| Chief Sign or Symptom |
Probable Pest or Disease |
Described Under |
| Upper branches of birch brown, bur- rows in bark. |
Bronze Birch Borer |
Borers |
| Trees in poor vigor after transplant- ing. |
Flatheaded Apple Tree Borer (Fig. 15A) |
Borers |
| Dahlias and other herbaceous plants wilting. |
European Corn Borer Stalk Borer |
Borers |
| Cucurbit vines wilting; white worm in stem. |
Squash Vine Borer |
Borers |
| Bark gnawed off around branches, usually lilac, in late summer. |
Giant Hornet (Fig. 59B) |
Wasps |
| Woody stems with groups of small splinters. |
17-year Locust (Fig. 24) |
Cicadas |
| Stems with parenthesis marks. |
Buffalo Treehopper (Fig. 56B) |
Treehoppers |
Encrustations on barkGray,
oyster-shaped.Thin,
white, on euonymus, bittersweet
, pachysandra.Brown,
hemispherical.
White circles on stems.
White cottony masses
underbrown shell.
|
Oystershell Scale(Fig. 50E)
Euonymus Scale(Fig. 51C)
Tuliptree Scale (Fig.51D)
Peony Scale (Fig.
Cottony-cushion
Scale(Fig. 50C)
Cottony Maple Scale
|
|
| White fluff on pine bark. White fluff on apple branches. |
Pine Bark Aphid (Fig. 5B) Woolly Aphids |
Aphids |
| Frothy masses on stems. |
Spittlebugs (Fig. 56A) |
Spittlebugs |
| White cottony wefts on stems in late summer. |
Lightning Leaf- hoppers |
Mealy Flata |
| Oval, white waxy insects clustered at branch axils on yew, catalpa, on house plants, outdoor plants in South. |
Taxus Mealybug, Comstock Mealy- bug Greenhouse, Citrus Mealybugs (Fig. 36) |
Mealybugs |
GARDEN ENEMIES
