| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Leaves
being chewed |
Fruittree leafroller (Archips
argyrospila) or Spiny elm caterpillar, usually in masses (Nymphalis
antiopa)
|
|
Leaves
with white flecking (net-leaf hackberry) |
Lacebugs (Corythucha
spp.)
|
|
Leaves
yellowed |
Iron chlorosis or
other deficiency, or Root damage from under or over watering
|
|
Leaves
with large, conspicuous raised areas |
Hackberry nipplegall
maker (Pachypsylla celtidismamma)
|
|
Leaves
with small raised areas |
Hackberry blistergall
maker (Pachypsylla celtidivescula Riley)
|
|
| AFFECTING TWIGS AND SMALLER BRANCHES: |
|
CONDITION
|
CAUSE
|
|
Cellophane-like
webbing in late summer |
Spider mites (Tetranychidae
spp.)
|
|
Twigs
deformed into dense witches’ broom |
Eriophyid mites / Powdery mildew complex
|
|
| AFFECTING LARGER BRANCHES OR TRUNK: |
|
CONDITION
|
CAUSE
|
|
Borers /
Bark beetles |
Flatheaded appletree
borer (Chrysobothris femorata)
|
|
Clear to
white oozing or frothy maladorous liquid exiting from wounds |
Bacterial wetwood /
Slime flux
|
