How to Control Aphids. Aphid infestations can destroy an entire plant, and if left untreated, they can spread to surrounding plants, as well. These pests .There are approximately , aphid species found throughout the world. Low to moderate numbers are usually not harmful to plants and rarely require aphid control..Act quickly at the first sign of an aphid infestation as aphids reproduce quickly and can give birth to live young. Organic knockdown sprays like insecticidal soap .Predatory insects such as ladybugs will help to keep aphids under control. Trap the aphids. Sticky yellow cards are effective traps for aphids..
A strong spray of water from a hose will knock many of the aphids off the plant, and they won t be able to return. It also rinses off some of the honeydew. Spray the plant every day until the plant is aphid free. Grow plants for a homemade aphid control..