A walk with the dog through the forest, horses quietly grazing along an oak avenue or cows lazily lying in the meadow: it is an everyday picture. But it is precisely in those places that a less friendly guest also appears at this time of year: the oak processionary caterpillar.
The caterpillar itself may look harmless, but the stinging hairs it releases can cause a lot of misery. This is now well known to people: itching, red bumps and irritated eyes.
The chance of this is greatest in the months of June, July and August. Then the caterpillars are active and release their tiny stinging hairs. They are so light that they can easily float through the air and can also cause problems further down the road.
They can even remain in mown grass or hay, which increases the risk to grazing animals such as cows and horses.
If the stinging hairs end up in the mouth or airways, it can cause significant irritation. Consider swelling of the lips or tongue, inflamed mucous membranes in the mouth and problems with breathing.
Dogs often show other signals: a lot of drooling, gagging or difficulty swallowing. In some cases it can become really serious if a lot of hair has entered.
In Drenthe, places with many oak trees are particularly risky. Think of forest edges, village greens, avenues and roadsides where the trees are close together. The danger can also linger for a long time under an infected tree itself, because the stinging hairs end up in the grass.
The province therefore advises not to let dogs sniff or play around trees where the caterpillar is located. Pasture animals should not graze within approximately ten meters of such a tree. Using grass from those types of areas for hay or silage is also not recommended.
If an animal does come into contact with the stinging hairs, it is important to act quickly. In mild cases, it may help to gently rinse the mouth, eyes or skin with water to reduce irritation.
But with more serious complaints such as swelling, tightness or persistent drooling, it is important not to wait. The NVWA advises you to contact a veterinarian immediately. This can provide targeted treatment to limit pain, swelling and further damage.
The oak processionary caterpillar is an annoying creature for humans and animals, but the animal still has its uses. Great tits and other birds such as starlings enjoy a delicious meal from the furry guests and are not bothered by the stinging hairs.