If you garden, you have likely encountered aphids on trees, shrubs or other garden plants in your landscape. Identifiable by their small teardrop-shaped bodies with cornicles, the two tail pipe-like structures that protrude from their back end. They come in a variety of colors, with or without wings, and some like the cabbage and wooly aphids are covered with a gray or white waxy substance. These insects feed on leaves, stems, flowers and roots…