Aphids Are Small, Sap-Sucking Insects
Aphids are small, soft-bodied insects that feed on plants’ sap using their long, slender mouths to pierce stems, leaves, and other tender plant parts. Aphids have pear-shaped bodies with long legs and antennae that may be green, yellow, brown, red, or black, depending on the species and the plants they feed on.
What Trees & Shrubs Are Affected By Aphids?
With over 350 species of aphids, these pests typically aren’t picky about what trees and shrubs they affect. However, they typically prefer trees with large and thick leaves such as oaks, poplars, elm, and others.
What Are The Signs Of Aphids?
High concentrations of aphids can all be found in dense groups on the underside of leaves and stems. They produce large amounts of a sugary liquid waste called “honeydew,” which covers the leaf surface and twigs, or drops to the ground and creates sticky residue on vehicles, patio furniture and walkways. This sticky residue develops a dark purple “sooty mold” and may turn affected leaves and surfaces black.
Managing Aphids In Your Trees
Early detection is essential in managing aphids and reducing infestations. Since aphid infestations cannot be predicted, plants need to be checked often to determine the need for treatment and control. Aphids can also transmit diseases between trees, so it is crucial to manage their populations.
Dormant oils and application of broad spectrum insecticides can prevent aphids build up or control existing populations. Treatments should be prescribed and applied by knowledgeable arborists that are ISA certified and properly licensed. They are trained and certified to use these materials safely.