淮北地区棉花苗期病虫主要有棉蚜、地老虎、棉蓟马和立枯病、炭疽病等。其中以棉蚜发生危害比较严重,常因防治失时或用药不当,造成棉苗大面积卷叶,影响其正常生长发育,甚至棉苗枯死;地老虎发生严重的棉田,常造成缺苗断垄,一般缺苗率在10％左右,部分田块在20％以上。在低温、高湿的环境条件下,有利于立枯病、炭疽病病菌的侵染,从而引起烂种、烂芽、烂根、叶片逐渐枯死或整株死亡。在枯 Cotton seedlings pests in Huaibei area are mainly cotton aphids, to tiger, cotton thrips and blight, anthracnose and so on. Among them, the occurrence of cotton aphid more serious harm, often due to lack of control or improper medication, resulting in a large area of ​​cotton leaf roll, affecting its normal growth and development, and even the cotton seedlings dead; , The general lack of seedling rate of about 10%, some fields in more than 20%. Under the conditions of low temperature and high humidity, it is conducive to the infection of the blight and anthracnose bacteria, causing the rotten seeds, the rotten buds, the rotten roots and the leaves to die or die completely. In the dry