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USDA Forest Service

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."
Remove Filters: Diaporthales(X) Stem Decays and Cankers(X) Field(X)
83 Images of 9 Subjects View Subject List View Image Details View Thumbnails

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Image Subject Name Scientific Name Description
2251022 Cytospora cankers Cytospora spp. infected shoot
1400113 chestnut blight or canker Cryphonectria parasitica Canker on main stem; note dead branch in center of canker, discolored bark, and orange bumps (stroma) breaking through killed bark.
2251020 Cytospora cankers Cytospora spp. sunken necrotic area
2251021 Cytospora cankers Cytospora spp. canker injury
0364024 Phomopsis blight Phomopsis juniperivora tip dieback on redcedar
1400112 chestnut blight or canker Cryphonectria parasitica Lethal canker on main stem, with bark discoloration and orange stroma.
1400114 chestnut blight or canker Cryphonectria parasitica Orange stroma of cryphonectria emerging through bark of canker.
0488100 chestnut blight or canker Cryphonectria parasitica diseased chestnut
1442108 Phomopsis blight Phomopsis juniperivora
0364033 Phomopsis blight Phomopsis juniperivora general symptoms on redcedar
2251071 Cytospora canker Valsa sordida stem canker
2251070 Cytospora canker Valsa sordida
2251023 Cytospora cankers Cytospora spp.
1400120 Phomopsis cankers and twig blights Phomopsis spp. Phomopsis galls on the main stem of bitternut hickory in Wisconsin.
1470116 Phomopsis cankers and twig blights Phomopsis spp.
3046099 Phomopsis cankers and twig blights Phomopsis spp.
3046098 Phomopsis cankers and twig blights Phomopsis spp.
1301041 Phomopsis cankers and twig blights Phomopsis spp.
1442107 Phomopsis blight Phomopsis juniperivora
2251024 Cytospora cankers Cytospora spp.
1399117 Cytospora canker Valsa sordida Excised canker at base of tree, callous formation.
1467138 Cytospora canker of fir Cytospora abietis
1198030 Cytospora canker of spruce Valsa kunzei Causes branch death, especially in Colorado blue spruce.
1361160 Cytospora cankers Cytospora spp. Sunken lesions
5053097 chestnut blight or canker Cryphonectria parasitica Chestnut blight canker on American chestnut
5055024 Leucostoma canker of spruce Leucostoma kunzei Branch mortality in blue spruce caused by Leucostoma canker
5038034 Leucostoma canker of spruce Leucostoma kunzei Resin flow over branch canker.
5049007 chestnut blight or canker Cryphonectria parasitica Research activities concerning chestnut blight.  Person in image: Bill MacDonald
5037099 Leucostoma canker of spruce Leucostoma kunzei Resin flow on spruce branch caused by Cytospora canker, caused by Leucostoma kunzei.
5297092 chestnut blight or canker Cryphonectria parasitica Experimental treatment of chestnut blight cankers in Wisconsin.  Person in image:Linda Haugen
5297093 chestnut blight or canker Cryphonectria parasitica Field crew doing chestnut blight research in Wisconsin.
5297094 chestnut blight or canker Cryphonectria parasitica Chestnut blight cankers experimentally treated with hypovirulent strain of the pathogen.
5297095 chestnut blight or canker Cryphonectria parasitica Chestnut blight cankers experimentally treated with a hypovirulent strain of the pathogen.
5297096 chestnut blight or canker Cryphonectria parasitica Chestnut blight research in Wisconsin.  Person in image: Barb Spears
5297097 chestnut blight or canker Cryphonectria parasitica Chestnut blight cankers experimentally treated with a hypovirulent strain of the pathogen.
5297098 chestnut blight or canker Cryphonectria parasitica Farm site in Wisconsin where chestnut blight cankers were experimentally treated with a hypovirulent strain of the pathogen.
5297100 chestnut blight or canker Cryphonectria parasitica Field crew doing research on chestnut blight in Wisconsin.
5298001 chestnut blight or canker Cryphonectria parasitica Field crew doing research on chestnut blight in Wisconsin.
5298002 chestnut blight or canker Cryphonectria parasitica Field crew doing research on chestnut blight in Wisconsin.
5298003 chestnut blight or canker Cryphonectria parasitica Field crew doing research on chestnut blight in Wisconsin.
5298006 chestnut blight or canker Cryphonectria parasitica Field crew doing research on chestnut blight in Wisconsin.
5298007 chestnut blight or canker Cryphonectria parasitica Field crew doing research on chestnut blight in Wisconsin.
5298008 chestnut blight or canker Cryphonectria parasitica Field crew doing research on chestnut blight in Wisconsin.
5298009 chestnut blight or canker Cryphonectria parasitica Tree climbing field crew doing research on chestnut blight in Wisconsin.
1473155 Cytospora cankers Cytospora spp. Valsa (perfect stage) of Cytospora (imperfect)
1473185 Cytospora canker Valsa sordida spore horns; photo taken 10/1974
1473281 Cytospora cankers Cytospora spp. close-up of canker in image 1473280
1473280 Cytospora cankers Cytospora spp. 1941; perennial type Valsa canker on 6.2" dbh aspen marked for cutting on sanitation plot. Upper portion of canker recent and active.
1473063 Cytospora canker of spruce Valsa kunzei upper crown of dying spruce
1506071 chestnut blight or canker Cryphonectria parasitica Chestnut blight - branch symptoms
1506072 chestnut blight or canker Cryphonectria parasitica Chestnut blight - stem canker
1502078 orange hobnail canker Cryphonectria gyrosa Endothia gyrosa canker; spanish oak
5030032 Cytospora canker of spruce Valsa kunzei Cankers on the lower branches of a blue spruce.
5028096 Cytospora canker of spruce Valsa kunzei Cankers cause branch mortality, and can eventually result in the death of the tree.
5028097 Cytospora canker of spruce Valsa kunzei Infections usually start low in the tree, adn progress upward through the crown.
5028098 Cytospora canker of spruce Valsa kunzei Blue spruce in landscape with multiple branch cankers.
1397001 Cytospora canker of spruce Valsa kunzei
3037004 Phomopsis blight Phomopsis juniperivora Needle blight of redcedar
3037016 Phomopsis blight Phomopsis juniperivora
3035045 Phomopsis cankers and twig blights Phomopsis spp. Juniper blight, IN
5049071 chestnut blight or canker Cryphonectria parasitica epicormic sprouts
5049072 chestnut blight or canker Cryphonectria parasitica hypovirulence treatment; 06-01-2005
5055023 Cytospora canker of spruce Valsa kunzei
5050063 Cytospora canker of spruce Valsa kunzei
5049069 chestnut blight or canker Cryphonectria parasitica
5049070 chestnut blight or canker Cryphonectria parasitica
5050040 chestnut blight or canker Cryphonectria parasitica
5050041 chestnut blight or canker Cryphonectria parasitica
5050042 chestnut blight or canker Cryphonectria parasitica
5038032 Cytospora cankers Cytospora spp.
5038033 Cytospora cankers Cytospora spp.
5050054 Cytospora cankers Cytospora spp.
5050055 Cytospora cankers Cytospora spp.
5050056 Cytospora cankers Cytospora spp.
5050057 Cytospora cankers Cytospora spp.
5050058 Cytospora cankers Cytospora spp.
5050059 Cytospora cankers Cytospora spp.
5050060 Cytospora cankers Cytospora spp.
5050061 Cytospora cankers Cytospora spp.
5050062 Cytospora cankers Cytospora spp.
5050064 Cytospora cankers Cytospora spp.
5051071 orange hobnail canker Cryphonectria gyrosa
5037098 Cytospora cankers Cytospora spp. dead branches from cytospora canker

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