white rust (plant disease)
A fungal disease affecting plants, especially crucifers, caused by Albugo species. Technical term used in botany and agriculture.
White rust disease appeared on the cabbages.
White rust is commonly seen on cruciferous plants.
Compound of 白 (しろ, 'white') + さび (rust) + 病 (びょう, 'disease'), describing the white pustules characteristic of this plant disease.