Nathan from Clinton Tn writes
Bonide Captin Fungicide is not labeled for Phytophthora blight so we would not recommend it for this use. Bonide Mancozeb Flowable with Zinc Concentrate seems to be a product that others have had success with but this blight is normally treated non-chemically by avoiding planting in wet or poorly drained areas. Remove and destroy infected plants.
Answer last updated on: 06/17/2014