Phytophthora Root Rot
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Phytophthora root rot (Phythophthora drechsleri). Cabbage is the main cole vegetable impacted by this disease. Infections occur during periods of high temperatures and when soils are saturated. Wilting and plant collapse are usually the first symptoms observed; a necrotic canker will be present at the soil line of affected plants and root decay is common. Tissues above the canker may have a purplish discoloration. Extensive spread of disease is common in poorly drained soil or during periods of heavy rainfall.
Wilting on cabbage caused by Phytophthora
(Photo: UKY Vegetable IPM Team, University of Kentucky)
Stem Canker on cabbage caused by Phytophthora
(Photo: UKY Vegetable IPM Team, University of Kentucky)
Management:
- Improve soil drainage.
- Crop rotation.
- Fungicides applied prior to planting.
