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USDA Forest Service

The U.S. Department of Agriculture Forest Service is a Federal agency that manages public lands in national forests and grasslands. The Forest Service is also the largest forestry research organization in the world, and provides technical and financial assistance to state and private forestry agencies. Gifford Pinchot, the first Chief of the Forest Service, summed up the purpose of the Forest Service—"to provide the greatest amount of good for the greatest amount of people in the long run."
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Image Subject Name Scientific Name Description
1502006 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust life cycle - title slide
1467417 white pine blister rust Cronartium ribicola teliospores germinating to form basidiospores
1593052 white pine blister rust Cronartium ribicola Branch flag
1470127 stalactiform blister rust Cronartium coleosporioides aecia
4215075 cedar-apple rust Gymnosporangium juniperi-virginianae telia on cedar
1467412 white pine blister rust Cronartium ribicola
2251001 western gall rust Endocronartium harknessii wind breakage at gall site
2733022 fusiform rust Cronartium quercuum f.sp. fusiforme rust hazard map for the southeast United States
3035084 fusiform rust Cronartium quercuum f.sp. fusiforme
2733023 fusiform rust Cronartium quercuum f.sp. fusiforme rust hazard map for the southeast United States
2250094 white pine blister rust Cronartium ribicola infested stand
2250095 comandra blister rust Cronartium comandrae infested stand
1406257 cedar-apple rust Gymnosporangium juniperi-virginianae
1406001 pine needle rust Coleosporium asterum aecia
1406002 pine needle rust Coleosporium asterum aecia
1467269 western gall rust Endocronartium harknessii aecia
1467011 western gall rust Endocronartium harknessii aecial gall
1467005 limb rust Peridermium filamentosum aecia
3036014 fusiform rust Cronartium quercuum f.sp. fusiforme closeup of telia
1377028 eastern pine gall rust Cronartium quercuum Several clustered galls
1396156 cedar-apple rust Gymnosporangium juniperi-virginianae
1406003 pine needle rust Coleosporium asterum aecia
1467264 western gall rust Endocronartium harknessii killed bishop pine
1406005 pine needle rust Coleosporium asterum
1406006 pine needle rust Coleosporium asterum
0355058 fusiform rust Cronartium quercuum f.sp. fusiforme branch gall
1396157 cedar-apple rust Gymnosporangium juniperi-virginianae
1442264 white pine blister rust Cronartium ribicola Stem swelling. July 1974
2250099 comandra blister rust Cronartium comandrae canker on lodgepole pine
1467423 white pine blister rust Cronartium ribicola red spot race; pseudosclerotium spot
1467446 white pine blister rust Cronartium ribicola corking out
1442040 comandra blister rust Cronartium comandrae showing aecia
3036001 fusiform rust Cronartium quercuum f.sp. fusiforme
1377009 cedar-apple rust Gymnosporangium juniperi-virginianae Telial stage
2250100 western gall rust Endocronartium harknessii on ponderosa pine
1470126 gall rust of jack pine Cronartium quercuum f.sp. banksianae
3036009 fusiform rust Cronartium quercuum f.sp. fusiforme multiple branch galls
1467282 stalactiform blister rust Cronartium coleosporioides aecia on canker
1467309 pinyon blister rust Cronartium occidentale
5299099 American hawthorn rust Gymnosporangium globosum Lesions on leaf upper surface
5061062 white pine blister rust Cronartium ribicola Early upper-leaf symptoms of Cronartium ribicola on Ribes.
1406008 pine needle rust Coleosporium asterum telia growing on alternate host
0355060 fusiform rust Cronartium quercuum f.sp. fusiforme close-up view of telia on oak leaves, the alternate host.
1442048 limb rust Peridermium filamentosum Roos National Forest Colorado, July 1974
1406004 pine needle rust Coleosporium asterum small trees
1406013 pine needle rust Coleosporium asterum
2250090 white pine blister rust Cronartium ribicola infested stand
3036007 fusiform rust Cronartium quercuum f.sp. fusiforme gall
5302004 white pine blister rust Cronartium ribicola Inoculating white pine with Cronartium ribicola in the lab
5302005 white pine blister rust Cronartium ribicola Inoculating white pine with Cronartium ribicola in the lab
5302009 white pine blister rust Cronartium ribicola Symptomatic white pine seedlings being screened for blister rust resistance
5302008 white pine blister rust Cronartium ribicola Greenhouse trials for white pine blister rust screening
5061087 white pine blister rust Cronartium ribicola White pine top kill
5061089 white pine blister rust Cronartium ribicola Small "flagged branches"
5061090 white pine blister rust Cronartium ribicola An infected branch flag in a large white pine
5061091 white pine blister rust Cronartium ribicola Small branch infection
5061092 white pine blister rust Cronartium ribicola Small branch infection
5061093 white pine blister rust Cronartium ribicola Several small branch infections on a single tree
5061094 white pine blister rust Cronartium ribicola Small branch infection
5061060 white pine blister rust Cronartium ribicola Early symptoms of white pine blister rust on the main bole of a sapling.
1377027 eastern pine gall rust Cronartium quercuum A sporulating gall (the orange-yellow pustules are aecia)nearly girdling a jack pine branch.
1467254 white pine blister rust Cronartium ribicola
1467255 white pine blister rust Cronartium ribicola rust needle spots
1467281 stalactiform blister rust Cronartium coleosporioides
0355051 southern cone rust Cronartium strobilinum Aecia on swollen, infected cone
1467276 limb rust Peridermium filamentosum
3035086 fusiform rust Cronartium quercuum f.sp. fusiforme pycnia
1467415 white pine blister rust Cronartium ribicola urediospores on Ribes spp.
0355067 fusiform rust Cronartium quercuum f.sp. fusiforme infected seedlings
0355052 white pine blister rust Cronartium ribicola Uredia stage on alternate host Ribes
1467445 white pine blister rust Cronartium ribicola hypersensative response to infection
5056094 white pine blister rust Cronartium ribicola White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard. Ribes plants used for cultivating Cronartium spores.
5054082 western gall rust Endocronartium harknessii Individual gall
5054083 western gall rust Endocronartium harknessii Gall of Peridermium harknessii
5054084 western gall rust Endocronartium harknessii Stem-girdling gall
5054085 western gall rust Endocronartium harknessii Jack pine gall rust individual gall
5054087 western gall rust Endocronartium harknessii Old gall of jack pine gall rust
5054089 western gall rust Endocronartium harknessii Jack pine gall rust, multiple galls
5056088 white pine blister rust Cronartium ribicola White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard
5056089 white pine blister rust Cronartium ribicola White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard
5056090 white pine blister rust Cronartium ribicola White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard
5042098 white pine blister rust Cronartium ribicola Aecial sacs of Cronartium ribicola on eastern white pine.
5032066 white pine blister rust Cronartium ribicola Top kill in white pine caused by white pine blister rust.
1501104 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust infected seedlings; Greenhouse
1400122 southwestern white-spored gall rust Peridermium (An undescribed species) White-spored gall rust in the Toiyabe National Forest, Nevada. Previously thought to be a white-spored variation of Western gall rust, this fungus is probably actually a distinct species.
1263083 eastern pine gall rust Cronartium quercuum Aecia
1263084 eastern pine gall rust Cronartium quercuum Uredinia on leaves
1263085 eastern pine gall rust Cronartium quercuum Telia
0746049 fusiform rust Cronartium quercuum f.sp. fusiforme Slash pine (Pinus elliottii) growing near Miley, South Carolina, with various symptoms caused by Cronartium quercuum f. sp. fusiforme, including stem and branch galls, basal whorls of galls, mortality, wind breakage (stems weakened by the disease).
0746050 fusiform rust Cronartium quercuum f.sp. fusiforme Slash pine (Pinus elliottii) growing near Miley, South Carolina, with various symptoms caused by Cronartium quercuum f. sp. fusiforme, including stem and branch galls, basal whorls of galls, mortality and wind breakage (stems weakened by the disease)
0746048 fusiform rust Cronartium quercuum f.sp. fusiforme Telia of Cronartium quercuum f. sp. fusiforme on northern red oak (Quercus rubra).
1473059 coronado limb rust Cronartium arizonicum aecia on twig
1473054 southwestern white-spored gall rust Peridermium (An undescribed species) White-spored gall rust with white spores and collored gall on Ponderosa pine. Although previously thought to be a white-spored variation of western gall rust, this rust is probably a distinctly separate species. A species description and valid scientific name is still pending. Mycologia, 90(2), 1998, pp244-257. http://www.jstor.org/stable/3761300
1473029 western gall rust Endocronartium harknessii Hip canker caused by the pine rust E. harnessii but most western forest pathologists use the older form-genus name Peridermium rather than the Yazu's construct.
1473031 western gall rust Endocronartium harknessii
1473058 limb rust Peridermium filamentosum aecia on twig
1520104 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust in a nursery bed
1502031 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; fruiting aecial stage - lob pine
1501103 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust infected seedlings
1502008 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; tree breakage at canker
1502011 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; stand showing many cankers
1502012 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; stand showing many cankers
1502014 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; aecial fruiting on stem gall
1502015 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; aecial fruiting on stem gall
1502029 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; fruiting aecial stage
1502030 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; fruiting aecial stage
1502032 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; fruiting branch canker (aecia)
1502034 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; fruiting aecial stage
1503052 southern cone rust Cronartium strobilinum Cone rust; slash pine
1503053 southern cone rust Cronartium strobilinum Cone rust; slash pine; North Lake City
1501096 eastern pine gall rust Cronartium quercuum Eastern gall rust; Va. Pine
1501084 cedar-apple rust Gymnosporangium juniperi-virginianae Cedar apple rust
1501081 cedar-apple rust Gymnosporangium juniperi-virginianae Cedar apple rust gall; E. red cedar
1501086 white pine blister rust Cronartium ribicola White pine blister rust; Ribes
1501087 white pine blister rust Cronartium ribicola White pine blister rust
1501088 white pine blister rust Cronartium ribicola White pine blister rust
1501090 white pine blister rust Cronartium ribicola White pine blister rust
1501093 white pine blister rust Cronartium ribicola White pine blister rust
5030005 western gall rust Endocronartium harknessii Non-sporulating gall
5030008 western gall rust Endocronartium harknessii Multiple galls
5030011 western gall rust Endocronartium harknessii
5030012 western gall rust Endocronartium harknessii Small gall
5030013 western gall rust Endocronartium harknessii Single gall on jack pine branch.
5030004 western gall rust Endocronartium harknessii Sporulating gall
5028061 cedar-apple rust Gymnosporangium juniperi-virginianae Telial-stage horns of the cedar-apple rust pathogen.
3035082 eastern pine gall rust Cronartium quercuum
3036006 eastern pine gall rust Cronartium quercuum Aecial stage of eastern gall rust on pine, VA
3036005 western gall rust Endocronartium harknessii 5 yr old scots pine
1501105 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; point of infection; Greenhouse
1501107 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; telia on oak leaf; Greenhouse
1501108 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; telia on oak leaf; Greenhouse
1501109 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; telia on oak leaf; Greenhouse
1501110 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; telia on oak leaf; Greenhouse
1501111 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; uredia on oak leaf; greenhouse
1502001 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; uredia on oak leaf; greenhouse
1502002 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; Pyvnial ooze; greenhouse
1502003 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; pycnial ooze; greenhouse
1502004 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; pycnial ooze; greenhouse
1502005 fusiform rust Cronartium quercuum f.sp. fusiforme Fusiform rust; pycnial ooze; greenhouse
3035100 pine needle rust Coleosporium asterum Aecial pustules of a needle rust on pine needles, MN
3035085 white pine blister rust Cronartium ribicola test outplantings of white pine, Dorena OR
3036010 white pine blister rust Cronartium ribicola ribes
3036011 white pine blister rust Cronartium ribicola Aecial stage on branch
3036004 American hawthorn rust Gymnosporangium globosum cedar-hawthorn rust
3036002 comandra blister rust Cronartium comandrae Aecial pustules on commandra rust on pine branch
5061063 white pine blister rust Cronartium ribicola
5061064 white pine blister rust Cronartium ribicola
5061066 white pine blister rust Cronartium ribicola
5061067 white pine blister rust Cronartium ribicola
5061075 white pine blister rust Cronartium ribicola cankers
5061078 white pine blister rust Cronartium ribicola
5061079 white pine blister rust Cronartium ribicola rust cankers
5061080 white pine blister rust Cronartium ribicola rust cankers
5061081 white pine blister rust Cronartium ribicola rust canker
5061083 white pine blister rust Cronartium ribicola
5061084 white pine blister rust Cronartium ribicola
5032062 white pine blister rust Cronartium ribicola copious resin flow
5032065 white pine blister rust Cronartium ribicola telia on Ribes sp.
5061030 white pine blister rust Cronartium ribicola
5047035 white pine blister rust Cronartium ribicola aecia
5047036 white pine blister rust Cronartium ribicola aecia
5061031 white pine blister rust Cronartium ribicola
5061033 white pine blister rust Cronartium ribicola
5061036 white pine blister rust Cronartium ribicola
5061038 white pine blister rust Cronartium ribicola
5061041 white pine blister rust Cronartium ribicola
5061042 white pine blister rust Cronartium ribicola
5061043 white pine blister rust Cronartium ribicola
5061044 white pine blister rust Cronartium ribicola
5061046 white pine blister rust Cronartium ribicola
5061047 white pine blister rust Cronartium ribicola
5061048 white pine blister rust Cronartium ribicola
5061054 white pine blister rust Cronartium ribicola
5061055 white pine blister rust Cronartium ribicola on alternate host
5061056 white pine blister rust Cronartium ribicola on alternate host
5061057 white pine blister rust Cronartium ribicola on alternate host
5061058 white pine blister rust Cronartium ribicola on alternate host
5061059 white pine blister rust Cronartium ribicola on alternate host
5037034 western gall rust Endocronartium harknessii
5050007 comandra blister rust Cronartium comandrae
5050009 comandra blister rust Cronartium comandrae
5043055 cedar-apple rust Gymnosporangium juniperi-virginianae
5043056 cedar-apple rust Gymnosporangium juniperi-virginianae
5043057 cedar-apple rust Gymnosporangium juniperi-virginianae
5043058 cedar-apple rust Gymnosporangium juniperi-virginianae close up of fruiting body
5043059 cedar-apple rust Gymnosporangium juniperi-virginianae
5043060 cedar-apple rust Gymnosporangium juniperi-virginianae close up of spore tubes
5043061 cedar-apple rust Gymnosporangium juniperi-virginianae
5043062 cedar-apple rust Gymnosporangium juniperi-virginianae
5043063 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043064 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043065 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043066 cedar-apple rust Gymnosporangium juniperi-virginianae
5043067 cedar-apple rust Gymnosporangium juniperi-virginianae
5043068 cedar-apple rust Gymnosporangium juniperi-virginianae
5043069 cedar-apple rust Gymnosporangium juniperi-virginianae
5043070 cedar-apple rust Gymnosporangium juniperi-virginianae
5043071 cedar-apple rust Gymnosporangium juniperi-virginianae
5043072 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043073 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043074 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043075 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043076 cedar-apple rust Gymnosporangium juniperi-virginianae
5043077 cedar-apple rust Gymnosporangium juniperi-virginianae
5043078 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043079 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043080 cedar-apple rust Gymnosporangium juniperi-virginianae telia
5043081 cedar-apple rust Gymnosporangium juniperi-virginianae telia
1467268 western gall rust Endocronartium harknessii aecia
1467271 western gall rust Endocronartium harknessii germinating aeciospores
1467304 comandra blister rust Cronartium comandrae
1467306 comandra blister rust Cronartium comandrae infection on alternate host; note blue rhizomes
1467308 comandra blister rust Cronartium comandrae germinating aeciospore
1467414 white pine blister rust Cronartium ribicola alternate host
1467256 white pine blister rust Cronartium ribicola
1467258 white pine blister rust Cronartium ribicola telia on underside of leaves
1467259 white pine blister rust Cronartium ribicola telial columns
1467416 white pine blister rust Cronartium ribicola telial horns
1467420 white pine blister rust Cronartium ribicola pseudosclerotium; 38um microtome section; red spot color bleached by water
1467421 white pine blister rust Cronartium ribicola red-green-island race; pseudosclerotium spot
1467422 white pine blister rust Cronartium ribicola red spot race; pseudosclerotium spot
1467424 white pine blister rust Cronartium ribicola yellow spot race; pseudosclerotium spot
1467425 white pine blister rust Cronartium ribicola yellow-green-island race; pseudosclerotium spot
1467429 white pine blister rust Cronartium ribicola phenotypically resistant trees selected from areas of high rust incidence
1467431 white pine blister rust Cronartium ribicola pollen to be collected from phenotypically resistant trees in areas of high rust incidence
1467434 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; bags applied to prevent insect damage
1467435 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; bags applied to prevent insect damage
1467438 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; cones collected and placed in greenhouse to dry
1467439 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; seeds from collected cones planted for progeny testing
1467440 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; seeds from collected cones planted for progeny testing; tents constructed for artificial inoculation
1467441 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; seeds from collected cones planted for progeny testing; tents used for artificial inoculation; infected wild Ribes spp. leaves placed over seedlings
1467442 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; seeds from collected cones planted for progeny testing; tents used for artificial inoculation; infected wild Ribes spp. leaves placed over seedlings; 100% relative humidity fo 4 days
1467443 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; seeds from collected cones planted for progeny testing; tents used for artificial inoculation; infected wild Ribes spp. leaves placed over seedlings; 100% relative humidity for 4 days
1467444 white pine blister rust Cronartium ribicola pollen collected from phenotypically resistant trees in areas of high rust incidence; seeds from collected cones planted for progeny testing; tents used for artificial inoculation; infected wild Ribes spp. leaves placed over seedlings; inspection for infections
1467448 white pine blister rust Cronartium ribicola slow fungus growth and tolerance; basal canker - 20-year-old canker on 21-year-old tree
1467449 white pine blister rust Cronartium ribicola commercial production of resistant seed in Moscow breeding arboretum
1467450 white pine blister rust Cronartium ribicola high mortality
1467451 white pine blister rust Cronartium ribicola after heavy mortality; ready for regeneration of naturally selected seedlings
1467274 limb rust Peridermium filamentosum aecial stage
1470129 sweet fern blister rust Cronartium comptoniae
1396158 cedar-apple rust Gymnosporangium juniperi-virginianae
1400125 cedar-apple rust Gymnosporangium juniperi-virginianae Telial horns from galls on cedar, following moist spring weather in southeast Minnesota.
1406132 sweet fern blister rust Cronartium comptoniae
1406009 pine needle rust Coleosporium asterum uredia growing on alternate host
1406010 pine needle rust Coleosporium asterum telia growing on alternate host
1198029 eastern pine gall rust Cronartium quercuum Indistinguishable from western gall rust (pine-pine rust, Endocronartium harknessii) without microscopic examination of spore germination.
1271005 white pine blister rust Cronartium ribicola Aecia on bole/truck. Mount Hood National Forest. Northern Oregon Cascades.
1301050 white pine blister rust Cronartium ribicola Ueredinial stage.
1501098 comandra blister rust Cronartium comandrae
1210058 western gall rust Endocronartium harknessii
1442046 western gall rust Endocronartium harknessii
1442039 comandra blister rust Cronartium comandrae
1442042 white pine blister rust Cronartium ribicola
2733024 fusiform rust Cronartium quercuum f.sp. fusiforme on bareroot nursery seedlings
3035081 fusiform rust Cronartium quercuum f.sp. fusiforme
3035087 fusiform rust Cronartium quercuum f.sp. fusiforme uredial stage
3035089 fusiform rust Cronartium quercuum f.sp. fusiforme
3036008 fusiform rust Cronartium quercuum f.sp. fusiforme
3036013 fusiform rust Cronartium quercuum f.sp. fusiforme
2251008 stalactiform blister rust Cronartium coleosporioides telia on alternate Castilleja host
2251011 stalactiform blister rust Cronartium coleosporioides cross-section of canker
2251005 western gall rust Endocronartium harknessii branch gall
2250089 white pine blister rust Cronartium ribicola ribes/inocolum
2250091 white pine blister rust Cronartium ribicola aecia
2250096 comandra blister rust Cronartium comandrae aecia
0364063 white pine blister rust Cronartium ribicola Pycnia
0364005 fusiform rust Cronartium quercuum f.sp. fusiforme close-up view of telia on oak
0355064 fusiform rust Cronartium quercuum f.sp. fusiforme uredinia on oak leaf
0355065 fusiform rust Cronartium quercuum f.sp. fusiforme close-up view of uredinia and telia

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