rust of currant. disease on black currant leaves caused by a fungus cronartium ribicola

agriculture animal attack background black blister branch bush caused closeup color cronartium cure currant damage disease diseases dying environment flower foliage food fungal fungus garden grass green growth herb host ill infect infection insect invertebrate leaf leaves macro natural nature nigrum orange petal pine pinus plant produce protect protection ribes ribicola rust rusty season shrub spores spots strobus summer symptoms tree underside wildflower yellow yellowing