Wilkinson’s pine processionary moth

Wilkinson’s pine processionary moth (Thaumetopoea wilkinsoni) is a destructive lepidopteran species belonging to the Notodontidae family. Recognized as a significant forest pest, it primarily affects coniferous trees within its native range, causing extensive defoliation and weakening forest stands across the Eastern Mediterranean and the Near East.

The primary hosts for this moth are various species of pine, with a strong preference for Pinus brutia and Pinus nigra. The larvae (caterpillars) are gregarious, feeding collectively on the needles. Early instars damage the needle surfaces, while later stages consume the foliage entirely, often leading to total crown baring if the infestation is severe.

The life cycle typically spans one year. Adult moths emerge in the summer, and after mating, females deposit egg masses on pine needles. The larvae hatch and construct distinct silken nests on the branches where they overwinter. In the spring, they descend from the trees in their characteristic processionary columns to pupate in the soil.

The impact of this pest is twofold: ecological and public health-related. Heavy defoliation reduces tree vigor, making forests more susceptible to secondary attacks by wood-boring insects. Furthermore, the larvae are covered in urticating hairs containing a protein toxin that causes severe skin rashes, respiratory distress, and allergic reactions in humans and domestic animals.

Integrated Pest Management (IPM) is essential for controlling this moth. Strategies include manual removal and destruction of overwintering nests, the application of bio-insecticides like Bacillus thuringiensis, and the deployment of pheromone traps to disrupt mating cycles. In large forest areas, aerial treatments with growth regulators or selective insecticides may be employed to manage population surges effectively.