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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

(65)

Whitefly

Woolly Beech Aphid

Flea beetle damage

Woolly Aphid

Scale Insects

Whiteflies

Mealybugs

Wax Scale

Psyllids

Foxglove Aphid

Animal Feeding Damage

Aphids

Black Scale

Root-Knot Nematodes

Aphids

Leafminers

Broad Mites

Slugs and Snails

Caterpillars

Mealybugs

Armored Scale

Shield Bugs

Leaf Miners

Currant Aphid

Insect Damage

Spider Mites

Thrips

Fungus Gnats

Spider Mites

Thrips

Fungus Gnats

Caterpillars

Root-Knot Nematodes

Aphids

Onion Aphid

Shivaphis

Mechanical Damage or Infestation

Scale Insects

Insect herbivory

Eurytetranychus

Aploneura

Scale Insects

Mechanical Damage or Herbivory

Protopulvinaria (Soft Scale)

Phylloxera

Cottony Scale (Pulvinaria)

Insect Chewing Damage

Eriophyid Mites

Mechanical damage or pest chewing

Eulecanium

Holes in leaves from chewing pests

Thrips damage

Bay sucker damage

Lace Bug (Stephanitis pyrioides)

Sarucallis

Leaf Miners

Thrips or Mite Infestation

Horse Chestnut Leaf Miner

Azalea lace bug

Leaf chewing damage

Bamboo Spider Mites (Stigmaeopsis)

Chewing insect damage

Mechanical insect damage

Leaf Miner Damage

Strawberry Mite

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Fungal

(66)

Rust

Cherry Witches' Broom

Powdery Mildew

Root Rot

Black Spot

Gray Mold (Botrytis Blight)

Anthracnose

Peach Leaf Curl

Brown Rot

Sooty Mold

Fusarium Wilt

Damping Off

Rust

Leaf Spot

Downy Mildew

Pythium Root Rot

Phyllachoraceae

Southern Blight

Verticillium Wilt

White Mold

Cercospora Leaf Spot

Phytophthora Root Rot

Phytophthora Blight

Canker

Clematis Wilt

Cladosporium Leaf Mold

Ramularia Leaf Spot

Shot Hole Disease

Crown Rot

Plum Pockets

Alternaria Leaf Spot

Septoria Leaf Spot

Cercospora Leaf Spot

Gray Mold (Botrytis Blight)

Apple scab

Chestnut Blight

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

Southern Blight

Passalora Leaf Spot

Colletotrichum orbiculare

Fusarium Wilt

Entomosporium leaf spot

Peach Scab

Graphiopsis chlorocephala

Brown patch

Septoria

Coniothyrium concentricum

Brown Spot

Cherry Leaf Spot

Fruit Rot

Sphaerulina Leaf Spot

White Rust (Albugo portulacae)

Colletotrichum gloeosporioides

Rhytisma

Tar spot of maple

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Nutrient Deficiency

(11)

Phosphorus Deficiency

Potassium Deficiency

Iron Deficiency

Magnesium Deficiency

Nitrogen Deficiency

Calcium Deficiency

Sulfur Deficiency

Zinc Deficiency

Boron Deficiency

Manganese Deficiency

Nutrient Deficiency

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Environmental

(67)

Severe Defoliation

Severe Defoliation and Dormancy

Leaf Drop (Environmental Stress)

Physical Leaf Damage

Low Light Stress

Underwatering

Low Humidity Stress

Edema

Sunburn (Sun Scorch)

Leaf Tip Necrosis

Heat Stress

Salt Buildup

Cold Damage

Overfertilization

Root-Bound

Poor Air Circulation

Soil pH Imbalance

Chemical Burn

Transplant Shock

Overwatering

Mechanical Damage (Cuts and Wounds)

Mechanical Damage

Underwatering

Pesticide Damage

Lack of Light

Mechanical Damage

Mechanical Damage and Leaf Scarring

Physical Damage and Scarring

Mechanical damage and scarring

Crown Dieback (Environmental Factors)

Spent Flower Spike

Physical Damage and Water Stress

Physical Damage or Herbivory

Etiolation and Leaf Drop

Dieback (Dead Wood)

Physical or Mechanical Damage

Heavy Dust Accumulation

Dust Accumulation

Physical or Mechanical Damage

Physical scarring

Mechanical damage and minor pest herbivory

Physical scarring and mechanical damage

Mechanical scarring

Spent Inflorescence

Mechanical damage and dust accumulation

Mechanical Damage

Mechanical damage and farina disturbance

Water spots

Mechanical Damage

Water Spots

Mechanical Damage

Physical Leaf Damage

Spent flower stalk

Artificial velvet coating

Branch Dieback and Leaf Yellowing

Mechanical damage and leaf detachment

Dormancy or Severe Dehydration

Mechanical leaf damage

Mechanical Damage and Scarring

Spent Flowers

Fragmentation and Browning

Mechanical Damage and Environmental Stress

Physical Scarring and Mechanical Damage

Mechanical Damage and Scarring

Physical Damage and Leaf Tears

Physical Damage and Dry Edges

Mechanical Leaf Damage and Scarring

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Bacterial

(16)

Bacterial Leaf Spot

Bacterial Soft Rot

Fire Blight

Crown Gall

Bacterial Wilt

Bacterial Blight

Bacterial Soft Rot

Bacterial Blight

Bacterial Canker

Bacterial Leaf Spot

Bacterial Wilt

Crown Gall

Phytoplasma

Citrus Greening (Huanglongbing)

Grapevine Yellows

Milkweed Yellows

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Viral

(7)

Leaf Curl Virus

Mosaic Virus

Amaranth Mosaic Virus

Ringspot Virus

Tomato Spotted Wilt Virus (TSWV)

Paulownia Witches' Broom

Rose Rosette Disease

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.