Melampsora euphorbiae, a new rust disease found onEuphorbia rigidain Turkey.

The article presents information on melampsora euphorbiae, a new disease found on Euphorbia rigidain in Turkey. Euphorbia rigida occurs widely in Turkey and is a weed of gardens and uncultivated areas. Symptoms include the drying of leaves before normal flowering season. It occurred mostly on the lower surface of leaves and on stems. Melampsora euphorbiae has clear potential as biological control agent against other Euphorbia species. The rust disease poses more of a threat to the horticultural trade of E. rigidain at present.