Go out early in the morning and just pull the bag worms off. I know of
trees doing well that had bag worms for many years. It is a spruce my
father planted. As far as problems with your trees here is a start.
Remeber they don't like wet feet, the trees you have.


--
Many tree problems are associated with the following: They are Case
Sensitive.

Troubles in the Rhizosphere
http://www.treedictionary.com/DICT2003/shigo/RHIZO.html

Unhealthy Trees from the Nursery / Improper Planting
http://home.ccil.org/~treeman/sub1.html
and
Look up "Tree Planting" http://www.treedictionary.com

Improper Mulching - http://home.ccil.org/~treeman/sub3.html
and
http://www.treedictionary.com/DICT2003/M/ Look up "Mulch"

Improper Pruning
http://www.treedictionary.com/DICT2003/tree_pruning

Improper Fertilization (See A Touch of Chemistry)
http://www.treedictionary.com/DICT2003/shigo/CHEM.html

Tree Farming and Related Problems
http://www.treedictionary.com/DICT2003/SOUND/

Sincerely,
John A. Keslick, Jr.
Arborist
http://home.ccil.org/~treeman
and www.treedictionary.com
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us
that we are not the boss.

"AlanG" wrote in message
. ..

"Paul E. Lehmann" wrote in message
. ..

I have six Arborvitae planted in a row with about
10 feet betteen trees (Central Maryland). They
are about 5 years old and are doing well except
for one tree that developed dried needles on one
side of the tree and rolled up needles similar in
shape and appearance to a cacoon made by
butterflies. There does not appear to be
anything inside, however.

I started spraying the tree with the same thing I
am spraying my vineyard (Dithane, Sulphur,
Penncop, and Seven). The condition has not
gotten worse and possibly it is showing some
signs of recovery.

Any idea on what this condition is due to?

Sounds like bagworms...
http://tinyurl.com/yr39m8