orange rust

American  

noun

Plant Pathology.

1. 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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Example Sentences

Carrying notebooks and pens, they inspected the compact car, stained with dark orange rust.

From Seattle Times • Oct. 12, 2017

While the other containers were brightly colored and marked with company logos, this one was black with big patches of orange rust.

From "City of the Plague God" by Sarwat Chadda

The orange rust, which attacks the blackberry also, is a serious trouble.

From Home Vegetable Gardening — a Complete and Practical Guide to the Planting and Care of All Vegetables, Fruits and Berries Worth Growing for Home Use by Rockwell, F. F. (Frederick Frye)