Get rid of aphids by attracting natural predators, spraying infested plants with water and applying insecticidal soap or insecticide. Prevent aphids from over-wintering on plants by cutting plants back in fall. Suffocate the remaining eggs by spraying plants with neem oil in early spring.
- Attract predators
Attract ladybugs, lacewings and other insects that feed on aphids by planting flowers and herbs such as dandelions, daisies, marigolds, sunflowers, dill, mint and fennel. One drawback of using insecticide on aphids is that it kills the predators that feed on aphids more readily than the aphids themselves. This sometimes increases the aphid population.
- Spray the plants with water
Apply a strong water spray to all sides of the plant to knock off the aphids and remove their sticky secretions. Repeat the spray every few days as long as aphids persist. The spray injures the aphids, making them unable to return to the plant.
- Apply insecticidal soap or insecticide
Spray insecticidal soaps over aphid-infested plants. The plants may need to be sprayed repeatedly during heavy infestations. As a last resort, use chemical insecticides. Some types of insecticide linger on the plants for a day or more. Others penetrate the plant and spread through the sap or are absorbed through the soil into the leaves. These are most effective, as they reach aphids that hide from spray insecticides in leaf curls.