苗圃地下病虫害主要有烂根病、蛴螬、蝼蛄等,轻者苗木生长弱小,重者苗木死亡,造成缺苗断垄,严重影响苗木质量和产量,必须采取以下防治措施.1.整地施药 播种前5～7天,在做好的苗床上,用耙将10～15厘米厚的表土搂向两侧,然后将1%杀灭菊酯颗粒剂掺入50%的细沙拌匀,均匀撒于床面,然后把两侧的表土搂盖好,整平播种,用药量每平方米1～2克,播种前种子可 Nursery underground pests and diseases are mainly root rot disease, 蛴 螬, 蝼 蛄, etc., the light seedling growth is weak, heavy seedlings died, resulting in lack of seedlings broken ridge, seriously affecting seedling quality and yield, must take the following control measures. The first 5 to 7 days, in the well-made seedbed, with a rake 10 to 15 cm thick topsoil hug to both sides, and then 1% fenvalerate granules mixed with 50% fine sand and mix evenly On the bed, and then cover the tops of both sides of the cover, leveling sowing, the dosage of 1 to 2 grams per square meter, sowing seed before