Galls on Nettle

Swellings on Common Nettle leaves

These swellings on Common Nettle (Urtica dioica) are caused by gall midge Dasineura urticae. The swellings contain several midge larvae (occasionally one). The galls range in colour from pale green (as in the photo) to purple.

Nettle Clustercup Rust

This swelling is caused by the rust fungus Puccinia urticata. Commonly it affects the stem but also affects the leaves as well.

All photos – Ashley Watson.