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Pests and diseases

Here is an overview of common pests and diseases in nature.

Asian hornet

If you spot a nest of Asian hornets, please report it to the hotline and your local municipality.

Japanese knotweed

Japanese knotweed spreads at lightning speed. It is not without reason that it is considered one of the most invasive exotic species.

Oak Processionary Caterpillar

The caterpillars of this moth can be found from April to July on pedunculate oak and sometimes on beech and birch.

Rats

Rats are found wherever people live. Do you see a rat? Report it to the municipality.

Bird flu

Do you see (a) sick or dead bird(s) in Zoetermeer? Read what you can do.

Blue-green algae

Blue-green algae are mainly found in fresh stagnant water such as ponds but also in swimming pools.

Elm Disease

A number of elms in Zoetermeer are affected by Dutch elm disease. These trees are being cut down by the municipality.

Water crassula

Water crassula is a fast-growing plant, making it a threat to other aquatic plants and water quality.