Gladiola
Symptom Cause  
Leaves wrinkled or curled; discolored, stunted, tend to fall off
Aphids
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Thin, weak, yellow leaves; flower spikes twisted/distorted; plant small, spindly
Aster Yellows
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Water soaked spots on corms
Corm Scab
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Young plant cut off at soil
Cutworms
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Foliage yellows, dies; leaf bases rotted; dark brown lesions on corms
Dry Rot
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Plants wilt; stem, leaf discoloration; plant dies
Fusarium Wilt
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Foliage, flower spikes stunted; flowers small, faded; yellowing at leaf tips
Fusarium Wilt
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Dark mold on leaves and stem
Gray Mold (Botrytis Blight)
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Foliage distorted; corms decayed
Mite
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Foliage mottled, streaked; foliage stunted;
Mosaic Viruses
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Plants stunted; yellowed; root lesions
Nematodes
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Corky, reddish-brown lesions on corms, rotted area has blue-green mold; corms may not produce foliage
Penicillium Corm Rot
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Bulbs eaten, plant pulled underground
Pocket Gophers
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Corms gnawed; unearthed or eaten
Rodent Injury
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Black powdery sooty mold fungus forms on honeydew; plants may die
Sooty Mold
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Bulbs eaten, plant pulled out of ground
Squirrels
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Buds brown, die; silvery white streaks on leaves; flowers streaked, distorted
Thrips
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