Madison Ave., Wooster, OH 44691. New strains of potato late blight may resist a key systemic fungicide used to control the disease. Select disease-free seed potatoes. Destroy volunteer potato plants quickly.
Scout fields regularly.
Follow a protectant fungicide program. And harvest two to three weeks after vines are dead. Based on a presentation by Randall Rowe, plant pathology professor, at the Ohio Fruit and Vegetable Growers Congress, Feb. 8, in Toledo. Some water may be less than ideal for growing plants. Growers may want to consider testing samples several times a year.