Disease snapshots

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.

  • Blossom-end Rot of Tomato

    blossom end rot

    Causal agent: Insufficient calcium
    Pathogen type: Abiotic
    Management: Fertilization
    Photo credit: Dhruba Dhakal

  • Cedar-apple Rust on Juniper

    cedar apple rust

    Causal agent: Gymnosporangium spp.
    Pathogen type: Fungi
    Management: No need to control
    Photo credit: MU-PDC client

  • Common Asparagus Beetle

    common asparagus beetle

    Causal agent: Crioceris asparagi
    Pathogen type: Insect
    Management: Biological control and insecticide
    Photo credit: Debi Kelly

  • Elm Cockscomb Gall

    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.

  • Elm Zigzag Sawfly

    elm zigzag sawfly

    Causal agent: Aproceros leucopoda
    Pathogen type: Insect
    Management: Eradication and pesticide
    Photo credit: Heather Huntington

  • Hackberry Nipple Galls

    hackberry nipple galls

    Causal agent: Pachypsylla celtidismamma
    Pathogen type: Insect
    Management: Insignificant damage and no effective way to control

  • Horned Oak Gall

    horned oak gall

    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

    Causal agent: HVX
    Pathogen type: Virus
    Management: Use virus free plants

  • Japanese Maple Scale

    japanese maple scale

    Causal agent: Lopholeucaspis japonica
    Pathogen type: Insect
    Management: Sanitation, dormant oil and insecticide
    Photo credit: Morgan Goodnight

  • Juniper Bagworms

    juniper bagworms

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

  • Poplar Marssonina Leaf Spot

    marssonial leaf spot

    Causal agent: Marssonina populi
    Pathogen type: Fungi
    Management: Sanitation

  • Tomato White Mold

    tomato white mold

    Causal agent: Sclerotinia sclerotiorum
    Pathogen type: Fungi
    Management: Sanitation
    Photo credit: MU-PDC client