Joseph O'Brien's Images @ Forestry Images

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.

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914 Images of 108 Subjects

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Subject	Scientific Name	Images
American beech	Fagus grandifolia	2
American hawthorn rust	Gymnosporangium globosum	1
annosum root disease	Heterobasidion annosum	12
apple scab	Venturia inaequalis	7
Armillaria root rots	Armillaria spp.	9
ash anthracnose	Gnomoniella fraxini	9
ash decline		3
ash heart rot	Perenniporia fraxinophila	1
ash root rot	Scytinostroma galactinum	2
ash yellows phytoplasma	Candidatus Phytoplasma fraxini	5
basal wound		1
beech bark disease	Nectria coccinea	18
black ash decline		3
black knot	Apiosporina morbosa	7
black rot	Ceratocystis fimbriata	1
blue stain	Chlorociboria aeruginascens	4
Blumeriella leaf spot of cherry and plum	Blumeriella jaapii	2
bronze leaf disease	Apioplagiostoma populi	2
brown spot needle blight of pine	Mycosphaerella dearnessii	4
burl and decay		2
butternut canker	Sirococcus clavigignenti-juglandacearum	8
canker		6
chestnut blight or canker	Cryphonectria parasitica	6
cold injury (low temperature)		2
comandra blister rust	Cronartium comandrae	4
crown gall	Rhizobium radiobacter	1
Cyclaneusma needle cast	Cyclaneusma minus	3
Cytospora canker of spruce	Valsa kunzei	4
Cytospora cankers	Cytospora spp.	11
deadwood and snags		2
decay		51
dieback		4
Diplodia blight	Sphaeropsis sapinea	89
Diplodia tip blights	Diplodia spp.	2
dogwood anthracnose	Discula destructiva	2
Dothistroma needle blight	Mycosphaerella pini	1
drought		1
Dutch elm disease	Ophiostoma ulmi	14
Eastern filbert blight	Anisogramma anomala	9
eastern pine gall rust	Cronartium quercuum	1
Ectomycorrhizae	Thelephora terrestris	1
Elytroderma needle cast of pine	Elytroderma deformans	1
Eutypella canker	Eutypella parasitica	34
eye spot	Phyllosticta minima	11
false tinder polypore	Phellinus igniarius	2
fir broom rust	Melampsorella caryophyllacearum	4
fire blight	Erwinia amylovora	1
frost and winter injury (general)		12
Fusarium wilts, blights, rots and damping-off	Fusarium spp.	4
grade change		1
Hypoxylon canker of aspen	Entoleuca mammata	3
Hypoxylon canker of oak	Biscogniauxia atropunctata atropunctata	6
included bark		1
iron deficiency		17
Leptographium root disease	Leptographium spp.	3
Leucostoma canker of spruce	Leucostoma kunzei	3
milk-white toothed polypore	Irpex lacteus	1
Nectria canker	Nectria spp.	16
needle blight of larch	Meria laricis	5
needle cast	Lophodermium seditiosum	2
Neonectria canker	Neonectria galligena	1
nutrient deficiency		1
oak anthracnose	Apiognomonia errabunda	15
oak decline		25
oak leaf blister	Taphrina caerulescens	11
oak tatters		6
oak wilt	Ceratocystis fagacearum	43
Ohia decline		2
orange hobnail canker	Cryphonectria gyrosa	1
Phomopsis cankers and twig blights	Phomopsis spp.	1
Phytophthora root and crown rots	Phytophthora spp.	2
Phytophthora root rot	Phytophthora cinnamomi	3
pitch canker	Fusarium circinatum	2
Ploioderma needle cast of pine	Ploioderma lethale	1
poor architecture		2
red oak borer	Enaphalodes rufulus	2
Rhizosphaera needle cast	Rhizosphaera kalkhoffii	10
risk tree		13
robustus conk	Phellinus robustus	1
root problems		1
sapsucker injury		1
Schweinitzii root and butt disease	Phaeolus schweinitzii	2
Scleroderris canker of pine and spruce	Gremmeniella abietina	3
Sirococcus blight of conifers	Sirococcus conigenus	35
slime flux		2
smooth patch of oak	Aleurodiscus oakesii	1
sooty mold		1
spruce broom rust	Chrysomyxa arctostaphyli	3
spruce decline		51
stalactiform blister rust	Cronartium coleosporioides	1
Strumella canker	Urnula craterium	5
sudden oak death	Phytophthora ramorum	122
sweet bay	Laurus nobilis	1
Swiss needle cast	Phaeocryptopus gaeumannii	2
sycamore anthracnose	Apiognomonia veneta	4
tar spot needlecast	Davisomycella ampla	2
transplant shock		1
unknown		1
Verticillium wilts	Verticillium spp.	3
western gall rust	Endocronartium harknessii	12
white heartwood rot	Phellinus tremulae	18
white oak	Quercus alba	1
white pine blister rust	Cronartium ribicola	48
white rot	Inonotus glomeratus	1
white spruce decline		1
witches' broom		1
woodpeckers		2
yellow birch decline		2

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Joseph O'Brien's Images