名媛直播

Hi, I repotted a calamondin orange tree and gave it a trim. It suffered leaf drop after which I guess is pretty normal after repotting.

But some of the branches that I cut back are going brown from the ends and creeping towards centre of the tree. Is disease entering the branches from the cut? Should I use sterilised tools? Is there some special treatment to put on the ends of cut branches to stop this happening?

Thanks for any advice.

Please show a picture.
I doubt it is disease but one never knows.