cronartium

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Rust of currant. Disease on black currant leaves caused by a fungus Cronartium ribicola Royalty Free Stock Photo

White pine blister rust on currant leaves, Cronartium ribicola

On currant leaves, we often notice that they become mottled with yellow and brown spots. This is a sign that the currant is damaged by the fungus Cronartium ribicola. In July, yellow spots appear on the upper side of the currant leaves, and on the lower side, bright yellow beds of annual spores. Heavily infected foliage dries up and falls off, leaving the plants completely bare.