- 1). Consider removing the palm and destroying all debris. This may be the most suitable treatment option if there are other prized, uninfected trees or ornamental plantings nearby that could potentially become infected.
- 2). Alter the environmental conditions that favor the development and spread of the disease. Dry out the root mass. Decrease irrigation and improve drainage around the palm through vertical mulching or other means.
- 3). Drench the soil around the palm with a suitable fungicide. Fungicides that contain aluminum tris may control Phytophthora and Pythium. Thiophanate-methyl may be applied to address Fusarium but will not control Pythium or Phytophthora species. Jim Downer of the University of California Cooperative Extension also notes that metalaxyl is sometimes utilized as a nostrum for root rot, although this has not been thoroughly researched.
- 1). Remove the palm from the container. If root rot is extensive and the plant is not salvageable, discard the plant, destroy any debris, and clean the container.
- 2). Prune the roots. Remove any decayed roots using a pair of sharp scissors or pruning shears. Sanitize the cutting tools after cutting infected roots to prevent the spread of disease.
- 3). Sanitize the container by soaking it in a 10 percent bleach solution for 30 minutes.
- 4). Re-pot the palm in new, pasteurized soil that will allow proper drainage. Make sure that the container has adequate drain holes.
- 5). Drench the soil with a suitable fungicide according to manufacturer's instructions.
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