Recent years have seen increased proliferation of these little critters, and the first ones of 2019 have been spotted in Leudelange. But in this case it was a false alarm.

A Facebook post showed what was initially believed to be oak processionary moth caterpillars on a tree along a cycling track in Leudelange. While the commune was alerted to their presence, "natur&ëmwelt" saw the article on RTL.LU and got in touch to confirm that they were not the feared processionary moths, but ordinary lackey moth caterpillars.

Previous years

Oak processionary moths (Thaumetopoea processionea) have been multiplying across the country for years. Not only do they damage trees, but they are also slightly noxious to human health.

The caterpillars are covered in hair that is poisonous to humans, mostly causing allergic reactions such as skin rashes, irritated eyes and respiratory systems, and even other symptoms such as fever and vertigo.

Last year, the ministries for health and for sustainable development issued information on preventive measures in German and French, and can still be accessed through and

In 2018, nests were found in many places in the city centre, on cycling paths and in Parc Le'h in Dudelange, which ended up closing its doors until National Day.

Caterpillars found in blackthorn or hawthorn bushes are usually harmless.

Here are some photos from 2018: