Hollyhock rust affecting plant in garden. Hartwell, Northants.
24 June, 2018
Groundsel showing, on the right, the rust Coleosporium tussilaginis.
Daventry town centre. 23 June, 2018
Two days ago I encountered another example, this one affecting hawthorn in a rather bizarre manner.
Gymnosporangium confusum is one of the many species which apparently requires an alternate host, in this case an introduced species of juniper, Juniperus sabina. This is a popular garden plant but for this to be involved seems a little unlikely. However, there is evidence that this rust may not need the alternating host.