| ENEMY |
DAMAGE |
CONTROL |
| Dahlia (cont.) |
|
|
| Virus - mosaic |
Foliage mottled or with |
Discard diseased plants; |
| and spotted |
ring spots; plants stunted. |
spray with DDT to con- |
| wilt |
|
trol thrips and leafhopper |
| |
|
vectors. |
| Powdery |
White coating on foliage |
Sulfur dust or copper |
| mildew |
in late summer. |
spray. |
| Daylily |
| Flower thrips |
Blossoms streaked, foliage |
Spray or dust with DDT, |
| |
silvery. |
or lindane. |
| Delphinium |
| Cyclamen mite |
Leaves greatly deformed, |
Spray with Dimite, start- |
| |
buds black, plant stunted. |
ing in early spring. |
| Broad mite |
Leaves glassy. |
Sulfur or Dimite. |
| Aphids |
Red lice inside leaves |
Spray with nicotine-soap. |
| |
cupped downward. |
|
| Crown rot |
Plants rot at crown, red- |
Remove plant and sur- |
| |
dish ""mustard-seed"" sclero- |
rounding soil; treat area |
| |
tia and white mycelium. |
with bichloride of mercury. |
| Black spot |
Tarry black spots on leaves. |
Remove infected leaves. |
| Deodar |
| Deodar weevil |
Snout beetle kills leaders. |
Spray with DDT. |
| Dogwood |
| Dogwood bor- |
White grub causes death of |
Spray or paint trunks with |
| der |
limbs. |
DDT. |
| Dogwood twig |
Yellow grub in twigs, |
Cut out infested twigs. |
| borer |
which die. |
|
| Leafhoppers |
Leaves stippled white. |
Spray with DDT in June. |
| Cottony maple |
White cottony fluffs with |
Dormant oil spray or nico- |
| scale |
brown shield on leaves and |
tine-soap in summer. |
| |
twigs. |
|
| Crown canker |
Trunk girdled at base; |
Avoid wounds. |
| |
trees may die. |
|
| Botrytis blight |
Gray mold on old flowers, |
Control measures unneces- |
| |
twigs, in wet weather. |
sary. |
Garden Plants and Their Problems
