They are known as water sprouts; usually with larger than normal leaves and maybe larger thorns; they are often a sign that you are being overly kind with food. As you can see from the photo, the CLM has attacked this branch most because it is the sweetest, tenderest growth. Just prune it back to the level of the general canopy and it will revert to normal growth.
BTW, I think this was answered on the CLM thread.

Thanks Johnmerr, I couldn't find the thread anywhere, even tried the search function on this site. I'll go look there,just incase. I'm feeding about a cup(ish) of fertilizer 3 times between spring and winter, no food during winter. These trees have been planted for two years, not sure total age of the trees.