Narrow Results by:

Subject Specific Filters:

  1. Category:             

    Stem Decays and Cankers (6)

  1. Family:                  

    Nectriaceae (7)
    Hypocreaceae (1)
    Incertae sedis (1)

Image Specific Filters:

  1. Descriptor:           (show all)

    Symptoms (44)
    Fruiting Bodies (12)
    Asexual Spore (3)
    Culture (2)
    Feature(s) (2)

  1. Commodity:         

    Hardwood (59)
    Trees (8)
    Miscellaneous Forestry (4)
    Conifer (2)
    Miscellaneous Entomology (1)

Image Setting:

Field (61)
Museum (6)
Laboratory (5)

Person in Image:

Yes (1)

Sizes Available:

5 sizes(58)
4 sizes(13)
3 sizes(2)

Orientation:

Landscape (61)
Portrait (12)

Joseph O'Brien's Images

Title: Plant Pathologist
Organization: USDA Forest Service
Unit: Forest Health Protection
Country: United States

Joe is a plant pathologist with the U.S. Forest Service in St. Paul, Minnesota. in addition to photography, his major interests include tree diseases in forests, woodlands and urban areas, hazard tree identification and mitigation, and mycology. Joe is a graduate of the University of Michigan (B.S. Forestry and M.S. Forest Pathology) and the University of Minnesota (Ph.D. Plant Pathology), and currently works at the Northern Research Station on the University of Minnesota's St. Paul campus.
Remove Filters: Hypocreales(X) United States(X)
73 Images of 9 Subjects View Subject List View Image Details View Thumbnails

first prev Page: next last Display:

Image Subject Name Scientific Name Description
1198002 Neonectria canker Neonectria galligena on birch
1301056 beech bark canker Neonectria coccinea var. faginata Sporocarps, east shore of Lake Michigan, 2000.
1198001 Neonectria canker Neonectria galligena Perithecia of one of the fungi involved in the beech bark disease complex.
5061017 Fusarium wilts, blights, rots and damping-off Fusarium spp. Canker on walnut caused by Fusarium sp.
5061018 Fusarium wilts, blights, rots and damping-off Fusarium spp. Cankiers on the bole of a young walnut, caused by Fusarium sp.
5061019 Fusarium wilts, blights, rots and damping-off Fusarium spp. Canker at base of a young walnut
5061020 Fusarium wilts, blights, rots and damping-off Fusarium spp. Canker on the bole of a young walnut
5056033 Neonectria canker Neonectria galligena Perithecia
5056036 Neonectria canker Neonectria galligena Asci and spores
5035051 pitch canker Fusarium circinatum Flagging symptoms
5035052 pitch canker Fusarium circinatum Cankers and branch mortality
5048088 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease. Beech snap is common in stands affected by beech bark disease.
5048062 beech bark disease Nectria coccinea Cottony coverings of Cryptococcus fagisuga on American beech.
5048063 beech bark disease Nectria coccinea "Beech snap," commonly associated with beech bark disease.
5048070 beech bark disease Nectria coccinea Sampling beech for presence of Neonectria coccinea.
5048071 beech bark disease Nectria coccinea Cottony soverings of Cryptococcus fagisuga and tarry spots, associated with beech bark disease.
5048072 beech bark disease Nectria coccinea Examining a snapped beech affected by beech bark disease. People in image: Roger Mech, MI DNR; Manfred Mielke, USFS
5048073 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease.
5048075 beech bark disease Nectria coccinea with Cryptococcus fagisuga on the trunk of an American beech.
5048077 beech bark disease Nectria coccinea with Cryptococcus fagisuga on American beech.
5048078 beech bark disease Nectria coccinea Tarry spot on beech affected with beech bark disease.
5048080 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease.
5048081 beech bark disease Nectria coccinea Rough bark on American beech, which serves as a location for Cryptococcus fagisuga to become established.
5048087 beech bark disease Nectria coccinea Cryptococcus fagisuga on American beech, with tarry spots.
5042088 beech bark disease Nectria coccinea Mortality in a stand affected by beech bark disease.
5048082 beech bark disease Nectria coccinea Cryptococcus fagisuga on American beech. A small canker was found under a tarry spot, which was sampled for culturing.
5048085 beech bark disease Nectria coccinea Tarry spots on American beech affected with beech bark disease.
5048089 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease.
5048092 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease.
5048093 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease.
5048094 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease.
5048098 beech bark disease Nectria coccinea Tree mortality in a stand affected by beech bark disease.
5048099 beech bark disease Nectria coccinea Tarry spot with a small canker.
5048100 beech bark disease Nectria coccinea Multiple cankers on American beech affected by beech bark disease.
5049005 beech bark disease Nectria coccinea Beech snap, in a stand affected with beech bark disease.
5251060 beech bark disease Nectria coccinea Tarry spots and beech scale on American beech.
5251061 beech bark disease Nectria coccinea Tarry spots on American beech
5052048 Gliocladium roseum Gliocladium roseum
5052049 Gliocladium roseum Gliocladium roseum
5052050 Gliocladium roseum Gliocladium roseum
5052051 Gliocladium roseum Gliocladium roseum
5052052 Gliocladium roseum Gliocladium roseum
5037096 Neonectria canker Neonectria galligena Sporocarps of one of the fungi involved in beech bark disease.
5030044 Neonectria canker Neonectria galligena Sporocarps of one of the fungi that are involved in beech bark disease.
5039043 Nectria canker Nectria galligena perithecia
5039044 Neonectria canker Neonectria galligena perithecia
5039045 Neonectria canker Neonectria galligena perithecia
5030040 Nectria canker Nectria spp.
5045066 beech bark disease Nectria coccinea
5045067 Neonectria canker Neonectria galligena perithecia
5045068 Neonectria canker Neonectria galligena spores
5056016 Nectria canker Nectria spp.
5056017 Nectria canker Nectria spp.
5056018 Nectria canker Nectria spp.
5056019 Nectria canker Nectria spp.
5056020 Nectria canker Nectria spp.
5056021 Nectria canker Nectria spp.
5056022 Nectria canker Nectria spp.
5056023 Nectria canker Nectria spp.
5056024 Nectria canker Nectria spp.
5056025 Nectria canker Nectria spp.
5056026 Nectria canker Nectria spp.
5056027 Nectria canker Nectria spp.
5056030 Neonectria canker Neonectria galligena asci
5056031 Neonectria canker Neonectria galligena perithecia
5042087 Nectria canker Nectria spp. birch bark disease
5032044 Verticillium wilts Verticillium spp.
5032045 Verticillium wilts Verticillium spp.
5037026 Verticillium wilts Verticillium spp.
5034093 Nectria canker Nectria spp.
5056014 Nectria canker Nectria spp.
5056015 Nectria canker Nectria spp.
5056012 Nectria canker Nectria spp.

Page: