This
site contains links to information on tree diseases including insect
(bark beetle and other) and non-infectious diseases. For
your convenience, each site has been unofficially rated for content,
ease of use, and pictorial information (* poor; ***** very good) http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7421.html
Wonderful information
on the bark beetle. Great pictures! A must-read site
for any conifer
owner! ***** http://www.for.gov.bc.ca/tasb/legsregs/fpc/fpcguide/beetle/betletoc.htm
Really good information
on bark beetles and control. A must read. ***** http://willow.ncfes.umn.edu/ht_non/non_all.htm
Information on non-infections
disease (ex: weather related, genetic, etc) in
many types of trees, and solutions.
Really good pictures. *** | 
