Is there any chance that you have any of the following situations:
1) Walnut trees growing near your pines? Or hickory or pecan?
Any nuts trees nearby?
2) Compost used near your pines and possibly containing
3) Mulch which could contain walnut material?
Walnut poisoning (juglone) via compost and mulch is somewhat rare,
but it can occur. Most often the poisoning occurs as juglone is
released by the root system of the tree, and lateral migration within
and somewhat beyond the tree's root zone carries it to susceptible
What type of pine trees do you have? Some are much more
vulnerable to juglone poisoning than others. If you suspect that
this might be your problem, then you can usually get your local
county extension service or local university to assist you in identifying
your pine trees, the nearby nut trees, and the probability that
juglone poisoning is the cause of your problems. Sometimes a
professor will haul a busload full of eager young students out to
you property for a real-life case study. For free to you.
Your problem is probably not walnut poisoning, but it doesn't hurt
to consider that possibility. It can be something much more simple
such as a neighbor spraying a herbicide near the property line
while you are off at work in the afternoon and some overspray is
drifting to your pines. Or a neighbor intentionally killing the trees
for some nefarious reason. Etc.
PS: Just last quarter I paused near an open door to a small lecture
hall and observed as one of our Ag. Eng. professors was presenting
a case study to a class full of eager upper-class students. Basically,
in the case study, somebody had had great success growing tomato
plants for many years but suddenly his plants were dying after he had
moved the bed about 20 feet from its location from previous years.
Questions from the students slowly painted a difficult quandary: Same
cultural variables, same fertilizer, same tomato varieties and sources,
even the same soil since he had transferred much of his super compost-
enriched soil from the old bed.
As students asked more and more questions, variables were eliminated
and more subtle hints were dropped, but these eager young natural science
& ag. engineering students just weren't catching on. Finally the instructor
pointed to me smiling in the open doorway at the back of the room and
asked if I had a not-too-obvious hint or question. I just said, "any
unfriendly roots in the 'neighborhood'?" and 4 or 5 of the more astute
students quickly shot their arms into the air. They had all heard briefly
about walnut root zones and juglone as freshman, but just these 4 or 5
had retained that vague memory.
Once again, good luck with your problem.
WAYNEL wrote in message
I have (or had) five pine trees (and another 20 as a fence). Two years
ago one of the pine tree's leaves started to go brown and then 6months
later was completly dead (it was around apx 10-12 years old), I then
chopped it down. Then last year the one next to it did the same thing
and yet again it is dead. I have two others next to it but, touch wood
(forgive the pun), they are OK.
An additional fact is that squirals have nexted in them, but squirrals
have been around for years as I live backed on to a park.
The tree up to and at the point of dying look ok. Bark was find not
signs of mold/fungus. However, after one did hugh amounts of scary
looking mushrooms grew.
Can anyone suggest what may be causing this?