Phytophthora Dieback
Phytophthora spp.
24 host plants
Last updated
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
Phytophthora causes dieback of branches and shoots, particularly during cool, wet weather. Once in soil, this disease is difficult to eradicate. Rotation to new land or resistant varieties becomes necessary for future plantings. Remove infected plants and improve drainage. Prevention through site selection is more effective than treatment. Monitor your plants closely and implement integrated management strategies. Prompt removal of infected material helps limit disease spread.
Good sanitation is your most effective tool against phytophthora dieback. Remove and dispose of infected plant material, clean up fallen debris, and sterilize your pruning tools between plants. Reduce leaf wetness by watering at soil level and spacing plants for adequate air movement. These practices reduce the pathogen load in your garden over successive seasons.
Quick Reference
Management
Cultural Controls
- Improve soil drainage through amending with compost or sand; avoid waterlogged conditions. Plant on raised beds or slopes where possible.
- Avoid overwatering; reduce irrigation frequency and duration. Apply water at the soil line, not on foliage.
- Plant on well-drained sites and avoid low-lying areas prone to water accumulation.
- Remove and destroy infected plants and roots. Do not compost diseased material.
- Use disease-free nursery stock; inspect incoming plants carefully and discard any showing symptoms.
- Improve air circulation around plants with proper spacing and pruning.