Root Rot, Phytophthora
Phytophthora spp.
15 host plants
Last updated
Phytophthora root rot causes decline and death of affected plants through root decay. Once in soil, this disease is difficult to eradicate. Rotation to new land or resistant varieties is necessary. Remove infected plants. Ensure excellent drainage. Proper drainage and good site selection are critical to prevent root disease problems. Monitor plants for early signs of decline or wilting Early detection and prompt management of symptoms help limit disease spread.
Root rots thrive in waterlogged soil, so drainage is your most important intervention. Avoid overwatering and ensure the planting site drains well. Remove severely affected plants to prevent spread to neighbors through root contact or contaminated soil. When replanting, choose resistant species or improve soil structure before putting anything back in the ground.
Quick Reference
Management
Cultural Controls
- Choose the right plant for the location and provide good cultural care.
- A healthy plant is more resistant to disease.
- Plant only disease-free materials.
- Remove and destroy all infected plants to prevent spread of the disease.
- Select resistant azalea species such as R.
- poukhanense or resistant cultivars such as 'Formosa', 'Fakir', 'Corrine Murrah', 'Merlin', or 'Hampton Beauty' for planting in infected areas.