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All Plant Diseases | Complete Guide 2026
Complete guide to plant diseases: pests, fungi, bacteria, viruses and nutritional problems. Identify and treat each disease.
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Pests
(36) 🐛
Whitefly
🐛
Woolly Beech Aphid
🐛
Flea beetle damage
Medium 🐛
Woolly Aphid
🐛
Scale Insects
Medium 🐛
Whiteflies
High 🐛
Mealybugs
High 🐛
Wax Scale
🐛
Psyllids
🐛
Foxglove Aphid
🐛
Aphids
Medium 🐛
Black Scale
🐛
Root-Knot Nematodes
High 🐛
Aphids
🐛
Leafminers
Medium 🐛
Broad Mites
High 🐛
Slugs and Snails
Medium 🐛
Caterpillars
High 🐛
Mealybugs
🐛
Armored Scale
🐛
Shield Bugs
🐛
Leaf Miners
🐛
Currant Aphid
🐛
Insect Damage
Medium 🐛
Spider Mites
High 🐛
Thrips
Medium 🐛
Fungus Gnats
Medium 🐛
Spider Mites
🐛
Thrips
🐛
Fungus Gnats
🐛
Caterpillars
🐛
Root-Knot Nematodes
🐛
Aphids
🐛
Onion Aphid
🐛
Mechanical Damage or Infestation
Medium 🐛
Eriophyid Mites
🍄
Fungal
(48) 🍄
Rust
🍄
Cherry Witches' Broom
🍄
Powdery Mildew
Medium 🍄
Root Rot
High 🍄
Black Spot
High 🍄
Gray Mold (Botrytis Blight)
High 🍄
Anthracnose
High 🍄
Peach Leaf Curl
🍄
Brown Rot
🍄
Sooty Mold
Medium 🍄
Fusarium Wilt
High 🍄
Damping Off
High 🍄
Rust
Medium 🍄
Leaf Spot
Medium 🍄
Downy Mildew
High 🍄
Pythium Root Rot
High 🍄
Southern Blight
High 🍄
Verticillium Wilt
High 🍄
White Mold
High 🍄
Cercospora Leaf Spot
🍄
Phytophthora Root Rot
High 🍄
Phytophthora Blight
High 🍄
Canker
High 🍄
Cladosporium Leaf Mold
🍄
Ramularia Leaf Spot
🍄
Shot Hole Disease
🍄
Crown Rot
High 🍄
Plum Pockets
🍄
Alternaria Leaf Spot
High 🍄
Septoria Leaf Spot
High 🍄
Cercospora Leaf Spot
High 🍄
Gray Mold (Botrytis Blight)
High 🍄
Phyllosticta Leaf Spot
🍄
Black Spot
🍄
Anthracnose
🍄
Powdery Mildew
🍄
Grey Mould
🍄
Willow Anthracnose
🍄
Pestalotiopsis Leaf Spot
🍄
Cercospora Leaf Spot
🍄
Boxwood Blight
🍄
Downy Leaf Spot
🍄
Oak Leaf Blister
🍄
Phomopsis Tip Blight
Medium 🍄
Southern Blight
🍄
Passalora Leaf Spot
🍄
Colletotrichum orbiculare
🍄
Entomosporium leaf spot
Medium 🧪
Nutrient Deficiency
(11) 🧪
Phosphorus Deficiency
Medium 🧪
Potassium Deficiency
Medium 🧪
Iron Deficiency
Medium 🧪
Magnesium Deficiency
Medium 🧪
Nitrogen Deficiency
Medium 🧪
Calcium Deficiency
Medium 🧪
Sulfur Deficiency
Medium 🧪
Zinc Deficiency
Medium 🧪
Boron Deficiency
Medium 🧪
Manganese Deficiency
Medium 🧪
Nutrient Deficiency
Medium 🌡️
Environmental
(24) 🌡️
Severe Defoliation
High 🌡️
Low Light Stress
Medium 🌡️
Underwatering
High 🌡️
Low Humidity Stress
Medium 🌡️
Edema
Low 🌡️
Sunburn (Sun Scorch)
Medium 🌡️
Leaf Tip Necrosis
Medium 🌡️
Heat Stress
Medium 🌡️
Salt Buildup
Medium 🌡️
Cold Damage
Medium 🌡️
Overfertilization
Medium 🌡️
Root-Bound
Medium 🌡️
Poor Air Circulation
Medium 🌡️
Soil pH Imbalance
Medium 🌡️
Chemical Burn
High 🌡️
Transplant Shock
Medium 🌡️
Overwatering
Medium 🌡️
Mechanical Damage
Medium 🌡️
Underwatering
Medium 🌡️
Pesticide Damage
🌡️
Lack of Light
Medium 🌡️
Dieback (Dead Wood)
Medium 🌡️
Mechanical Damage
Low 🌡️
Mechanical Damage and Leaf Scarring
Low 🦠
Bacterial
(13) 🦠
Bacterial Leaf Spot
Medium 🦠
Bacterial Soft Rot
High 🦠
Fire Blight
Critical 🦠
Crown Gall
High 🦠
Bacterial Wilt
Critical 🦠
Bacterial Blight
🦠
Bacterial Soft Rot
🦠
Bacterial Blight
High 🦠
Bacterial Canker
High 🦠
Bacterial Leaf Spot
🦠
Bacterial Wilt
🦠
Crown Gall
🦠
Citrus Greening (Huanglongbing)
Critical 🔬
Viral
(4)Plant Disease Guide
Plant diseases can be caused by pests, fungi, bacteria, viruses or nutritional deficiencies. Correctly identifying the cause is essential to apply the right treatment and prevent the problem from spreading.