| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Leaves
chewed |
Redhumped
caterpillar (Schizura concinna)
|
|
New
leaves curled |
Sunflower aphid (Aphis
helianthi)
|
|
Black
spots on leaves |
Septoria leaf spot and
canker (Septoria cornicola)
|
|
White
powdery material on upper or lower surface of leaf |
Powdery mildew
|
|
| AFFECTING TWIGS AND SMALLER BRANCHES: |
|
CONDITION
|
CAUSE
|
|
Scales |
Oystershell scale (Lepidosaphes
ulmi)
|
|
Dead
areas on stem |
Nectria canker (Nectria
sp.) or
Root collar rot (Phytophthora sp.)
|
|
| AFFECTING FRUIT: |
|
CONDITION
|
CAUSE
|
|
Feeding
in or on berries |
Conifer seed bugs (Leptoglossus
occidentalis)
|
