How-To Features Tree Registry Register your trees for customized advice. Custom Care Kits Different trees have different needs. Virtually every plant has at least one aphid species that attacks it. These small insects are masters of reproduction and are often found in great numbers on stems or leaves.
Some species even feed on the roots of plants.
They range in color from green to brown, red, black or purple. Some species may even have different color forms in the same colony. Most have the soft exoskeleton exposed, but some species produce waxy, cottony strands which cover the body. These are often called woolly aphids. A hand lens may be needed to see the short cornicles of some species.