Short pest overview:
Is a major pest in many European countries and threatens the health of oak trees. The larvae cause severe defoliation, reducing the viability of oak trees. They also pose a risk to both human and animal health because they shed poisonous hairs, which can result in severe allergic reactions, amongst other health problems.
The moth is native to Central and Southern Europe but is now present in almost all European countries and also in parts of the Middle East.
The eggs are laid in batches of up to 300, on 3-5 year old branches and hatch the following spring during bud burst on early-leafing trees. There are 6 larval instars, typically developing from midApril to early August, in the UK. The pupal stage lasts for 40 days and the adults live for 3-4 days, on average.