I planted two pygmy date palms by my pool over a year ago. For the most part, they have been doing very well up until a couple months ago. The fronds on one of the trunks started turning brown quickly and dying off to the point I removed the last few. I added a balanced liquid palm fertilizer but to no avail. The top of the trunk where the new fronds come out seems very damp/wet and I'm wondering if I have trunk rot or some kind of fungal infection. Any ideas on how I can save this palm?? Thank you!