I don't know about satsumas but that last fruit pictured looks like all my peaches on all my trees every year now for 6 years. They will be cut down this July if they fail to produce goo fruit. Do you get to much rain that time of the year. You may want to try something that can handle that much rain.

peaches are a walking disease, you have to spray copper when dormant

bklyn I am a no spry person. I grow peach tree curl varieties an I hand kill my peach tree borer as the eggs hatch up until there grub life cycle would end. My yard is in the corner of a deep ravine and stays very humid all day. My out of area 3 peach trees produce over 5 bushels of fruit. I can't grow peaches or grapes in my yard.

Steve

So many things working against us, and yet we still try to prevail. What a shame there is such diseases out there. I have to spray for powdery mildew every year or most of my plants would be toast( That includes, honeysuckle, azalea, grape leaves, peaches, roses, tomato's and so on.