Sow & Tell
Plant diseases and problems: symptoms and what to do for 135 of them
Symptoms, look-alikes and what to do for 135 plant diseases and problems, from fungus and viruses to sunscald and blossom-end rot, from university Extension sources.
Fungus diseases
- Alternaria leaf spot (cabbage family)
- Anthracnose
- Apple scab
- Armillaria root rot
- Bitter rot
- Black knot
- Black rot of grape
- Black scurf and Rhizoctonia canker
- Black spot of rose
- Boxwood blight
- Brown rot
- Carrot leaf blights
- Cedar-apple rust
- Cedar-quince rust
- Cercospora leaf spot
- Chestnut blight
- Clubroot
- Common corn smut
- Common leaf spot of strawberry
- Cytospora canker of spruce
- Damping-off
- Daylily rust
- Diplodia tip blight
- Dogwood anthracnose
- Dutch elm disease
- Early blight
- Eastern filbert blight
- Fusarium wilt
- Gray mold (Botrytis)
- Gummy stem blight
- Hydrangea leaf spot
- Mummy berry
- Neck rot
- Needle cast (Rhizosphaera)
- Oak wilt
- Orange rust
- Peach leaf curl
- Pecan scab
- Pink root
- Plum pockets
- Powdery mildew
- Purple blotch
- Root and crown rot
- Rust
- Septoria leaf spot
- Slime molds
- Sooty blotch and flyspeck
- Sooty mold
- Southern blight
- Tar spot of maple
- Verticillium wilt
- White mold
Water molds
Bacterial diseases
Viruses
- Alfalfa mosaic
- Bean common mosaic
- Cucumber mosaic
- Curly top
- Hosta virus X
- Impatiens necrotic spot
- Lettuce mosaic
- Mosaic viruses
- Orchid viruses
- Pepper mild mottle
- Plant viruses
- Potato leafroll
- Potato virus Y
- Rose mosaic
- Rose rosette
- Squash mosaic
- Tobacco mosaic and tomato mosaic
- Tomato and tobacco ringspot
- Tomato brown rugose fruit virus
- Tomato spotted wilt
- Tomato yellow leaf curl
- Turnip mosaic
- Watermelon mosaic
- Zucchini yellow mosaic
Phytoplasmas
Not an infection
- Black walnut toxicity
- Blossom end rot
- Blotchy ripening and yellow shoulders
- Bolting (going to seed)
- Boron deficiency
- Catfacing
- Dog urine damage
- Drought stress
- Edema (oedema)
- Fertilizer burn
- Frost and freeze injury
- Fruit cracking
- Girdling roots
- Hail and wind damage
- Heat stress (blossom drop)
- Herbicide injury
- Hollow heart (potato)
- Iron chlorosis
- Leaf scorch
- Leaf sunburn
- Lichens and moss
- Magnesium deficiency
- Mechanical damage (mower, trimmer and tie wounds)
- Nitrogen deficiency
- Normal needle drop
- Nutrient deficiency
- Overwatering and waterlogged soil
- Ozone injury
- Phosphorus deficiency
- Poor pollination
- Potassium deficiency
- Road salt injury
- Soil compaction
- Soil pH problems
- Sunscald
- Tipburn
- Too little light (leggy plants)
- Transplant shock
- Volcano mulching
- Winter injury