Peronospora farinosa

Peronospora farinosa can cause yellowish swellings on the leaf blade of the host plants (Amaranthaceae sp. such as Fat-hen and Oraches) often affecting several leaves of the same plant. The affected leaves can become swollen and slightly distorted. This downy mildew can also have a purplish tinge.

Wherever the host plants occur.

When the host plants are in leaf.

Fairly widespread, particularly in the southern half of Britain.

Rare or under recorded in Leicestershire and Rutland.