本方法是将棉花抗病品种预先筛选其抗病性，然后通过确定的病圃土壤中接种单元数目，在一定的温度、湿度、ｐＨ值、日光照射的土壤中，使接种植株１００％发病；再将土壤中接种单元提高１０倍，在同样条件下待测植株。采用本方法，播种前就可防止棉花病害品种流入棉田，从而起 In the method, cotton resistant varieties are pre-screened for disease resistance, and then the inoculated plants are made to have 100% incidence by determining the number of inoculated units in the soil of the nursery garden in a certain temperature, humidity, pH value and sunlight exposure; The soil inoculation unit and then increased by 10 times under the same conditions to be tested plants. By using the method, the varieties of cotton diseases can be prevented from flowing into the cotton field before sowing, thus starting up