Potassium Phosphite Mixed with Other Fungicides Reduces Yield Loss to Downy Mildew on Collard

Fig. 2. Chlorotic and necrotic symptoms of downy mildew on a mature collard leaf from the lowest third of the plant.



Image from Plant Health Progress article:
Potassium Phosphite Mixed with Other Fungicides Reduces Yield Loss to Downy Mildew on Collard