Tanya shows how to determine whether aphids have been attacking plants and explains how to keep them at bay. To determine if a plant has been infested with aphids, look for leaves that are distorted, covered with mold, or shiny from a honeydew-type substance. If there are ants crawling in or around a plant, this is definitely a sign that it is infected with aphids, which produce a sweet, sticky substance that ants love to eat. They are usually green in color, but some species are brown, yellow, pink, or black. Most often, aphids are found on new growth because they crave nitrogen.
Ladybugs are a common natural predator of aphids.
Both the larva form and the adults prey on aphids, green lacewings and wasps. Many of these predators will only feed on nectar and pollen, so they can be encouraged by filling the garden with nectar-rich flowers and plants that produce large amounts of pollen. For minor infestations, try spraying plants with a mild soap solution, but keep in mind that some plants are easily burned by soap. Try the solution on just a few leaves first, then check them for burning and don't forget to rinse the soap off after treatment. To create an easy homemade insecticide soap, simply mix one tablespoon of mild dishwashing liquid and one quart of water.