Economic Thresholds None available. Control Tips Effective control of this disease requires implementing an integrated disease management approach. Resistant cultivars and fungicides can also be utilized. Select varieties with resistance to late blight wherever practical. Various publications available through agricultural representatives provide information on resistant varieties.
Fungicides are most effective if applied when the canopy begins to close within the row.
Applications should continue, as needed, throughout the growing season. Complete coverage is essential when using protectant fungicides. If late blight is present in a field, a combination of protectant and systemic fungicides should be used. Consult the provincial Guide To Crop Protection for information on currently approved fungicides.