Insect and Plant Disease Diagnostic Lab - Plant Disease Images
| Agastache (Giant Hyssop) | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Alder | |||
| - Alder Leaf Curl | Signs\Symptoms | ||
| - Ascochyta Leaf Spot | Signs\Symptoms | Pathogen | |
| Alfalfa | |||
| - Leptosphaerulina Leaf Spot | Signs\Symptoms | Pathogen | |
| Alyssum | |||
| - High EC, Low pH | Signs\Symptoms | ||
| Amelanchier | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Gymnosporangium | Signs\Symptoms | ||
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Apple | |||
| - Apple Scab | Signs\Symptoms | Pathogen | |
| - Cedar-Hawthorn Rust | Signs\Symptoms | Pathogen | |
| - Flyspeck | Signs\Symptoms | ||
| - Japanese Apple Rust | Signs\Symptoms | Pathogen | |
| - Nectria Canker | Signs\Symptoms | Pathogen | |
| - Sooty Blotch | Signs\Symptoms | ||
| - Winter Injury | Signs\Symptoms | ||
| Arborvitae (Thuja) | |||
| - Didymascella Leaf Blight | Signs\Symptoms | Pathogen | |
| - Pestalotiopsis Blight | Signs\Symptoms | Pathogen | |
| - Phyllosticta (associated with leaf blight) | Signs\Symptoms | Pathogen | |
| Ash | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Flower Gall | Signs\Symptoms | ||
| Astilbe | |||
| - Discosia | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Azalea | |||
| - Leaf Gall | Signs\Symptoms | ||
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Bacopa | |||
| - Botrytis Canker | Signs\Symptoms | Pathogen | |
| Basil | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Bay (Laurel) | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| Bean | |||
| - POTY Virus | Signs\Symptoms | ||
| - Uromyces Rust | Signs\Symptoms | Pathogen | |
| - Fusarium Rot | Signs\Symptoms | Pathogen | |
| Birch | |||
| - Gloeosporium | Pathogen | ||
| - Marssonina Leaf Spot | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| - Septoria | Signs\Symptoms | Pathogen | |
| Blueberry | |||
| - Colletotrichum | Signs\Symptoms | Pathogen | |
| - Witches’ Broom | Signs\Symptoms | ||
| Brambles | |||
| - Orange Rust | Signs\Symptoms | Pathogen | |
| Buckthorn | |||
| - Crown Rust | Signs\Symptoms | Pathogen | |
| Bugbane | |||
| - Ascochyta Leaf Spot | Signs\Symptoms | Pathogen | |
| Cabbage | |||
| - Black Rot | Signs\Symptoms | Pathogen | |
| Calendula | |||
| - Fusarium Wilt | Signs\Symptoms | Pathogen | |
| Calibrachoa | |||
| - Calibrachoa Mottle Virus | Signs\Symptoms | ||
| - Tobacco Mosaic Virus | Signs\Symptoms | ||
| Carrot | |||
| - Alternaria Leaf Blight | Signs\Symptoms | Pathogen | |
| Celery | |||
| - Alternaria Blight | Signs\Symptoms | Pathogen | |
| Chard | |||
| - Cercospora Leaf Spot | Signs\Symptoms | Pathogen | |
| Cimicifuga | |||
| - Ascochyta Leaf Spot | Signs\Symptoms | Pathogen | |
| Cissus | |||
| - Powdery Mildew | Signs\Symptoms | ||
| Clematis | |||
| - Leaf Spot | Signs\Symptoms | Pathogen | |
| Coleus | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Corn | |||
| - Common Smut | Signs\Symptoms | Pathogen | |
| - Alternaria Leaf Blight | Signs\Symptoms | Pathogen | |
| Cosmos | |||
| - White Smut | Signs\Symptoms | Pathogen | |
| Crucifers | |||
| - Club Root | Signs\Symptoms | ||
| Cucurbits | |||
| - Alternaria Leaf Spot | Signs\Symptoms | Pathogen | |
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Bacterial Wilt | Signs\Symptoms | ||
| - Belly Rot | Signs\Symptoms | Pathogen | |
| - Black Rot | Signs\Symptoms | Pathogen | |
| - Fusarium rot | Signs\Symptoms | ||
| - Phytophthora Fruit Rot | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| - Scab | Signs\Symptoms | Pathogen | |
| - Septoria Leaf Spot | Signs\Symptoms | Pathogen | |
| - Rodent Damage Response | Signs\Symptoms | ||
| - Unidentified Phytotoxicity | Signs\Symptoms | ||
| Daphne | |||
| - Golden Canker | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| - Septoria Leaf Spot | Signs\Symptoms | Pathogen | |
| - Tubercularia | Signs\Symptoms | Pathogen | |
| Daylily | |||
| - Aureobasidium | Signs\Symptoms | Pathogen | |
| - Leaf Streak | Signs\Symptoms | Pathogen | |
| Delphinium | |||
| - Phoma | Signs\Symptoms | Pathogen | |
| Douglas Fir | |||
| - Rhabdocline Needle Cast | Signs\Symptoms | ||
| - Swiss Needle Cast | Signs\Symptoms | Pathogen | |
| Elder | |||
| - Leaf Spot | Signs\Symptoms | Pathogen | |
| Elm | |||
| - Dutch Elm Disease | Signs\Symptoms | Pathogen | |
| - Phomopsis (secondary?) | Signs\Symptoms | Pathogen | |
| Euonymus | |||
| - Crown Gall | Signs\Symptoms | ||
| - Tubercularia | Signs\Symptoms | Pathogen | |
| Fir | |||
| - Broom Rust | Signs\Symptoms | Pathogen | |
| - Fir-Fern Rust | Signs\Symptoms | Pathogen | |
| - Phyllosticta Needle Blight | Signs\Symptoms | Pathogen | |
| - Rhizosphaera Needle Cast | Signs\Symptoms | Pathogen | |
| Fothergilla | |||
| - Botrytis | Signs\Symptoms | Pathogen | |
| Fuchsia | |||
| - Insecticidal Soap Damage | Signs\Symptoms | ||
| Garlic | |||
| - Embellisia Bulb Canker | Signs\Symptoms | Pathogen | |
| - Mushy Rot | Signs\Symptoms | Pathogen | |
| - POTY Virus Positive | Signs\Symptoms | ||
| - Rust | Signs\Symptoms | Pathogen | |
| - White Rot | Signs\Symptoms | Pathogen | |
| Geranium | |||
| - Bacterial Wilt | Signs\Symptoms | ||
| - Botrytis Leaf Spot | Signs\Symptoms | Pathogen | |
| - Oedema | Signs\Symptoms | ||
| - Pelargonium Flower Break Virus | Signs\Symptoms | ||
| - Pythium Root Rot | Signs\Symptoms | ||
| - Yellow Net Vein Virus | Signs\Symptoms | ||
| Grape | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Hawthorn | |||
| - Entomosporium | Signs\Symptoms | Pathogen | |
| - Phomopsis Canker | Signs\Symptoms | ||
| Hazelnut | |||
| - Eastern Filbert Blight | Signs\Symptoms | Pathogen | |
| Heuchera | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Hickory | |||
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Holly | |||
| - Glyphosate Injury | Signs\Symptoms | ||
| - Rust | Signs\Symptoms | Pathogen | |
| Honeysuckle | |||
| - Leaf Blight | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Hops | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Hosta | |||
| - Botrytis Leaf Spot | Signs\Symptoms | Pathogen | |
| - Cercospora | Signs\Symptoms | Pathogen | |
| - Crown Rot | Signs\Symptoms | Pathogen | |
| - Hosta Virus X | Signs\Symptoms | ||
| Impatiens, Garden | |||
| - Alternaria Leaf Spot | Signs\Symptoms | Pathogen | |
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Impatiens, New Guinea | |||
| - Myrothecium Leaf Spot | Signs\Symptoms | Pathogen | |
| Ipomoea | |||
| - Oedema | Signs\Symptoms | ||
| Iris | |||
| - Leaf Spot | Signs\Symptoms | Pathogen | |
| - Rhizome Rot | Signs\Symptoms | Pathogen | |
| Jack-in-the-pulpit | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Jostaberry | |||
| - White Pine Blister Rust | Signs\Symptoms | Pathogen | |
| Juniper | |||
| - Gymnosporangium Rust | Signs\Symptoms | Pathogen | |
| - Kabatina Twig Blight | Signs\Symptoms | Pathogen | |
| - Leptosphaeria (secondary?) | Signs\Symptoms | Pathogen | |
| - Oidiodendron (secondary) | Signs\Symptoms | Pathogen | |
| - Ojibwaya perpulchra (secondary) | Signs\Symptoms | Pathogen | |
| - Phomopsis Twig Blight | Signs\Symptoms | Pathogen | |
| - Tip Blight | Signs\Symptoms | Pathogen | |
| Lamium | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Lettuce | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| - Leaf Spot | Signs\Symptoms | Pathogen | |
| Lilac | |||
| - Ascochyta Blight | Signs\Symptoms | Pathogen | |
| - Leaf Spot | Signs\Symptoms | Pathogen | |
| Lily | |||
| - Botrytis Blight | Signs\Symptoms | ||
| - Poor bulb storage | Signs\Symptoms | ||
| Mallow | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Maple | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Cristulariella Leaf Spot | Signs\Symptoms | Pathogen | |
| - Leaf Blister | Signs\Symptoms | Pathogen | |
| - Stegonsporium Canker | Signs\Symptoms | Pathogen | |
| - Tar Spot | Signs\Symptoms | ||
| Mayapple | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Mountain Ash | |||
| - Entomosporium Leaf Spot | Signs\Symptoms | Pathogen | |
| Mountain Laurel | |||
| - Phytophthora Leaf Spot | Signs\Symptoms | ||
| Myrtle | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Ninebark | |||
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Oak | |||
| - Leaf Blister | Signs\Symptoms | Pathogen | |
| - Tubakia Leaf Spot | Signs\Symptoms | Pathogen | |
| - Botryosphaeria Canker | Signs\Symptoms | Pathogen | |
| Oat | |||
| - Crown Rust | Signs\Symptoms | Pathogen | |
| Onion | |||
| - Purple Blotch | Signs\Symptoms | Pathogen | |
| - Storage Rot | Signs\Symptoms | Pathogen | |
| Orchid | |||
| - Dendrobium – Anthracnose | Signs\Symptoms | Pathogen | |
| - Miltonia – Anthracnose | Signs\Symptoms | ||
| - Oncidium – Anthracnose | Signs\Symptoms | ||
| Pachysandra | |||
| - Volutella Blight | Signs\Symptoms | ||
| Pansy | |||
| - Black Root Rot | Signs\Symptoms | Pathogen | |
| Pea | |||
| - Ascochyta Leaf and Pod Spot | Signs\Symptoms | Pathogen | |
| - Mycosphaerella Blight | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Pear | |||
| - Fabraea Leaf Spot | Signs\Symptoms | Pathogen | |
| - Pear Scab | Signs\Symptoms | Pathogen | |
| Peony | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Botrytis | Signs\Symptoms | Pathogen | |
| - Cercospora Leaf Spot | Signs\Symptoms | Pathogen | |
| - Leaf Blotch | Signs\Symptoms | Pathogen | |
| - Peony Ringspot Virus | Signs\Symptoms | ||
| Pepper | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Fruit Rot | Signs\Symptoms | Pathogen | |
| - Fusarium | Signs\Symptoms | Pathogen | |
| - Thrips Damage | Signs\Symptoms | Insect | |
| - Oedema | Signs\Symptoms | ||
| Petunia | |||
| - Low pH; High Soluble Salt | Signs\Symptoms | ||
| Phlox | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Pine | |||
| - Coleosporium Needle Rust | Signs\Symptoms | Pathogen | |
| - Cyclaneusma | Signs\Symptoms | Pathogen | |
| - Dothistroma | Signs\Symptoms | Pathogen | |
| - Lophodermium Needle Blight | Signs\Symptoms | Pathogen | |
| - Ploioderma Needle Cast | Signs\Symptoms | Pathogen | |
| - Salt damage | Signs\Symptoms | ||
| - Sarea resinae (Secondary?) | Signs\Symptoms | Pathogen | |
| - Sphaeropsis (Diplodia) Blight | Signs\Symptoms | Pathogen | |
| - Stagonospora (Secondary?) | Signs\Symptoms | Pathogen | |
| - Truncatella Needle Blight | Signs\Symptoms | Pathogen | |
| - White Pine Blister Rust | Signs\Symptoms | Pathogen | |
| Poppy | |||
| - Alternaria Leaf Spot | Signs\Symptoms | Pathogen | |
| - Anthracnose Fruit Rot | Signs\Symptoms | Pathogen | |
| Potato | |||
| - Alternaria Leaf Spot | Signs\Symptoms | Pathogen | |
| - Botrytis | Signs\Symptoms | Pathogen | |
| - Chimeric Variegation | Signs\Symptoms | ||
| - Common Scab | Signs\Symptoms | ||
| - Fusarium Tuber Rot | Signs\Symptoms | Pathogen | |
| - Growth cracks | Signs\Symptoms | ||
| - Herbicide Damage | Signs\Symptoms | ||
| - Late Blight | Signs\Symptoms | Pathogen | |
| - Potato Virus Y | Signs\Symptoms | ||
| - Unidentified | Signs\Symptoms | Pathogen | |
| Privet | |||
| - Thedgonia Leafspot | Signs\Symptoms | Pathogen | |
| Quince | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Raspberry | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Raspberry Cane Maggot | Signs\Symptoms | Insect | |
| - Orange Rust | Signs\Symptoms | Pathogen | |
| Rhododendron | |||
| - Gray Leaf Blight | Signs\Symptoms | Pathogen | |
| Rose | |||
| - Black Spot | Signs\Symptoms | Pathogen | |
| - Rust | Signs\Symptoms | Pathogen | |
| Rosemary | |||
| - Botrytis | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | ||
| Rudbeckia | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| - Septoria | Signs\Symptoms | ||
| Rye | |||
| - Ergot | Signs\Symptoms | ||
| Schlumbergera | |||
| - Downy Mildew | Signs\Symptoms | ||
| Shepherd’s Purse | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Soybean | |||
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Spinach | |||
| - Cladosporium Leaf Spot | Signs\Symptoms | Pathogen | |
| - Downy Mildew | Signs\Symptoms | Pathogen | |
| Spruce | |||
| - Frost Injury | Signs\Symptoms | ||
| - Herbicide Injury | Signs\Symptoms | ||
| - Rhizosphaera Needle Cast | Signs\Symptoms | Pathogen | |
| - Sirococcus Blight | Signs\Symptoms | Pathogen | |
| - Spruce Needle Rust | Signs\Symptoms | Pathogen | |
| - Stigmina infection | Signs\Symptoms | Pathogen | |
| - Weir’s Cushion Rust | Signs\Symptoms | Pathogen | |
| Stone Fruit (Prunus) | |||
| - Black Knot | Signs\Symptoms | ||
| - Brown Rot | Signs\Symptoms | Pathogen | |
| - Cherry Leaf Spot | Signs\Symptoms | Pathogen | |
| - Peach Leaf Curl | Signs\Symptoms | Pathogen | |
| - Peach Scab | Signs\Symptoms | Pathogen | |
| - Peach Botrytis | Signs\Symptoms | Pathogen | |
| Strawberry | |||
| - Botrytis Rot | Signs\Symptoms | Pathogen | |
| Sunflower | |||
| - Septoria Leaf Spot | Signs\Symptoms | Pathogen | |
| Sweet Potato | |||
| - Oedema | Signs\Symptoms | ||
| Sweetbay Magnolia | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| Tomato | |||
| - Alice the Goon | |||
| - Alternaria Stem Lesion | Signs\Symptoms | Pathogen | |
| - Anthracnose | Signs\Symptoms | ||
| - Blossom End Rot | Signs\Symptoms | ||
| - Chimeric Variegation | Signs\Symptoms | ||
| - Cristulariella Leaf Spot | Signs\Symptoms | Pathogen | |
| - Early Blight | Signs\Symptoms | Pathogen | |
| - Late Blight | Signs\Symptoms | Pathogen | |
| - Leaf Mold | Signs\Symptoms | Pathogen | |
| - Magnesium Deficiency | Signs\Symptoms | ||
| - Oedema | Signs\Symptoms | ||
| - Septoria Leaf Spot | Signs\Symptoms | ||
| - Thrips Damage | Signs\Symptoms | Insect | |
| - White Mold | Signs\Symptoms | ||
| Tulip | |||
| - Botrytis Bulb Rot | Signs\Symptoms | Pathogen | |
| Turf | |||
| - Anthracnose | Signs\Symptoms | Pathogen | |
| - Crown Rust | Signs\Symptoms | Pathogen | |
| - Leptosphaerulina | Signs\Symptoms | Pathogen | |
| - Red Thread | Signs\Symptoms | Pathogen | |
| - Slime Mold | Signs\Symptoms | ||
| - Smut | Signs\Symptoms | Pathogen | |
| Vinca | |||
| - Phoma Stem Rot | Signs\Symptoms | Pathogen | |
| Violet | |||
| - Rust | Signs\Symptoms | Pathogen | |
| Wheat | |||
| - Leaf Rust | Signs\Symptoms | Pathogen | |
| - Powdery Mildew | Signs\Symptoms | Pathogen | |
| Witchhazel | |||
| - Blight | Signs\Symptoms | Pathogen | |
| Wild Ginger | |||
| - Black Root Rot | Signs\Symptoms | Pathogen | |
| Zinnia | |||
| - Alternaria Leaf Spot | Signs\Symptoms | Pathogen | |
