We have had some peach trees for about 18 years now. One had a kanker from the begining. We treated it with a fungus powder each winter for three years. It has always produced the most, and best peaches until three years ago. Just before they ripened they shrivelled and became gray/green and fell off the tree. We were unable to do anything then, but I am sure that is why the problem has spread. The other trees continued to do well, and produce. It did it again last year, and this year the other trees did the same. Is there any hope to save the fruit? Are the trees in danger? What can we do?