Prevention and control method for cotton aphids

The invention discloses a prevention and control method for cotton aphids. The method comprises the steps that when cotton aphids occurs in a cotton field, a flonicamid pesticide is diluted through water and applied to cotton root areas through dripping, after the roots absorb the flonicamid pesticide, the flonicamid pesticide is conveyed to all parts of the cotton plant field, and the function ofpreventing and controlling the cotton aphids is achieved. The application amount of effective components of the flonicamid pesticide is 50-200 g/mu, and the application amount of water is 5-20 stere/mu. Preferably, dripping application is divided into three continuous steps: 1, 1/3 of the total water amount is used for dripping irrigation and used for wetting planting soil of cotton plants; 2, 1/3 of the total water amount is mixed with the flonicamid pesticide, and then the mixed solution is applied to the cotton root areas through dripping; 3, 1/3 of the total water amount is used for flushing a drip irrigation pip