);蛴螬(俗称白地蚕、土蚕);地老虎(俗称切根虫、地蚕、土蚕);种蝇(俗称种蛆)等为害最重,这类害虫在防治上也极困难,甚至有些地方作物连种数次,亦得不到收获。就以蝼蛄来说,河北沙河全县耕地被害惨 Underground pests are the enemy of crops, they live in the soil, bite the roots of plants, affecting crop growth, harvest, so that yield per unit area. Underground pests in the provinces of North China, generally in order to 蝼 蛄 (vulgar sparse pull 蛄, dogs); insects pests (commonly known as ginger worms, wire worms, wipe the worm and so on); 蛴 螬 (commonly known as white silkworm, Cutworms, silkworms, silkworms); species flies (commonly known as maggot) and other damage the most, such pests in the prevention is also very difficult, and even some local crops with the number of times, there is no gain. To 蝼 蛄, Hebei Province, Shahe County, arable land miserable