What insects grow on my cordate telosma? They are so dense and terrible. Can someone tell me what medicine to spray?

This is an aphid. Control: (1) plant ash (which can be burned with hay, and the ash left after burning) is soaked with water according to the ratio of 1:5, which is convenient for spraying to the places where the damaged plants have aphids. And it can supplement potash fertilizer, killing two birds with one stone. (2) Using black light according to the phototaxis of aphids is suitable for any occasion. It can kill aphids and avoid other pests. (3) Add 1g urea, 1.25g washing powder and 100ml water to make a small nozzle for liquid medicine, but it should not be used too frequently. (4) Use imidacloprid according to the packaging method.