| AFFECTING NEEDLES: |
|
CONDITION |
CAUSE |
 |
Frothy
masses on needles |
Juniper spittlebug (Clastoptera
juniperina Bell).
|
|
Honeydew
present |
Giant conifer aphids (Cinara
spp.)
|
|
Needles
chewed and fragments tied with webbing |
Juniper webworm (Dichomeris
marginella)
|
|
Aphids
on needles |
Giant conifer aphids (Cinara
spp.)
|
|
Pale
green or yellow needles |
Iron chlorosis
|
|
Needles tips
bleached or brown |
Winter dessication or
Vole injury
|
|
Needles
become grayish, with small flecks |
Spruce spider mite (Oligonychus
ununguis)
|
|
Scales
on needles |
Juniper scale (Carulaspis
juniperi Bouche) or Fletcher
scale (Parthenolecanium fletcheri)
|
|
| AFFECTING TWIGS AND SMALLER BRANCHES: |
|
CONDITION |
CAUSE |
|
Twig
galls |
Juniper rusts (Gymnosporangium
spp.)
|
|
Twig
dieback |
Grasshoppers
(Melanoplus spp.)
- Phytophthera Root or Crown Rot
|
|
Large
aphids on branches, twigs |
Giant conifer aphids
((i>Cinara spp.)
|
|
Brown
felt-like material on needles and branches (higher elevations only) |
Brown felt blight (Herpotricha
juniperi)
|
|
| AFFECTING LARGER BRANCHES OR TRUNK: |
|
CONDITION |
CAUSE |
|
Witches’
brooms or branch galls |
Juniper broom rust (Gymnosporangium
speciosum)
|
|
Large
aphids on branches, trunk |
Giant conifer aphids (Cinara
spp.)
|
|
| AFFECTING ROOTS AND GROUND LINE AREA: |
|
CONDITION |
CAUSE |
|
White
root decay with white mycelial fans between bark and wood |
Armillaria root
disease (Armillaria mellea)
|
|
Brown, discolored roots |
Phytophthera Root or Crown Rot
|
