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These disease snapshots cover a broad range of plant diseases such as fungi, bacteria, viruses, insects and abiotic stresses. By presenting a representative digital image and a brief description, the MU Plant Diagnostic Clinic aims to provide you with a quick and accurate diagnosis to solve your plant problems. In contrast to sample highlights, this section may include some insignificant but very interesting plant diseases that could broaden your knowledge of plant pathology.
American Dagger Caterpillar
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
Causal agent:Clavibacter michiganensis subspecies michiganensis Pathogen type: Bacterium Management: The use of pathogen-free seeds. Photo credit: Morgan Goodnight
Birch Sawfly Larvae
Causal agent:Cimbex femoratus Pathogen type: Insect Management: Tolerate it. Photo credit: James Glenn
Black Scale on Jasmine
Causal agent:Saissetia oleae Pathogen type: Insect Management: Scrape the scale off or use insecticidal soap.
Causal agent:Scolia dubia Pathogen type: Insect Management: Beneficial pollinator. No need to control.
Cedar-apple Rust on Juniper
Causal agent:Gymnosporangium spp. Pathogen type: Fungi Management: No need to control Photo credit: MU-PDC client
Cedar-hawthorn Rust
Causal agent:Gymnosporangium globosum Pathogen type: Fungi Management: No need to control Photo credit: Katie Kammler
Cedar-quince Rust
Causal agent:Gymnosporangium clavipes Pathogen type: Fungi Management: No need to control Photo credit: Patrick Byers
Cicada Damage
Causal agent: Cicada bugs Pathogen type: Insect Management: Removal of damaged branch, cover small tree with netting
Photo credit: Katie Kammler
Common Asparagus Beetle
Causal agent:Crioceris asparagi Pathogen type: Insect Management: Biological control and insecticide Photo credit: Debi Kelly
Common Orange Lichen
Causal agent:Xanthoria parietina Pathogen type: Lichen Management: No need to control. Photo credit: James Glenn
Eight-spotted Forester Caterpillar
Causal agent:Alypia cotomaculata Pathogen type: Insect Management: No need to control.
Elm Cockscomb Gall
Causal agent: Cockscomb gall aphid (Colopha compressa) Pathogen type: Insect Management: No need to control as the galls don't cause significant damage.
Causal agent:Andricus quercuscalicis Pathogen type: Insect Management: No need to control. Photo credit: James Glenn
Lace Bug on Oak
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
Causal agent:Oxyopidae spp.
Pathogen type: Insect Management: No need to control
Mealybugs
Causal agent:Planococcus spp. Pathogen type: Insect Management: Biological control and insecticide Photo credit: Katie Kammler