| AFFECTING WHOLE PLANT: |
|
CONDITION |
CAUSE |
 |
Tree
decline in vigor |
Phytophthora
root rot (Phytophthora spp.), Cytospora Canker (Valsa
spp., Leucostoma spp.), or
Verticillium
wilt (Verticillium spp.)
|
|
| AFFECTING LEAVES: |
|
CONDITION |
CAUSE |
|
Leaves
chewed, no associated webbing |
Pearslug
(Caliroa derasi)
|
|
Upper
surface of the leaf skeletonized |
Pearslug (Caliroa
cerais) or Apple Thorn Skeletonizer
|
|
Webbing
associated with chewing |
Fall webworm (Hyphantria
cunea Drury), Ugly
Nest caterpillar (Archips cerasivorana), or
Western
tent caterpillar (Malacosoma californicum)
|
|
Leaves
with small, circular holes |
Shot hole disease
|
|
White
flecking injuries |
White apple leafhopper (Typhlocyba
pomaria McAtee) or
Lacebug (Corythuca padi), on chokecherry (Corythuca spp.)
|
|
White
powdery material on upper or lower surface of leaf |
Powdery mildew
|
|
Leaves
yellow |
Iron chlorosis or
X-disease
|
|
Leaves
with small, pouch or finger-like projections |
Fingergall mites (Phytoptus
species)
|
|
New
leaves curled |
Aphids: Green peach aphid (Myzus
persicae), Leafcurl plum aphid (Anuraphis helichrysi), or
Black cherry aphid (Myzus cerasi)
|
|
New
leaves curled and thickened and red/purple |
Peach leaf-curl
disease
|
|
| AFFECTING LARGER BRANCHES OR TRUNK: |
|
CONDITION |
CAUSE |
|
Black
galls on branches |
Black knot of cherry (Apiosporina
morbosa)
|
|
Stem
decay and/or hoof-shaped fruiting body (conk) |
Decay fungus (Phellinus
pomaceus)
|
|
Scales |
Scale: European fruit lecanium
(Parthenolecanium corni) or Oystershell scale (Lepidosaphes
ulmi)
|
|
Small
pinhead-sized exit holes in branches |
Shothole borer (Scolytus
rugulosus)
|
|
Branches
die back |
Cytospora canker (Valsa
spp., Leucostoma spp.) or Shothole borer (Scolytus rugulosus)
|
|
Gumming
and dark colored branches |
Shothole borer (Scolytus rugulosus), or Cytospora canker (Valsa
spp., Leucostoma spp.) or
- Bacterial Blight (Pseudomonas syringae)
|
|
Dead
bark with discoloration and small pimple-like fruiting bodies (pycnidia) |
Cytospora canker (Valsa
spp., Leucostoma spp.)
|
|
Wilting
and dieback of portions of tree, originating from roots |
Verticillium wilt (Verticillium
spp.)
|
|
| AFFECTING GROUND LINE AREA OF TRUNK: |
|
CONDITION |
CAUSE |
|
Discolored
tissue under bark at ground line |
Phytophthora
root rot (Phytopthora sp.)
|
|
Gall at
ground line |
Crown gall (Agrobacterium
tumefaciens)
|
|
| AFFECTING FRUIT: |
|
CONDITION |
CAUSE |
|
Fruit
tunneled |
European earwig (Forficula
auricularia L.) |
|
Fruit
with sunken, corky areas |
Plant bug (Lygus
species), Hail injury, or Boxelder
bug (Boisea trivittata) |
|
Puncture
wounds in fruit |
Bird damage (Robins,
finches, etc.) |
|
Chokecherry fruit enlarged, hollow. |
Chokecherry gall midge (Contarinia virginianae) |
|
Maggots in cherry fruit |
Western cherry fruit fly (Rhagoletis indifferens Curran |
