Toka Plum (Tree 4) update

Planted in April 2014, this tree was difficult to mow around on account of it being right on the border between the orchard and what was becoming a fire circle / central gathering area.  It became very weed bound.  Clippers were used May / June 2015 to clear away weeds.  The tree is much smaller than its partner Toka Plum (tree #3). The tree actually has more fruit on it than tree 3. I attribute that to the impact of 17 year cicadas and some other insect that creates webs in tree 3.

I have concerns that Brown Rot on the Stanley Plum in the main yard could be carried to the Tokas by Japanese Beetles.