Potato Late Blight Symptoms

Potato Late Blight Symptoms. Found on tomato and potato plants, late blight is caused by the fungus phytophthora infestans and is common throughout the united states. It affects potato, tomato and, occasionally, eggplant and other members of the potato.

Late blight is a destructive disease of tomatoes and potatoes. The initial symptom of blight is a rapidly spreading, watery rot of the leaves, which soon collapse, shrivel and turn brown.