A potato infected with powdery scab and shedding spores.

Powdery scab a puzzling potato problem

Biosecurity helps avoid powdery scab infections in Manitoba potato fields, like avoiding the use of manure from livestock that ate infected potatoes

Soil-borne potato disease powdery scab thrives in cool, moist conditions and is hard for crop researchers to study, but there are things Manitoba farmers can do to keep it out of fields.