My neighbors palm tree is located next to my driveway where we park our cars. For many years ,About 2 or 3 times a year the tree seems to drop a mist of sappy substance that sprays all over our cars. It seems to be water solvable because it does come off at the car wash. How do I get my neighbor to spray the tree to stop the sap from falling or is there nothing that can be done??
There is nothing short of hacking the palm down. You could easily cover your cars with a light, inexpensive fabric to catch the 'honey dew'. Please send pictures. Legally there is nothing at all you can do...make nice with the neighbors. They aren't having the problems you are having so the only recourse to entice them is to have another species of tree not so amenable to aphids and other sap sucking insects that are pooping on your driveway...costly.