Barberry Blight
the English name of a minute fungal, the æcidium berberidis of Persoon. It occurs on leaves of the barberry, forming roundish, bright red spots, consisting of the fruits of the æcidium, which form little cups full of spores when they burst. These spores germinate on the leaves or stems of wheat, send out mycelium into the plant, and produce the disease called rust.