Oak processionary moth

Distinguishing Feature - Almost exclusively oak trees are affected

Not every conspicuous web on a tree is caused by the oak processionary moth. Its nests are often mistaken for the webs of harmless webworms.

An important distinguishing feature is the host tree: The oak processionary moth is found almost exclusively on oak trees. Its caterpillars are heavily hairy and often move in characteristic “processions” one behind the other. Their fine stinging hairs can cause skin irritation and allergic reactions in humans.

Webworms, on the other hand, primarily infest shrubs and other tree species. They often completely cover the plants with white webs, and their caterpillars do not have stinging hairs that are harmful to human health.

How the Body Reacts

The very fine stinging hairs of the oak processionary moth contain a protein toxin. This can cause allergic reactions in humans, such as skin irritation. In rare cases, irritation of the conjunctiva may occur, and in very rare cases, it can lead to respiratory tract irritation or even asthma attacks. You don’t even have to come into direct contact with the caterpillar itself, as the hairs break off easily and, under favorable weather conditions, can be carried over long distances. Infested areas should therefore be avoided.

Proper Precautions

After contact with the caterpillar hairs, itching may develop, which can be followed by a rash.

• Children in particular should not touch the caterpillars
• Affected areas should be avoided whenever possible
• Protect areas of skin such as the nape of the neck, neck, and forearms with clothing
• It is recommended that, after contact with the caterpillars, you take a shower and wash your hair, and thoroughly wash the clothing worn during the exposure in the washing machine at 60 degrees.

Residents who discover infested oak trees on city-owned property can report this by providing the exact location via the defect reporting system at www.erlangen.de/melder. The respective property owners are responsible for controlling infestations on oak trees located on private property.

Detailed information is available on the website of the Federal Environment Agency.