Oak processionary moth
reducing the viability of oak trees. However, this is usually less of a problem as the trees normally recover from this. More important is the health risk posed [...] allergenic for months. From the 5th instar on, the larvae start building silken nests at the base of lower branches, on the trunks or at the base of the trunks [...] their nests during the day leaving at night in a characteristic procession to feed in the canopy of the trees. If the leaves on a tree become scarce, the