The horse chestnut tree is a common sight in the UK, and its conkers are a popular toy for children. However, the tree is under threat from a disease called bleeding canker, which can kill the tree within a few years. Wasps may be able to help save the horse chestnut tree by preying on the insects that spread the disease.

Bleeding canker is caused by a fungus called Phytophthora cambivora, which is spread by a species of longhorn beetle called Agrilus planipennis. The beetle lays its eggs in the bark of the tree, and the larvae feed on the tree's cambium, which is the layer of tissue that carries water and nutrients between the roots and the leaves. This damage causes the tree to bleed, and it can eventually kill the tree.

Wasps prey on longhorn beetles, and they can help to reduce the population of beetles that spread the disease. Wasps also help to control the population of aphids, which are small insects that feed on the sap of the tree. Aphids can also spread diseases, and they can weaken the tree's defenses against bleeding canker.

In addition, wasps help to pollinate horse chestnut trees. When wasps visit the flowers of the tree, they transfer pollen from one flower to another. This helps to ensure that the tree produces fruit, which is essential for the tree's reproduction.

In summary, wasps can help save Britain's conker trees by preying on the insects that spread bleeding canker and by pollinating the trees. Wasps are an important part of the ecosystem, and they play a vital role in protecting our trees.