Do I need to be concerned over the root system since I've removed the tree at near ground level? I noticed yesterday morning the few very small growths I'd seen had become massive over most of my plum tree, some rather large. Once I found out what it was I had no problem starting my saw (ok, simple process, it's electric). Learning my tree had Black Knot and it could affect my cherry trees I was quick to remove the plum. I cut her down and all is removed to the county land fill.
Fact is I'd considered removing the tree previously due to the dangers to my dogs -- one of them, Buddy, eats the fruit & seed. By shear accident I matched his systems to the cyanide found within plum trees. And, the fallen fruit created a gosh-awful wide spreading spell (it's nearly impossible to keep clean under a plum tree). So, the poor Plum was destined to go, sick or healthy although I did enjoy the sweet fruit.
Anyway, I had put out this tree along with a Bing cherry several years ago and it wasn't until last summer I found a mate for the cherry tree. I'm now looking forward to cherries for me and the birds. But, now I'm concerned the Black Knot fungus from the Plum tree may hit both the older and newer cherry trees. I'll keep watch in order to prune areas out but is there more I can/should do?