Plum rust (Tranzschelia pruni-spinosae var discolor) uredinia on the lower surface of a Victoria plum tree leaf in fruit, Berkshire, September

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Photo credit: © Nigel Cattlin / Alamy / Afripics
License: Licensed
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Keywords: abaxial, basidiomycota, berkshire, brown, crop, discolor, discreet, disease, domestica, england, fruit, fungal, fungi, fungus, leaf, orchard, pathogen, plum, pruni-spinosae, prunus, pustules, rosaceae, rust, september, stone, surface, tranzschelia, uk, uredinia, urediniae, urediniomycetes, uropyxidacxeae, var, victoria