| Chief Sign or Symptom |
Probable Pest or Disease |
Described Under |
| Leaves with silvery streaks, black |
Gladiolus Thrips |
Thrips |
| dots of excrement. |
(Fig- 57) |
|
| |
Onion Thrips |
|
| Leaves yellow, perhaps darker |
Lack of iron |
Chlorosis |
| veins. |
| Leaves mottled green. |
Mosaic |
Virus Diseases |
| Leaves yellowed, streaked, or |
Yellows, Spotted |
|
| spotted. |
Wilt |
|
| Leaves deformed |
| Thick, abnormal shape, blackened. |
Cyclamen Mite (Fig. |
Mites |
| |
39A) |
|
| Glassy. |
Broad Mite |
|
| Abnormal shape, thick or fern- |
2,4-D Injury |
Weedkillers |
| like, curled, twisted petioles. |
(Fig. 62) |
|
| Leaves curled and blistered. |
Peach Leaf Curl |
Leaf Blister |
| |
Oak Leaf Blister |
|
| Young leaves of snowball tightly |
Snowball Aphid |
Aphids |
| curled. |
(Fig. 5A) |
|
| Leaves curled around white |
Woolly Aphids |
|
| streamers. |
| Leaves puckered or cupped down- |
Currant, Melon |
|
| ward with lice in pockets on |
Aphids |
|
| underside. |
Goldenglow Aphid |
|
| |
(on delphinium) |
|
| Leaf enlarged into a gall. |
Azalea, Camellia |
Galls |
| |
Leaf Gall (Fig. |
|
| |
30A) |
|
| Spruce needles enlarged at base to |
Eastern, Cooley |
Aphids |
| form gall with stem. |
Spruce Gall Aphids |
|
| Juniper needles enlarged into gall, |
Cedar-apple Rust |
Rusts |
| orange horns in spring. |
| Small, conical galls on chrysan- |
Chrysanthemum Gall |
Midges |
| themum. |
Midge (Fig. 37C) |
|
| Galls on oak leaves. |
Gall Wasps |
Wasps |
| Cockscomb galls on elm. |
Elm Cockscomb Gall |
Aphids |
| |
Aphid |
|
GARDEN ENEMIES
