Galls are actually tumors caused by a bacterium in the soil that can infect the plant if the plant has been damaged in some way (cuts from hoeing, transplanting, etc). It can also spread from plant to plant by not sterilizing pruning equipment. The bacterium that causes this condition will live in the soil for years. It often doesn't bother the overall look of the plant, but it can cause less bloom or stunt the plant slightly. There's really not much you can do about this, once it's in your soil. It probably happened when the roses were moved from your neighbor's house. Also, keep in mind that many older varieties of roses do drop their petals quickly and don't bloom well. The problem with the flowering could not even be related to the galls at all. You can leave the roses as they are and keep them as happy as possible or remove them and grow something else there. Do not plant roses in this location because the bacterium is still in the soil, but it should not hurt other plants. And, always sterilize your pruning shears if you cut or prune your infected plants before you use them on another rose. I bet this happened when the roses were transplanted."