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Guide to Pests and Diseases

Click on pest or disease below for a detailed description and remedy. The quick guides are still in development.
  • I can describe what the pest is doing, but I don't know it's name or what it is. Check out our Quick Guide to Pests.
  • I can describe how the disease affects my plants, but I don't know it's name or what it is. Consult our Quick Guide to Diseases
  • I know what it looks like, but don't know what causes it. How do I find out? Consult our Photo Library of Pests and Diseases. Find and click on the photo that looks most like your probem.
  • I know the name of the pest or disease--how do I conquer it? Consult the alphabetical list of pests and diseases below, and click on your specific problem.

Alternaria Leaf Blight (Cucurbits)

Angular Leaf Spot (Cucurbits)

Anthracnose (Beans)

Anthracnose (Cucurbits)

Anthracnose (Tomatoes)


Apple Maggot

Apple Scab

Bacterial Brown Spot (Beans)

Bacterial Spot (Peaches)

Bacterial Wilt (Cucumbers)

Bean Leaf Beetle

Black Spot (Roses)

Blister Beetle

Blossom-End Rot (Tomatoes)

Brown Rot (Peaches)

Cabbage Looper & Cabbage Worm

Cabbage Maggot

Carrot Weevil

Cedar-Apple Rust

Codling Moth

Colorado Potato Beetle

Common Bacterial Blight (Beans)

Cucumber Beetle


Damping-Off (Lettuce)

Downy Mildew (Cucurbits)

Downy Mildew (Onions)

Downy Mildew on Roses

Early Blight (Potatoes & Tomatoes)

European Corn Borer

Fire Blight (Apples & Pears)

Flea Beetle

Fusarium Basal Rot (Onions)

Fusarium Root and Crown Rot (Tomatoes)

Fusarium Root Rot (on Beans)

Fusarium Root Rot (Peas)

Fusarium Wilt (Cucurbits)

Fusarium Wilt on Tomatoes

Gray Mold (Beans)

Gray Mold (Tomatoes)

Gypsy Moth

Halo Blight (Beans)

Iris Borer

Japanese Beetle

Late Blight (Tomatoes)


Mexican Bean Beetle

Mite and Spider Mite

Neck Rot (Onions)

Onion Thrip

Peach Leaf Curl

Pear Scab

Plum Curculio

Potato Leafhopper

Powdery Mildew (Roses)

Pythium Root Rot (Damping-Off) (Beans)

Pythium Root Rot (Damping-Off, Seed Rot) (Peas)

Pythium Rot (Damping-Off, Stem Rot) on Tomatoes

Pythium Wilt (Lettuce)

Rhizoctonia Root Rot (on Beans)

Root-Knot Nematodes

Rust (Roses)

Scab (Cucurbits)


Septoria Leaf Spot (Tomatoes)


Soft Rot (Onions)

Sooty Blotch and Fly Speck (Apples & Pears)

Spinach Leafminer

Squash Bug

Squash Mosaic Virus (Cucurbits)

Squash Vine Borer

Vine & Root Weevils



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