I have a weeping cherry on my front lawn in Pelham, NY that looks maybe 20 years old, and it's in rough shape. It has about 50% less leaves this year. The lower part of the trunk, before the upper grafting, is about 4 feet tall, and 13" diameter. There's a bald spot near the ground where the bark is gone, and directly above that for most of the height of the trunk are splits and cracks in the bark. I can see in there and I noticed what almost looks like barnacles, little white things, maybe cocoons? Also there's a bit of blackish sap oozing out of opposite side of the trunk. Is there help?
Thanks so much - Nick
Twenty years is a long time for a weeping cherry. I think it is showing its age. You can try to fix all those problems but clearly the tree is deeply stressed and weakened. A weak or stressed tree will invite pests and it will not be long before it is overcome no matter what you do. I would begin looking for a replacement.