MacDonald's restaurants use 3.2 billion pounds of potatoes a year.
Airborne sporangia are capable of travelling great distances in the wind.
Mycelium survives in living tissues of tubers and thus over-winters in storage or as volunteer potato plants in the field. Symptoms first appear on older leaves soon after flowering, following wet, humid weather conditions. Dark green, water-soaked areas at the leaf margins spread inwards and later become dark brown and brittle. There is a fluffy white growth found on the underside of the leaves when humidity is high. Symptoms on tuber appear as irregular brown to purplish sunken lesions , often appearing around the eyes .