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Ornamental Plant Diseases
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Flashcards
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Black Spot
Affected Plant Species: Roses. Treatment: Apply fungicides like chlorothalonil or mancozeb, prune affected leaves, ensure proper watering habits.
Dutch Elm Disease
Affected Plant Species: Elm Trees. Treatment: Prune diseased limbs, break root grafts, inject trees with fungicides like propiconazole.
Boxwood Blight
Affected Plant Species: Boxwood (Buxus spp.). Treatment: Apply fungicides like chlorothalonil, improve air circulation through pruning, avoid overhead watering.
Oak Wilt
Affected Plant Species: Oak Trees, particularly Red Oaks. Treatment: Isolate affected trees by trenching, inject with fungicides like propiconazole, remove and destroy infected trees.
Powdery Mildew
Affected Plant Species: Roses, Lilacs, and Phlox. Treatment: Apply fungicides or sulfur sprays, increase air circulation, and remove infected parts.
Downy Mildew
Affected Plant Species: Impatiens, Grapevines, and Basil. Treatment: Improve air circulation, reduce leaf wetness, apply fungicides like mefenoxam or fosetyl-al.
Sooty Mold
Affected Plant Species: Many ornamental plants with honeydew-producing insects. Treatment: Control sap-sucking insects, wash plants with water, apply horticultural oils or insecticidal soaps.
Bacterial Leaf Spot
Affected Plant Species: Pepper, Tomato, and Begonia. Treatment: Apply copper-based bactericides, avoid overhead watering, and use disease-free seedlings.
Southern Blight
Affected Plant Species: Many ornamentals including Hydrangea and Iris. Treatment: Remove infected plants and soil, apply fungicides like thiophanate-methyl, avoid heavy mulching.
Bacterial Soft Rot
Affected Plant Species: Calla Lilies, Orchids, and many bulbous plants. Treatment: Avoid over-watering, improve air circulation, dispose of infected plants.
Apple Scab
Affected Plant Species: Apple and Crabapple Trees. Treatment: Apply fungicides during early spring, practice good sanitation, plant resistant cultivars.
Cedar Apple Rust
Affected Plant Species: Juniperus spp. and Malus spp. Treatment: Remove alternate host plants, apply fungicides like myclobutanil or triadimefon, plant resistant varieties.
Botrytis Blight
Affected Plant Species: Peonies, Geraniums, and Begonias. Treatment: Remove affected plant parts, improve air circulation, and apply fungicides like chlorothalonil or iprodione.
Witch's Broom
Affected Plant Species: Many woody ornamentals including Hackberry and Cherry. Treatment: Prune abnormal growths, apply miticides if caused by mites, ensure plant vigor through proper care.
Leaf Spot Disease
Affected Plant Species: African Violets, Hydrangeas, and Asters. Treatment: Remove and destroy infected leaves, apply appropriate fungicides, improve air circulation.
Rust
Affected Plant Species: Daylilies, Hollyhocks, and Snapdragons. Treatment: Apply fungicides containing myclobutanil or tebuconazole, remove infected parts, avoid overhead watering.
Fusarium Wilt
Affected Plant Species: Palms, Tomatoes, and Carnations. Treatment: Remove and destroy infected plants, use clean soil, plant resistant varieties when available.
Crown Gall
Affected Plant Species: Euonymus, Rosa spp., and Prunus spp. Treatment: Remove and dispose of infected plants, avoid wounding plants, use biological control agents like Agrobacterium radiobacter strain K1026.
Phytophthora Root Rot
Affected Plant Species: Rhododendrons, Azaleas, and Fraser Fir. Treatment: Provide good drainage, apply fungicides like mefenoxam, plant resistant species.
Verticillium Wilt
Affected Plant Species: Maple Trees, Rose of Sharon, and Smoke Trees. Treatment: Remove affected plants, solarize soil, and plant resistant species.
Bacterial Wilt
Affected Plant Species: Cucumbers, Eggplants, and Ginger. Treatment: Rotate crops, use resistant varieties, and fumigate or solarize soil.
Armillaria Root Rot
Affected Plant Species: Conifers and Hardwoods. Treatment: Remove infected trees, improve soil drainage, avoid planting susceptible species in contaminated areas.
Fire Blight
Affected Plant Species: Pears, Apples, and Cotoneasters. Treatment: Prune infected branches, apply bactericides like streptomycin, plant resistant cultivars.
Anthracnose
Affected Plant Species: Dogwoods, Sycamores, and Avocado Trees. Treatment: Prune out dead wood, apply copper-based fungicides, and ensure good air circulation.
Nematode Infestations
Affected Plant Species: Tomatoes, Carrots, and Potatoes. Treatment: Use nematode-resistant varieties, rotate crops, apply organic matter or nematode-suppressing chemicals like fenamiphos.
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