Illinoia liriodendri

Tulip-tree aphid

Description

Illinoia liriodendri, commonly known as the tulip-tree aphid, is a sap-feeding insect that primarily inhabits the tulip tree (Liriodendron tulipifera). Native to North America, it was first recorded in Europe in France in 1998 and has since spread to other European countries, where it thrives in parks and gardens. The aphid exclusively feeds on the undersides of tulip tree leaves, forming dense colonies, especially during the growing season. Its life cycle begins with eggs overwintering in bark crevices, which hatch in spring as the leaves emerge. Populations increase rapidly, with viviparous females producing nymphs continuously throughout spring and summer.

Damage caused by Illinoia liriodendri primarily includes honeydew secretion, which fosters the growth of sooty mold, affecting both the aesthetic appearance and photosynthetic capacity of the host tree. Severe infestations may lead to leaf discoloration, premature leaf drop, and reduced tree vitality, though the intensity of damage varies. While the pest does not usually threaten tree survival, its impact on the tree’s visual appeal can be significant in ornamental settings.

Symptom

On the undersides of leaves, clusters of aphids are visible, often accompanied by honeydew deposits that lead to the growth of dark sooty mold. Leaves may display discoloration and distortion, sometimes resulting in premature leaf drop.

Tree Species: Tulip tree

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes