Vinca Sudden Death: Root Rot Diagnosis and Fungicide

Vinca Sudden Death: Root Rot Diagnosis and Fungicide

Newly planted vinca (periwinkle) wilting and dying in rows (domino effect) after month of vigor: classic root rot (Pythium/Phytophthora) spreading plant-to-plant via soil water.

Action

1. Pull dying plants; check roots: black, mushy, white fungal growth on stem = root rot.
2. Drench remaining plants with Daconil: 2–3 tsp/gallon, ¼–½ cup per plant.
3. Reduce watering; vinca tolerates dry conditions.

Prevention

• Plant in well-drained soil.
• Space for air flow.
• Avoid overhead irrigation.

Early drench can stop spread; advanced rot requires replanting.