These bags, hanging from a white ring at their base, are not casual litter but traps designed to capture oak processionary moths.
Toxic to humans and pets
The moths, notorious for their toxic stinging hairs, pose serious health risks to both humans and animals. The hairs contain a nasty substance called thaumetopoein, causing severe reactions if a person or animal comes into contact or inhales it.
This danger is particularly acute for dogs, whose curiosity can lead them directly into harm's way.
Moth traps
The black bags, known as EPS traps, are used to control the spread of these hazardous caterpillars. They work by luring the moths into a tube with pheromones, trapping them inside with a smooth interior that prevents escape. Weighted down with sand and exposed to sunlight, the trapped caterpillars eventually desiccate, minimising the risk of their poisonous hairs becoming airborne.
The first sighting of the oak processionary moth in the UK was in London in 2006 and it has continued to spread. The moth was accidentally brought to the UK as eggs in the canopy of trees imported for planting.
For dog owners and anyone walking outdoors, recognising and avoiding these traps, especially during May and June, is essential for pet safety. If you spot these black bags, ensure your pet doesn't go anywhere near them.
It's always better to be safe than sorry when it comes to your beloved canine companion!
