I have an old pear tree that is probably at least seventy years old. We pruned it acouple of years ago and it is just loaded with pears this year. It had about a fifty five gallon drum full of pears. We canned and froze a punch. I saved some seeds to plant, but read that this would probably not be a good idea, that pears where unpredictable. It said that it was better to graft limbs on to another root stock. Was wondering when was the best time to give this a try? I would hate to lose this type of pear. The tree is hollow inside and had vines growing out of the top of it so I know that its years are numbered and doubt if you would be able to find another. I have four other pear trees that are about five years old and continue to get the blight and have limbs to die. I am thinking of cutting them down. Is there something I can get to spray them with? Nothing seems to bother this old tree.