Water damage on lower leaves
Hot soil damage on lower leaves
Fertilizer damage
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...
Early blight on leaves and stems On leaves, irregular, dark-brown lesions withconcentric rings. Usually, the lesions aresurrounded by yellowish areas....
Blackleg on stems Black lesions starting from theinfected seed tuber. Infectedstems usually have a strongfishy smell caused by secondarybacteria that...