You can notice this disease forming on your palm trees by seeing a spongy, “whitish mushroom-like growth which grows to form a horizontal disc extending out from the bark”. These funguses are usually at the bottom of the tree. Unfortunately, the tree needs to be removed. Do not chip this section and use for mulch. The diseased section should be placed in a legal landfill or incinerated
Don’t let this disease spread throughout your property so please inspect your trees yourself or have a professional landscaper do it for you. If there are any signs, remove the palm immediately.
Other than seeing the growth at the bottom of the tree, there is no way to predict or determine which palms will be or are currently infected. Unfortunately, due to these facts, there is no way to use fungicides to control the disease. Therefore, there are no fungicide recommendations for this disease.