Eastern maple leaf-tier

Systematic position: Proteoteras willingana is a species of moth within the Tortricidae family, belonging to the order Lepidoptera. This insect is a specialist herbivore known to be a significant pest specifically for maple tree species (Acer).

Host plants: The primary hosts for this species are various maples. It is a problematic pest in nursery settings, urban landscapes, and young forest plantations, where it targets the growth-critical parts of the trees, affecting both their vertical development and overall health.

Biology and life cycle: Like other Tortricids, it undergoes a complete metamorphosis. It overwinters primarily as a larva within protective sites such as bark crevices. In the spring, larvae emerge to feed on developing buds. Depending on the geographical region, the pest may complete one or more generations per year, with adult moths being active during the summer months.

Damage and economic significance: The larvae cause damage by boring into and feeding on the interior tissues of terminal buds and young shoots. This feeding behavior destroys the terminal meristem, often resulting in stunted growth, dieback of the leader shoot, and the formation of lateral branches, which severely degrades the timber quality and the shape of the tree.

Protection measures: Management of Proteoteras willingana requires a combination of vigilance and targeted treatments:

• Monitoring of larval emergence using pheromone traps and visual inspections of buds.
• Pruning and destroying infested twigs and terminals to reduce the local population.
• Timing applications of biological insecticides (such as B. thuringiensis) to coincide with early larval feeding stages.
• Applying systemic insecticides in high-risk nursery blocks if the infestation density threatens tree survival.