Your rootstock is poncirus trifoliata and it is what has taken over and produces the fruits. Just trim it back and let the original stems grow back. Keep the lower rootstock suckers from growing.

Trim any branch with 3 leaflet leaves and keep any limb with single leaves. Same with the lemon if it has any live branches with single leaf leaves

This post was edited by poncirusguy on Sun, Sep 28, 14 at 21:51

Post 2 pictures. One of the tree branching at the soil line and another of the tree in general. I bet we can tell what to cut.

I have lots of pics but don't think it allows me to d/l more than one that I have to resize...Thanks for all of your info..I had no idea that there were THREE full size trunks and so, I did not know what to do. This is the picture of the satsuma...I see the hump described to me and only the largest trunk has the three leaves, on which 2 satsumas produced this year. We looked for anything BELOW that hump on either tree to cut off, but can't be sure what we are doing. I guess my understanding is that those full size trunks that seem to be at or below the hump should be cut off?? We cut one but not at ground level. If the three leaves are the key, then the (humped) trunk only should be left standing?

Hi ..regarding the pics of satsuma tree..I uploaded 3 to a link..if this helps..need to find pics of entire trees..THANKS!!!!!!!!!!!!!

Here is a link that might be useful: satsumas

From the photo above, the trunk to the right is your satsuma. You can clearly see the graft line. The other two trunks are probably rootstock shoots that were left to grow. It is overtaking your grafted tree. Simply trace back your trifoliate leaf branches to the trunk that bears them, and cut those trunks down to the ground, preferably under the ground. You will have to monitor for more rootstock suckers that pop up, as they will surely spring back up, since you've allowed those suckers to become very, very established.

Patty S.