| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Leaves
chewed |
Snailcase bagworm (Apterona
helix)
|
|
White
powdery material on upper or lower surface of leaf |
Powdery mildew
|
|
Orange
pustules on leaf |
Leaf rust
|
|
| AFFECTING TWIGS AND SMALLER BRANCHES: |
|
CONDITION
|
CAUSE
|
|
Frothy
mass on stems |
Spittlebug (Clastoptera
spp.)
|
|
Cottony
balls on stems |
Rabbitbrush gall
flies (Aciurina bigeloviae)
|
|
Green
flowerlike swellings |
Rabbitbrush gall
flies (Aciurina bigeloviae)
|
