Hello @afterglow, the best measure is prevention, I insist that it is important to check the plants every day, especially the underside of the leaves, which is the place where pests lay their eggs. Prepare the insecticide and repellent based on NEEM leaves, orange peel and soap and fumigate every 5 days, if you detect the presence of something white and cottony on the underside of the leaves, proceed to wash the leaves with the NEEM liquid, those aphids they are weak. Greetings.