Geranium, Hardy
Symptom Cause  
Leaves curl/discolored; honeydew on undersides of leaves, sooty mold forms
Aphids
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Dark spots on leaves show yellow edges
Bacterial Spot
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Small holes in unopened buds
Budworm
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Plants chewed to ground level
Deer
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White powder on leaf undersides; foliage wilts
Downy Mildew
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Foliage wilts; shows dark spots
Four Lined Plant Bug
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Flower clusters covered with gray mold
Gray Mold (Botrytis Blight)
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Cottony white masses on roots, stems, branches leaves; reduced plant vigor
Mealybugs
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Yellow green mottling of leaves.
Mosaic Viruses
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Brownish-orange spots on foliage; stems
Rust (on plants)
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Ragged holes chewed in middle of leaves
Slugs and Snails
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Leaves stippled; covered with webs
Spider Mites
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Yellowing of foliage, gradual defoliation, plants may become stunted
Verticillium Wilt
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Weakened plant, leaves yellowed, flying dandruff when foliage disturbed
Whiteflies
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