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GARDEN ENEMIES |
Hyperplastic, or overdevelopment, symptoms are galls, tumor-like swell
ings; curl or blister, coming from excessive growth in portions of leaves;
and scab, a raised lesion.
Signs are evidences of disease or injury produced by the plant enemy
itself-fungus fruiting bodies or mycelium, insects, or their eggs, cast
skins, or excrement. The following pages provide a quick guide for the
determination of types of garden enemies according to signs and symp-
toms (the patterns) on the various plant parts-root and crown, stem,
foliage, bud and flower, and fruits. It gives you a start on your detective
work, and you can check your guess in Chapter II where types of garden
enemies are described in alphabetical order, with diagnostic sketches, and
a few specific examples. Chapter III, with a tabulation of some of the
more common enemies under the different host plants, provides a further
check on your diagnosis.
The emphasis in this book is purposely on recognition of pests rather
than on control. If you can answer the question, "What is it?" then the
question, "What do I do about it?" can be answered from many sources.
Chapter IV gives a list of chemicals presently available, and suggestions
for use are given in the discussion of each pest, but to keep up to date you
must rely on current garden magazines and garden pages in newspapers.
The chemical picture changes from week to week; the biological patterns
remain the same.
| Chief Sign or Symptom |
Probable Pest or Disease |
Described Under |
| Rough, roundish bump at crown or on larger roots. |
Crown Gall (Fig. 30B) |
Galls |
| Small, nodular swellings in roots. |
Root Knot (Fig. 41A) |
Nematodes |
| Roots swollen into ""fingers."" |
Club Root |
Club Root |
| Roots eaten back from tip, witches' broom effect on boxwood. |
Meadow Nema- todes |
Nematodes |
| Roots of yew, other evergreens, eaten off by small white grubs. |
Black Vine Weevil (Fig. 63B) Straw- berry Root Weevil |
Weevils |
| Roots riddled by maggots; seedlings wilt. Rusty tunnels in root. |
Onion, Cabbage Maggot (Fig. 35) Carrot Rust Fly |
Maggots |
| Small, white or gray lice on roots, bulbs. |
Root Aphids |
Aphids |
| Soil loose and granular, or in mounds. |
Ant Nest |
Ants |
| Summer mounds in lawn; large wasps. |
Digger Wasps (Fig. 59A) |
Wasps |
| Small tunnels in soil, in South. |
Mole Crickets (Fig. 25) |
Crickets |
| Large tunnels with ridges in lawns or garden beds. |
Moles |
Mammals |
| Grass brown, roots eaten by large white grubs. |
Larvae of May or June Beetles (Fig. 7B) |
Beetles |
| Grass brown, can be rolled back like a carpet, smaller white grubs. |
Larvae of Japanese or Asiatic Beetles (Fig. 7A) |
Beetles |
| Grass brown in patches, cannot be rolled back, minute black and white bugs. |
Chinch Bugs (Fig16)" |
Bugs |
| Seedlings dying soon after germina- tion. |
Damping-off |
Damping-off |
| Plants rotting at crown; reddish sclerotia, white mycelium at base. |
Crown Rot, Southern Blight (Fig. 44C) |
Rots |
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