The conker tree (Aesculus hippocastanum) is a popular ornamental tree in Britain, but it is under threat from a fungal disease called bleeding canker. This disease is caused by the fungus Phytophthora cambivora, which attacks the bark of the tree, causing it to bleed and eventually die.

Wasps can help to save Britain's conker trees by preying on the insects that spread the bleeding canker fungus. These insects include aphids, scale insects, and mealybugs. Wasps feed on these insects, reducing their numbers and preventing them from spreading the fungus.

In addition to preying on the insects that spread the bleeding canker fungus, wasps also help to pollinate conker trees. When wasps visit conker trees to collect nectar, they transfer pollen from one flower to another, helping to fertilize the flowers and produce seeds.

Therefore, wasps play an important role in the health and survival of Britain's conker trees. By preying on the insects that spread the bleeding canker fungus and by pollinating the trees, wasps help to keep conker trees healthy and productive.