What factors apart from acid rain could be killing trees?

Question

What factors apart from acid rain could be killing trees?

Answer 1

mites, drought, ash borers, etc.

Answer 2

insects ;)

Answer 3

There are many things that could be killing trees:

~herbicides

~fungal pathogens (rusts, blights, etc.)

~parasitic plants (mistletoe, Spanish moss)

~bacterial pathogens

~insects

~viral pathogens introduced by insects

~animals (girdling, eating foliage, chewing on roots, etc.)

~humans damaging the tree

~growing in the wrong conditions (complete shade, wrong climate, wrong soil type, etc.)

~drought

Answer 4

bacteria, molds, fungus, mites, insects, fire, drought, industry etc...

Answer 5

YOU!

Answer 6

Acid rain? That went out in the 70's. But there are a lot diseases that could kill them. Google a tree Doctor.

Answer 7

Tree huggers squeezing too tight?  Just kidding, another culprit is beetle kill and other diseases that prey on trees.