>>2445556Trees often have lots of different parasites, the vast majority of them causes no harm whatsoever other than maybe making growth a little slower.
Just look inside the crown of an oak tree, you'll find galls, fungi, mistletoe, caterpillars, leafminers - all sorts of stuff that constantly saps fluids from it. The trees have been dealing with this for millennia and are perfectly equipped to keep thriving while being consumed.
Parasites that actually kill trees are relatively scarce, and are usually species than man imported from one side of the globe to the other.
