Ailanthus webworm

The Ailanthus webworm (Atteva aurea) is a moth belonging to the order Lepidoptera and the family Attevidae. Despite its vibrant, colorful appearance, it is considered a significant pest, primarily known for its association with the tree of heaven (Ailanthus altissima).

This insect specifically targets the Ailanthus tree as its primary host plant. While it thrives on this species, the Ailanthus webworm has been observed feeding on other related plants, making it a nuisance in both urban landscapes and natural forest environments where the host trees are present.

The lifecycle of the insect is characterized by multiple generations per year. Female moths lay their eggs on the leaves or stems of the host tree. Upon hatching, the larvae work collectively to spin silk webs, which serve as their nests and protection from predators while they feed on the surrounding foliage.

The damage caused by the Ailanthus webworm is primarily due to defoliation. As the larvae feed in large colonies, they consume significant amounts of leaf tissue, often leaving only the veins behind. This activity results in the accumulation of frass and silk, which is aesthetically unpleasing and detrimental to the tree's overall vigor.

Effective management strategies rely on integrated pest control. Physical removal of webbed nests is highly effective for smaller trees. For large-scale infestations, applying systemic or contact insecticides during the early larval stages is recommended to prevent extensive foliage loss and protect the health of the host plants.