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Downy mildew was recently confirmed in an overwintered crop in the region by Washington State University (WSU). The recent isolated storms and cool weather have created favorable conditions for downy mildew outbreaks.
Overwintered onions with dense canopies are most at risk now. If you find downy mildew, be ready to apply a foliar fungicide before excessive spread occurs.
Click HERE to read a special issue of WSU Onion Alerts with information about managing downy mildew in the Columbia Basin. It includes several pictures of downy mildew symptoms and a guide for selecting fungicides to manage the disease.
