Over the last year I’ve noticed a significant number of Douglas Fir trees (Pseudotsuga menziesii) declining rapidly in my neighborhood. They are showing signs of apical dieback, which rapidly progresses from the tip of the tree downward. All of the trees that I am noticing are

On private property so I can’t easily access the roots, [...]

Today I attended a lecture with internationally renowned plant pathologist Olaf Ribeiro. And, boy did I learn a lot. Mainly I learned that my strong belief in continuing education means that I attend lectures like this in order to learn how much I really don’t know.
Okay, so I do know a few things about plants [...]