What are the methods to control aphids?

To eliminate aphids, we should start from the wintering period of flowers; Strictly check the newly introduced flower seeds and seedlings to prevent the invasion of new pests from other places, disinfect the soil and old flower pots and kill the residual eggs; Combined with pruning, the residual flowers and diseased branches and leaves hidden by aphids or eggs are completely removed and burned centrally. When a small number of aphids are found, brush them with a brush dipped in water, or put the potted flowers obliquely under tap water for rotary washing; If possible, natural enemies such as ladybugs and lacewings can be used for control. When a large number of aphids are found, isolate them in time, prepare tobacco leaf water according to the ratio of 1: 15, soak for 4 hours and then spray; Prepare a solution of washing powder, urea and water, and spray it according to the ratio of 1: 4: 400; Spray with 10% omethoate emulsion 1000 times or malathion emulsion 1000 ~ 1500 times or dichlorvos EC 1000 times.