I have a redbud tree, two years planted next to my drive, where my light colored car is parked. I have little pin head size black spots on the side the tree is planted, on the hood, top and truck, no spots on opposite side of tree. I had this problem about a month ago and thought it was road tar splatter. I have not driven my car in several weeks and it has the little black spots on it and they have more each day. Washing will not remove them, only wax and then the stain it leaves has to be rubbed out. Is this a insect and should it be sprayed? I am sure the spots are not from driving, but from the tree. We had a redbud tree in the same spot for years before it died, so we are at a loss on what we should do. Thank you.

The Redbud is likely hosting some aphids on the underside of the leaves. Aphids are sap feeding insects and once the fluid is digested, it is expelled as droplets of a sugary exudate. The material then attracts what is known as "Sooty Mold" which grows on the droplets you see. If this is continuing, you can use any properly labeled insecticide to control the aphids, remembering that they are on the underside of the leaves and your spray must be directed accordingly. Alternatively if you do wish to spray, a very strong stream of water can dislodge the insects or you could consider a car cover to prevent the droplets from reaching the cars paint.