Early blight on leaves and stems
Grey mold on leaves
Lightning damage Plants look dead or wilted. The stem base has a blanchedappearance. Hydraulic liquid damage Hydraulic liquid dropped from...
Air pollutants Air pollutants cause dark lesionson leaves that resemble lateblight, but no yellowish halosurrounds the lesions. No whitefungal growth...
Water damage on lower leaves The tips of leaflets look water-soaked and aresurrounded by a yellowish halo. No myceliumdevelops as...
Blackleg on stems Black lesions starting from theinfected seed tuber. Infectedstems usually have a strongfishy smell caused by secondarybacteria that...