Diseases
Every disease the plant guides share, with the plants it hits and the timing that matters.
50 diseases290 plants covered so farlargest: root rot · 73
Most widespread first
73 plantsRoot RotMostly houseplants · Lamiaceae 1059 plantsPowdery MildewMostly perennials · Asteraceae 1234 plantsRustMostly perennials · Poaceae 524 plantsLeaf SpotMostly shrubs · Aquifoliaceae 321 plantsCrown RotMostly perennials · Ranunculaceae 317 plantsAlternaria Leaf SpotMostly annuals · Brassicaceae 1017 plantsDowny MildewMostly annuals · Brassicaceae 416 plantsVerticillium WiltMostly trees · Solanaceae 415 plantsDamping OffAll annuals · Solanaceae 413 plantsBotryosphaeria CankerMostly shrubs · Ericaceae 313 plantsMosaic VirusMostly annuals · Solanaceae 413 plantsWhite MoldMostly annuals · Fabaceae 311 plantsAster YellowsMostly perennials · Asteraceae 611 plantsCedar-Apple RustMostly trees · Rosaceae 910 plantsAnthracnoseMostly trees10 plantsBacterial Leaf SpotMostly annuals · Rosaceae 310 plantsBacterial Soft RotMostly annuals · Solanaceae 310 plantsClubrootMostly annuals · Brassicaceae 1010 plantsFrost DamageMostly annuals · Solanaceae 310 plantsRoot Knot NematodesMostly annuals · Solanaceae 39 plantsSalt BurnMostly houseplants · Asparagaceae 39 plantsSeptoria Leaf SpotMostly perennials · Asteraceae 39 plantsSouthern BlightMostly annuals · Solanaceae 39 plantsWinter BurnMostly trees · Cupressaceae 38 plantsBotrytisMostly annuals · Asteraceae 28 plantsBrown RotMostly trees · Rosaceae 88 plantsCrown GallMostly trees · Rosaceae 58 plantsCytospora CankerAll trees · Rosaceae 48 plantsPurple BlotchMostly perennials · Amaryllidaceae 87 plantsApple ScabMostly trees · Rosaceae 57 plantsBacterial Leaf ScorchAll trees7 plantsBlack RotAll annuals · Brassicaceae 77 plantsCercospora Leaf SpotMostly annuals · Amaranthaceae 37 plantsEdemaMostly annuals · Crassulaceae 37 plantsFusarium WiltMostly annuals · Cucurbitaceae 27 plantsPhytophthora BlightAll annuals · Cucurbitaceae 47 plantsTomato Spotted WiltAll annuals · Solanaceae 47 plantsTransplant ShockMostly shrubs · Ericaceae 36 plantsBlack KnotMostly trees · Rosaceae 66 plantsBlossom End RotAll annuals · Cucurbitaceae 36 plantsCurly TopAll annuals · Amaranthaceae 36 plantsFireblightMostly trees · Rosaceae 66 plantsLate BlightAll annuals · Solanaceae 66 plantsSooty Blotch and FlyspeckMostly trees · Rosaceae 56 plantsSunscaldMostly annuals · Cucurbitaceae 25 plantsEarly BlightAll annuals · Solanaceae 55 plantsHerbicide DriftAll annuals · Solanaceae 45 plantsPeach Leaf CurlAll trees · Rosaceae 45 plantsPhomopsis BlightMostly trees · Cupressaceae 35 plantsShot HoleAll trees · Rosaceae 5
Photo credits — 106 images
- Root Rot Scot Nelson · CC0
- Powdery Mildew David Gent, USDA Agricultural Research Service, Bugwood.org · CC BY 3.0
- Powdery Mildew Schlaghecken Josef · CC BY-SA 4.0
- Rust Sanjay Acharya · CC BY-SA 3.0
- Rust Plantpathfinder · CC BY-SA 3.0
- Leaf Spot Dr Parthasarathy Seethapathy, Tamil Nadu Agricultural University, Bugwood.org · CC BY 3.0 us
- Crown Rot H. J. Larsen · CC BY 3.0 US
- Alternaria Leaf Spot Howard F. Schwartz, Colorado State University, Bugwood.org
- Alternaria Leaf Spot Howard F. Schwartz, Colorado State University, Bugwood.org
- Downy Mildew Forest and Kim Starr · CC BY 3.0 US
- Verticillium Wilt no rights reserved · CC0
- Verticillium Wilt Z · CC BY
- Damping Off Howard F. Schwartz, Colorado State University, Bugwood.org
- Damping Off Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org
- Botryosphaeria Canker Katja Schulz · CC BY
- Botryosphaeria Canker Ben Armstrong · CC BY
- Botryosphaeria Canker Justin Paulin · CC BY
- Mosaic Virus James K. Douch · CC BY-SA
- Mosaic Virus Toadkeeper · CC BY
- Mosaic Virus no rights reserved · CC0
- White Mold Jie-Hao Ou · CC BY
- White Mold no rights reserved · CC0
- White Mold Adam J. Searcy · CC BY
- Aster Yellows Whitney Cranshaw, Colorado State University, Bugwood.org
- Aster Yellows Whitney Cranshaw, Colorado State University, Bugwood.org
- Cedar-Apple Rust no rights reserved · CC0
- Cedar-Apple Rust James Weaver · CC BY
- Cedar-Apple Rust Jason E. Farabaugh · CC BY
- Anthracnose Howard F. Schwartz, Colorado State University / Bugwood.org · CC BY 3.0 US
- Anthracnose Robert L. Anderson, USDA Forest Service, Bugwood.org · CC BY 3.0
- Bacterial Leaf Spot Howard F. Schwartz, Colorado State University, Bugwood.org
- Bacterial Leaf Spot Nancy Gregory, University of Delaware, Bugwood.org
- Bacterial Soft Rot Howard F. Schwartz, Colorado State University, Bugwood.org
- Bacterial Soft Rot Howard F. Schwartz, Colorado State University, Bugwood.org
- Clubroot Rasbak · CC BY-SA 3.0
- Frost Damage Joseph OBrien, USDA Forest Service, Bugwood.org
- Frost Damage Howard F. Schwartz, Colorado State University, Bugwood.org
- Root Knot Nematodes Edward Sikora, Auburn University, Bugwood.org
- Root Knot Nematodes Edward Sikora, Auburn University, Bugwood.org
- Salt Burn Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
- Salt Burn Howard F. Schwartz, Colorado State University, Bugwood.org
- Septoria Leaf Spot B. Phalan · CC BY
- Septoria Leaf Spot Stephen Thorpe · CC BY
- Septoria Leaf Spot Jake Dalzell · CC BY
- Southern Blight Jie-Hao Ou · CC BY
- Southern Blight Kurt Miller · CC BY-SA
- Southern Blight Bonnie Semmling · CC BY
- Winter Burn Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org
- Winter Burn Howard F. Schwartz, Colorado State University, Bugwood.org
- Botrytis Alexandre Dulaunoy · CC BY-SA 2.0
- Botrytis Schlaghecken Josef · CC BY 4.0
- Brown Rot Arthuc01 · CC BY-SA 3.0
- Brown Rot Mary Ann Hansen · CC BY 3.0 us
- Crown Gall Manfred Mielke, USDA Forest Service, Bugwood.org
- Crown Gall Eric Coombs, Oregon Department of Agriculture, Bugwood.org
- Cytospora Canker Mary K. Hanson · CC BY
- Cytospora Canker Christa Billias · CC BY
- Cytospora Canker Justin Paulin · CC BY
- Purple Blotch Howard F. Schwartz, Colorado State University, Bugwood.org
- Purple Blotch Howard F. Schwartz, Colorado State University, Bugwood.org
- Apple Scab Brandon Corder · CC BY
- Apple Scab Django Grootmyers · CC BY-SA
- Apple Scab Jennifer Arrow · CC BY
- Bacterial Leaf Scorch Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org
- Bacterial Leaf Scorch Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org
- Black Rot Clemson University / USDA Extension Slide Series · public domain
- Cercospora Leaf Spot Jamie O'Neill · CC BY
- Cercospora Leaf Spot Serenella Linares · CC BY
- Cercospora Leaf Spot Swarochi Tathagath · CC BY
- Edema David B. Langston, University of Georgia, Bugwood.org
- Edema Andrew Petrie, University of Toronto, Bugwood.org
- Fusarium Wilt Victor M. Vicente Selvas · CC BY-SA 3.0
- Phytophthora Blight Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org
- Phytophthora Blight Howard F. Schwartz, Colorado State University, Bugwood.org
- Tomato Spotted Wilt Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org
- Tomato Spotted Wilt Nancy Gregory, University of Delaware, Bugwood.org
- Transplant Shock Joseph OBrien, USDA Forest Service, Bugwood.org
- Transplant Shock Joseph OBrien, USDA Forest Service, Bugwood.org
- Black Knot Barry Langdon-Lassagne · CC BY
- Black Knot deefinder200 · CC BY
- Black Knot Jonathan De Simon · CC BY
- Blossom End Rot David B. Langston, University of Georgia, Bugwood.org
- Blossom End Rot Edward Sikora, Auburn University, Bugwood.org
- Curly Top Howard F. Schwartz, Colorado State University, Bugwood.org
- Curly Top Howard F. Schwartz, Colorado State University, Bugwood.org
- Fireblight Scot Nelson · CC0
- Fireblight Sebastian Stabinger · CC BY-SA 3.0
- Late Blight Igor Shelpiakov · CC BY
- Late Blight Markus Krieger · CC BY
- Sooty Blotch and Flyspeck no rights reserved · CC0
- Sooty Blotch and Flyspeck Paulius Rupšas · CC BY
- Sooty Blotch and Flyspeck Brian C. Hunt · CC BY
- Sunscald Howard F. Schwartz, Colorado State University, Bugwood.org
- Sunscald Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org
- Early Blight Michal Maňas · CC BY
- Herbicide Drift David B. Langston, University of Georgia, Bugwood.org
- Herbicide Drift Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
- Peach Leaf Curl Peter Chen 2.0 · CC BY
- Peach Leaf Curl Duarte Frade · CC BY
- Peach Leaf Curl no rights reserved · CC0
- Phomopsis Blight Justin Paulin · CC BY
- Phomopsis Blight Quinten Wiegersma · CC BY
- Phomopsis Blight Mark Apgar · CC BY
- Shot Hole Jamie O'Neill · CC BY
- Shot Hole Daniel Cahen · CC BY
- Shot Hole Carlos Muñoz-Amezcua · CC BY
Timing only — the label is the law
This page tells you when to watch for a disease and when treating is worth considering. It is not a recommendation to apply any particular product. Read and follow the product label before you spray — under federal law the label is the legal instruction, and using a pesticide against it is illegal.
- Check the pre-harvest interval. Every product that’s cleared for an edible crop sets a minimum number of days between spraying and picking. Find it on the label before you spray anything you intend to eat.
- Check the re-entry interval before you or anyone else works in the treated area again, and use the protective equipment the label names.
- Confirm the product is registered for your crop in your state. This page groups many different crops together, and a product legal on one of them is not legal on all of them — state registrations differ too. Your state pesticide agency or local extension office can confirm both.
- Rates and mixing instructions come from the label, never from us. We don’t publish them because they differ by product and formulation.