Aphis viburni

Viburnum aphid

Description

Aphis viburni, commonly known as the viburnum aphid, primarily infests Viburnum plants, especially Viburnum opulus. These aphids are slate-colored, brownish-green, or dark brown, often with wax spots on the abdomen. They cause leaf curling and the formation of leaf galls, which provide shelter for both the aphids and attendant ants. Aphis viburni overwinters in the egg stage. The eggs are laid in autumn on the bark or buds of Viburnum and remain dormant through the winter. These eggs hatch in spring, giving rise to the first generation of aphids, which begin feeding on the emerging leaves. Aphids feed by sucking plant sap, which may lead to stunted growth. Ants often attend these aphids, protecting them from predators in exchange for honeydew. Aphis viburni does not switch hosts and remains on Viburnum year-round. The damage may affect the plant's ornamental value.

Symptom

The main symptom of Aphis viburni infestation is the formation of galls on the leaves of viburnum plants. These galls result from leaf curling caused by the aphids feeding on plant sap. Affected leaves become distorted, curled, and may display discoloration. In severe cases, the galls and leaf damage can lead to reduced plant vigor and stunted growth. Additionally, honeydew excreted by the aphids can attract sooty mold, further affecting the plant's appearance.

Tree Species: Guelder Rose

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes