Plane leaf miner

The plane leaf miner Phyllonorycter platani is a moth species belonging to the order Lepidoptera and the family Gracillariidae. It is a specialist pest that has become widespread in regions where plane trees (Platanus) are cultivated, causing significant ecological and aesthetic impact.

The primary hosts of this insect are species within the genus Platanus. The larvae feed on the leaf tissue, creating mines that create visible blotches on the foliage. While these trees are resilient, repeated annual infestations can cause stress that makes the trees susceptible to secondary diseases.

Regarding its biology, the moth completes multiple generations within a single year depending on the climatic conditions. The larvae develop entirely within the leaf blade. As they feed, they create narrow galleries that eventually expand into characteristic white or brown blotch mines.

The damage caused by the larvae primarily affects the photosynthetic capability of the tree. When the infestation is severe, premature leaf drop occurs, which can be seen in late summer. This loss of foliage leads to a decline in tree vigor and can reduce the tree's growth rate over successive seasons.

Effective control measures require an integrated pest management approach. Key strategies include:

• Sanitation, such as the removal and destruction of fallen leaves during autumn to eliminate overwintering pupae.
• Monitoring flight periods of adult moths using pheromone traps.
• Applying selective insecticides or biological agents like Bacillus thuringiensis during the early stages of larval development.