Early Blight (Alternaria solani) of Potato

Thursday, June 19, 2014

Primary damage to potatoes by early blight is attributed to premature defoliation of the potato plants, which results in tuber yield reduction.  Initial infection occurs on older leaves with concentric dark brown spots.  Disease severity is highest when potato plants are injured, under stress or lack proper nutrition.

Please consult the 2014 Potato Crop Weed and Pest Control Guide for information on control options.