Names link to more information on identification and
management.
Click on photos to enlarge
Armillaria root rot (oak root fungus) Identification tip: White mycelial mats are evident
at or below ground in trees infected with Armillaria.
Crown gall Identification tip: Crown gall disease results in rough,
abnormal galls on roots or trunk. The undifferentiated tissue
of a crown gall is soft and spongy.
Phytophthora root and crown rot Identification tip: If you peel away the bark, the underlying
wood of a Phytophthora canker is a dark, reddish brown.
Dying
leaves and branches in a tree can be caused by crown
gall, phytophthora root rot, and armillaria root rot.
Redhumped caterpillar Identification tip: The redhumped caterpillar has
a striking appearance. The main body color is yellow and
is marked by longitudinal reddish and white stripes; the
head is bright red, and the fourth abdominal segment is red
and enlarged.
Tree borers become secondary
pests when they invade trees damaged by one of the pests
above.
Pacific flatheaded borer Identification tip: The Pacific flatheaded
borer leaves an oval hole in the bark surface upon emerging.
Peachtree borer Identification tip: Look for frass at the base of
the tree (frass above pupa in photo above).
Shothole borer Identification tip: Look for emergence holes in
the bark.
