Maple fruit moth

Cydia inquinatana is a moth species belonging to the order Lepidoptera and the family Tortricidae. It is recognized as a specialist pest that targets the seeds of various maple species, causing substantial damage to the reproductive potential of these trees.

The primary host plants for this moth are various species within the Acer genus, including Acer platanoides and Acer campestre. The pest is predominantly found in managed forests, parks, and tree nurseries, where it focuses its feeding activity on developing samaras (winged seeds).

The biological cycle is univoltine, meaning one generation per year. The insect overwinters as a mature larva in a cocoon, hidden within bark crevices or organic forest litter. In the spring, the larvae pupate, and adult moths emerge to mate and lay eggs on the developing fruit. Upon hatching, the larvae bore into the fruit to consume the seed.

The damage caused by this insect is characterized by the internal destruction of the maple seeds, which typically leads to premature fruit drop and a significant reduction in the seed yield. Because the larvae feed inside the samara, the infestation often goes unnoticed until the seeds are harvested or failed germination is observed.

Effective management and protection strategies include:

• Monitoring adult flight populations using pheromone traps to time interventions accurately.
• Sanitation practices, such as the systematic removal and destruction of infested seeds to reduce overwintering larvae populations.
• Application of selective insecticides in nursery environments during the larval hatching stage when infestations exceed economic thresholds.
• Conservation of natural predators, such as parasitoid wasps, which play a crucial role in maintaining the ecological balance of the forest ecosystem.