I have a couple Phoenix Sylvestris palms and think, they are the most attractive palms around. The only problem owning them is the chance of lethal bronzing( IBD). I am clearly against injecting any antibiotic into the trunk fearing the hole left in the trunk even though it can be plugged. My plan of attack of this disease is to attack the leafhopper from landing on my palms in the first place and why I spray a combination of insecticides including neom oil every two months on my froms. More often during rainy seasons. I also drench my Palms with an antibiotic every 5 months. So far my trees are doing fantastic and I hope to keep it that way. 

@Gill Welcome to PalmTalk!  Hopefully this process works for you.  There used to be a lot more Phoenix species around before Lethal Bronzing showed up.  My city alone has lost thousands of them.  Keep us updated!

Any defensive method is better than nothing at all! It’s all about control, with insects you will never really beat them but you can control them. As soon as you turn your back on them they strike with a vengeance. 

Winter approaching and Palms are going to be freezing to death; What do you do? If you love Palms as I do, you will try to save their lives so, you get out your old incandescent Christmas lights and wrap those warm bulbs around your palms and esp. around the heart of the palm, the crown where life starts then, you tape a sheet around the trunk, covering the light bulbs and tape the sheet together and then, wrap around a blanket ( I use moving pads that I have) over the sheet and tape it and finally, give your palm or palms a warm night by turning the lights on. Believe me, your Palms will thank you with beauty.