Knowledgebase
Palm Tree Inquiry #872851
Asked June 12, 2024, 5:24 PM EDT
Washington County Oregon
Expert Response
Like Florida, we have warm temperatures and many fungal diseases. Chemical treatments are listed here: https://pnwhandbooks.org/plantdisease/host-disease/palm-botrytis-blight
However, other regions have reported several other palm tree problems: https://ucanr.edu/sites/gardenweb/files/29078.pdf
We cannot diagnose whether your plants' problem(s) are fungal, environmental or fertilization (nutrient) by seeing photos. While water may be an issue, not knowing how much they get, and when, and whether drainage is adequate is essential information that we don't know. I suggest that you provide leaf and soil samples to the OSU Plant Clinic for diagnosis: https://bpp.oregonstate.edu/how-submit-plant-materials
Good luck!