noun Plant Pathology.
a disease of blackberries and raspberries, characterized by an orange, powdery mass of spores on the undersides of the leaves and stunted, misshapen foliage, caused by a rust fungus, Gymnoconia interstitialis.
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Words nearby orange rust
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020