Foxtailpalm prefers well-drained, sandy soil and fairly dry conditions. Rot is more likely to occur when weather conditions are continually cold and damp. Leaf blight. This fungal disease begins... Ask your local palm or gardening expert for the best fertilizers for your plant and garden. A healthy and well-balanced soil will increase your Foxtail's defences against common palmdiseases. Other Diseases Affecting FoxtailPalms. Foxtailpalms are susceptible to iron and potassium deficiencies that make them at risk for disease. Menu Menu. FoxtailPalm. Location. General Plants.Pests/Diseases: resistant to most insects and diseases but are vulnerable to various fungal diseases triggered by over-watering. Foxtails are susceptible to cold damage anywhere close to freezing, especially with frost. Anywhere in the 30s could cause some leaf spotting that's mostly cosmetic. Below are common symptoms of foxtailpalmdiseases and how to manage them.Crown rot and root rot. Spray the infected foxtailpalm with the diluted copper fungicide covering the entire tree including the underside of the leaves. Repeat the treatment at seven to 10 day intervals as needed. FoxtailPalmDiseases – How To Treat DiseasedFoxtailPalm Trees. If you’re pondering the question, “Is my foxtailpalm sick,” then you’ve come to the right place. Discover how to care for the foxtailpalm Wodyetia bifurcata: watering, lighting, pruning, and tips to show off your exotic garden. Learn all its secrets here. Thriving in USDA zones 10-11, FoxtailPalms prefer a sunny location with well-draining soil. Start your Foxtail journey with a healthy, disease-free specimen, ideally one to two feet tall.