Explore a diverse collection of plant disease snapshots featuring images and brief descriptions to aid in quick and accurate diagnosis of plant health issues.

American Dagger Caterpillar
american dagger caterpillar
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Causal agent: Acronicta americana
Pathogen type: Insect
Management: Beware!! Poisonous!! Look it up before you pick it up.
Photo credit: MU-PDC client

Bacterial Canker of Tomato
bacterial canker of tomato
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Causal agent: Clavibacter michiganensis subspecies michiganensis
Pathogen type: Bacterium
Management: The use of pathogen-free seeds.
Photo credit: Morgan Goodnight

Birch Sawfly Larvae
birch sawfly larvae
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Causal agent: Cimbex femoratus
Pathogen type: Insect
Management: Tolerate it.
Photo credit: James Glenn

Black Scale on Jasmine
black scale on jasmine
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Causal agent: Saissetia oleae
Pathogen type: Insect
Management: Scrape the scale off or use insecticidal soap.

Blossom-end Rot of Tomato
blossom end rot
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Causal agent: Insufficient calcium
Pathogen type: Abiotic
Management: Fertilization
Photo credit: Dhruba Dhakal

Blue Winged Wasp
blue winged wasp
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Causal agent: Scolia dubia
Pathogen type: Insect
Management: Beneficial pollinator. No need to control.

Cedar-apple Rust on Juniper
cedar apple rust
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Causal agent: Gymnosporangium spp.
Pathogen type: Fungi
Management: No need to control
Photo credit: MU-PDC client

Cedar-hawthorn Rust
cedar hawthorn rust
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Causal agent: Gymnosporangium globosum
Pathogen type: Fungi
Management: No need to control
Photo credit: Katie Kammler

Cedar-quince Rust
cedar quince rust
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Causal agent: Gymnosporangium clavipes
Pathogen type: Fungi
Management: No need to control
Photo credit: Patrick Byers

Cicada Damage
cicada damage
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Causal agent: Cicada bugs
Pathogen type: Insect
Management: Removal of damaged branch, cover small tree with netting
Photo credit: Katie Kammler

Common Asparagus Beetle
common asparagus beetle
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Causal agent: Crioceris asparagi
Pathogen type: Insect
Management: Biological control and insecticide
Photo credit: Debi Kelly

Common Orange Lichen
common orange lichen
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Causal agent: Xanthoria parietina
Pathogen type: Lichen
Management: No need to control.
Photo credit: James Glenn

Eight-spotted Forester Caterpillar
eight-spotted forester caterpillar
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Causal agent: Alypia cotomaculata
Pathogen type: Insect
Management: No need to control.

Elm Cockscomb Gall
elm cockscomb gall
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Causal agent: Cockscomb gall aphid (Colopha compressa)
Pathogen type: Insect
Management: No need to control as the galls don't cause significant damage.

Elm Zigzag Sawfly
elm zigzag sawfly
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Causal agent: Aproceros leucopoda
Pathogen type: Insect
Management: Eradication and pesticide
Photo credit: Heather Huntington

Fall Webworm
fall webworm
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Causal agent: Hyphantria cunea
Pathogen type: Insect
Management: Not necessary if not severe.
Photo credit: TreeSMARTtrade

Flatheaded Wood Borers
flatheaded wood borers
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Causal agent: Buprestidae
Pathogen type: Insect
Management: Prevention and sanitation

Giant Swallowtail
giant swallowtail
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Causal agent: Papilio cresphontes
Pathogen type: Insect
Management: Chemical control applies to commercial citrus grower

Hackberry Nipple Galls
hackberry nipple galls
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Causal agent: Pachypsylla celtidismamma
Pathogen type: Insect
Management: Insignificant damage and no effective way to control

Heat Stress
heat stress
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Causal agent: Environmental stress
Pathogen type: Abiotic
Management: Good irrigation

Hollyhock Rust
hollyhock rust
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Causal agent: Puccinia heterospora
Pathogen type: Fungi
Management: Preventative fungicide application and sanitation
Photo credit: Katie Kammler

Horned Oak Gall
horned oak gall
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Causal agent: Callirhytis comigera
Pathogen type: Insect
Management: Insignificant damage and no effective way to control
Photo credit: MU-PDC client

Hosta Virus X (HVX)
hosta virus x
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Causal agent: HVX
Pathogen type: Virus
Management: Use virus free plants

Iron Chlorosis
iron chlorosis
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Causal agent: Iron deficiency and high PH
Pathogen type: Abiotic
Management: Fertilization
Photo credit: Katie Kammler

Japanese Maple Scale
japanese maple scale
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Causal agent: Lopholeucaspis japonica
Pathogen type: Insect
Management: Sanitation, dormant oil and insecticide
Photo credit: Morgan Goodnight

Juniper Bagworms
juniper bagworms
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Causal agent: Thyridopteryx ephemeraeformis (Haworth)
Pathogen type: Insect
Management: Hand-pick
Photo credit: Morgan Goodnight

Knopper Galls on Oak
knopper galls on oak
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Causal agent: Andricus quercuscalicis
Pathogen type: Insect
Management: No need to control.
Photo credit: James Glenn

Lace Bug on Oak
lace bug on oak
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Causal agent: Corythucha arcuata
Pathogen type: Insect
Management: High pressure water spray and application of insecticidal soaps and horticultural oil and pesticide.
Photo credit: James Glenn

Lynx Spider
lynx spider
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Causal agent: Oxyopidae spp.
Pathogen type: Insect
Management: No need to control

Mealybugs
mealybugs
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Causal agent: Planococcus spp.
Pathogen type: Insect
Management: Biological control and insecticide
Photo credit: Katie Kammler

Pear Rust (Cedar-hawthorn Rust)
pear rust
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Causal agent: Gymnosporangium globosum
Pathogen type: Fungi
Management: Preventative fungicide application and sanitation

 

Potassium Deficiency
potassium deficiency
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Causal agent: Potassium deficiency
Pathogen type: Abiotic
Management: Soil test and fertilization

Powdery Mildew on Bee Balm
powdery mildew on bee balm
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Causal agent: Golovinomyces monardae
Pathogen type: Fungi
Management: Proper sunlight, irrigation and fungicide
Photo credit: Katie Kammler

Powdery Mildew of Peperomia
powdery mildew of peperomia
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Causal agent: Podosphaera spp. or Erysiphe spp.
Pathogen type: Fungi
Management: Neem oil, milk, baking soda

Scales on Philodendron
scales on philodendron
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Causal agent: Scales
Pathogen type: Insect
Management: Sanitation, dormant oil and insecticide
Photo credit: Katie Kammler

Soybean Target Spot
soybean target spot
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Causal agent: Corynespora cassiicola
Pathogen type: Fungi
Management: Fungicide and resistant cultivar

Spittlebugs on Mint
spittlebugs
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Causal agent: Philaenus spp.
Pathogen type: Insect
Management: No significant damage. A quick blast of water.
Photo credit: Katie Kammler

Squash Bug
squash bug
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Causal agent: Anasa tristis spp.
Pathogen type: Insect
Management: Pick off early and insecticide.

Tar Spot of Maple
tar spot of maple
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Causal agent: Rhytisma spp.
Pathogen type: Fungi
Management: Preventative fungicide application and sanitation.

Tomato White Mold
tomato white mold
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Causal agent: Sclerotinia sclerotiorum
Pathogen type: Fungi
Management: Sanitation
Photo credit: MU-PDC client

Virgin Tiger Moth
virgin tiger moth
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Causal agent: Grammia virgo
Pathogen type: Insect
Management: No need to control. We don’t do that to anything associated with “tiger” in Missouri.

Wheel Bug Nymph
wheel bug nymph
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Causal agent: Arilus cristatus
Pathogen type: Insect
Management: Beneficial insects. No need to control.

White Fly on Christmas Cactus
white fly on christmas cactus
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Causal agent: Aleyrodidae spp.
Pathogen type: Insect
Management: Biological control or pesticide application.
Photo credit: James Glenn

White Pine Aphid
white pine aphid
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Causal agent: Cinara strobi
Pathogen type: Insect
Management: Neem oil and insecticidal soap
Photo credit: MU-PDC client

Woolly Bear Caterpillar
woolly bear caterpillar
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Causal agent: Pyrrharctia Isabella
Pathogen type: Insect
Management: No need to control.