Rusty-shouldered button moth

The Acleris ferrugana is a member of the Order Lepidoptera and the Family Tortricidae. This species is commonly known as the rusty-shouldered button moth. It is recognized for its adaptive behavior and its role as a minor to moderate defoliator in woodland ecosystems across its native range.

This pest primarily attacks various species of deciduous trees. Its preferred host plants include birch (Betula), beech (Fagus), oak (Quercus), and alder (Alnus). While mature trees can usually withstand light infestations, young trees in nurseries or newly planted saplings can suffer significant physiological stress.

The biological cycle of Acleris ferrugana involves several developmental stages: egg, larva, pupa, and adult. The adults typically emerge in late summer or autumn and overwinter in sheltered locations, such as under tree bark or within leaf litter. Following the winter dormancy, mating occurs, and females lay eggs on the host foliage.

Larval feeding habits are the primary cause of damage. The caterpillars spin silk to roll or fold leaves into protective shelters. Inside these rolls, they feed on the leaf tissue, often causing skeletonization. Severe infestations can lead to partial or total defoliation of the tree, which negatively impacts the tree's ability to store nutrients for the following season.

Effective management strategies combine cultural and chemical control measures. Key recommendations include:

• Regular monitoring of canopy density during spring.
• Physical removal of rolled leaves in small-scale plantings.
• Application of selective biological insecticides like B.t. when larvae are in the early instars.
• Maintaining healthy tree vigor through proper irrigation and soil management to reduce vulnerability.