| Chief Sign or Symptom |
Probable Pest or Disease |
Described Under |
| Webbed nests at branch crotches. |
Tent Caterpillar (Fig. 22A)" |
Caterpillars |
| Branches webbed together at end. |
Fall Web worm (Fig. 61) |
Webworms |
| Brackets coming out of trunk. |
Heart Rot Fungi |
Rots |
| Bark with swollen blisters, pine. |
White Pine Blister Rust |
Rusts |
| Pine shoots tan, crooked. |
European Pine Shoot Moth (Fig. 40A) |
Moths |
| Galls at base Norway spruce twigs. Terminal gall on blue spruce. |
Eastern Spruce Gall Aphid (Fig. 4A, B) Cooley Spruce Gall Aphid (Fig. 4C) |
Aphids |
| Canker at base of trunk, maple, dog- wood, etc. |
Bleeding Canker, Crown Canker |
Cankers |
| Dark sooty areas near wounds. |
Rose Stem Canker |
Cankers |
| Small white spots, reddish margins on rose canes. |
Brown Canker (Fig. 21A) |
Cankers |
| Shoots, branches dying, pear, apple, etc. |
Fire Blight (Fig. 14) |
Blights |
| Peony shoots dying, gray mold. |
Botrytis Blight (Fig. 13A) |
Blights |
| White coating on stems, shoots. |
Mildew |
Powdery Mildews |
| Reddish or black pustules on stems, shoots. |
Rust |
Rusts |
| Orange tendrils entwining stems. |
Dodder (Fig. 28) |
Dodder |
FOLIAGE PROBLEMS
|
| Chief Sign or Symptom |
Probable Pest or Disease |
Described Under |
| Leaves eaten through or skeletonized Entirely ravaged. |
Grasshoppers |
Grasshoppers |
| Eaten by large worms with poste- rior horn. |
Tomato, Tobacco Horn worm (Fig. 23) |
Grasshoppers |
GARDEN ENEMIES
