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Colorado State University

Colorado State University is one of our nation's leading research universities with world-class research in infectious disease, atmospheric science, clean energy technologies, and environmental science. It was founded in 1870 as the Colorado Agricultural College, six years before the Colorado Territory became a state.

Colorado State University, located in Fort Collins, Colorado, is situated on nearly 5,000 acres of land, including the main campus, a foothills campus, an agricultural campus, and a mountain campus (Pingree Park). Colorado State also has 4,600 acres for research centers, Cooperative Extension offices, and Colorado State Forest Service stations.
Remove Filters: Bark Beetles and Phloem Feeding Insects(X) Field(X) Whitney Cranshaw(X)
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Image Subject Name Scientific Name Description
5024084 walnut twig beetle Pityophthorus juglandis Adult galleries and associated Geosmithia morbida infection in a ca. 10 cm. diameter branch.
5445294 walnut twig beetle Pityophthorus juglandis Host: black walnut Adults on penny showing relative to size
5445293 walnut twig beetle Pityophthorus juglandis Adults on penny showing relative size Host: black walnut
5443180 spruce beetle Dendroctonus rufipennis Tree mortality along White River in Rio Blanco County. This area was near the epicenter of the massive outbreak of this insect in the late 1940s. Photograph taken July 27, 2011.
5443181 spruce beetle Dendroctonus rufipennis Tree mortality along White River in Rio Blanco County. This area was near the epicenter of the massive outbreak of this insect in the late 1940s. Photograph taken July 27, 2011
5443183 spruce beetle Dendroctonus rufipennis Tree mortality along White River in Rio Blanco County. This area was near the epicenter of the massive outbreak of this insect in the late 1940s. Photograph taken July 27, 2011
1455159 blue spruce engraver Ips hunteri
1326058 blue spruce engraver Ips hunteri Crown dieback symptom if infestation
1326057 blue spruce engraver Ips hunteri Early crown fading symptom of infestation
1326060 blue spruce engraver Ips hunteri
1326059 blue spruce engraver Ips hunteri
5422221 walnut twig beetle Pityophthorus juglandis emergence holes
5406056 walnut twig beetle Pityophthorus juglandis Branch with dieback associated with infestation of walnut twig beetle in Arizona walnut. Associated with Thousand cankers disease.
5406057 walnut twig beetle Pityophthorus juglandis Adult beetles that emerged from two 18 inch black walnut logs. Walnut twig beetles continued to reinfest until cambium was completely consumed. A total of 23,040 beetles were recovered, approximately 36 per square inch of cambium area.
5406062 walnut twig beetle Pityophthorus juglandis Entry wounds made in trunk. A small amount of weeping can sometimes be observed when beetles enter trunks.
5406073 walnut twig beetle Pityophthorus juglandis Exit wounds made by adults.
5406084 walnut twig beetle Pityophthorus juglandis Exit wounds made by adults and larval tunneling in a branch.
5406051 walnut twig beetle Pityophthorus juglandis Teneral adults. A Geosmithia sp.fungus is sporulating profusely in the pupal chambers and cover the beetles.
5406055 walnut twig beetle Pityophthorus juglandis Twig dieback associated with infestation of walnut twig beetle in Arizona walnut. Associated with Thousand cankers disease.
5406040 walnut twig beetle Pityophthorus juglandis Last instar larva. Adjacent is a pupal cell with sporulating Geosmithia fungus.
5024085 walnut twig beetle Pityophthorus juglandis Adult gallery and associated Geosmithia sp. infection.
5024089 walnut twig beetle Pityophthorus juglandis adult gallery and associated Geosmithia sp. infection
5393507 mountain pine beetle Dendroctonus ponderosae Adult killed by pitch out
5393506 mountain pine beetle Dendroctonus ponderosae Pitch tubes on Scots pine
5393505 mountain pine beetle Dendroctonus ponderosae Pitch tubes on Scots pine
5393492 mountain pine beetle Dendroctonus ponderosae adult
5382186 walnut twig beetle Pityophthorus juglandis Egg galleries produced under bark of large branch.  
5382187 walnut twig beetle Pityophthorus juglandis Adults, including teneral adult, exposed from under bark.  
5382178 banded elm bark beetle Scolytus schevyrewi Pupa exposed from pupal chamber under bark.  
5382179 banded elm bark beetle Scolytus schevyrewi Last instar larvae and pupa exposed from under bark.  
5382180 banded elm bark beetle Scolytus schevyrewi Pupae in chambers under bark.  
5382181 banded elm bark beetle Scolytus schevyrewi Late stage larva at end of tunnel.  
5382182 banded elm bark beetle Scolytus schevyrewi Recently constructed entrance hole with small amount of weeping at wound site.  
5382183 walnut twig beetle Pityophthorus juglandis Extensive galleries produced in bark of large branch.  
5382184 walnut twig beetle Pityophthorus juglandis Exit holes.  
5382172 mountain pine beetle Dendroctonus ponderosae Female in gallery with eggs  
5382173 banded elm bark beetle Scolytus schevyrewi Dead adult in gallery with larval tunneling being initiated.  
5382175 banded elm bark beetle Scolytus schevyrewi Adult at entrance of gallery  
5382176 banded elm bark beetle Scolytus schevyrewi Pair mating at entrance of gallery.  
5382177 banded elm bark beetle Scolytus schevyrewi Last instar larvae and pupae exposed from under bark.  
5382164 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes  
5382165 mountain pine beetle Dendroctonus ponderosae Adult killed in “pitch-out” of ponderosa pine.  
5382166 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes  
5382167 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes  
5382168 mountain pine beetle Dendroctonus ponderosae Adult excavating tunnel.  Although this tree is still producing pitch, it has been heavily attacked by mountain pine beetle, and this adult beetle is excavating a larval gallery, treading the oozing pitch.  
5382169 mountain pine beetle Dendroctonus ponderosae Adult excavating tunnel.  Although this tree is still producing pitch, it has been heavily attacked by mountain pine beetle, and this adult beetle is excavating a larval gallery, treading the oozing pitch.  
5382170 mountain pine beetle Dendroctonus ponderosae Fresh pitch tube  
5382171 mountain pine beetle Dendroctonus ponderosae Adult killed in “pitch-out” of ponderosa pine  
5382162 mountain pine beetle Dendroctonus ponderosae Female in gallery with eggs  
5382131 walnut twig beetle Pityophthorus juglandis Flagging of lower shaded branches infested with walnut twig beetle.  
5382045 cedar bark beetles Phloeosinus spp. Twig die-back from maturation feeding by adult cedar bark beetles.  
5382042 cedar bark beetles Phloeosinus spp. Twig die-back from maturation feeding by adult cedar bark beetles.  
5382043 cedar bark beetles Phloeosinus spp. Twig die-back from maturation feeding by adult cedar bark beetle.  The opening to the feeding site is at the center of the picture.  
5382044 cedar bark beetles Phloeosinus spp. Twig die-back from maturation feeding by adult cedar bark beetle.  The area of the feeding site has been cut away and exposed.  
5382032 walnut twig beetle Pityophthorus juglandis Boring dust at entrance of gallery.   
5303006 red turpentine beetle Dendroctonus valens
5303007 red turpentine beetle Dendroctonus valens
5303092 mountain pine beetle Dendroctonus ponderosae Recently killed and fading lodgepole pine. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303093 mountain pine beetle Dendroctonus ponderosae Recently killed and fading lodgepole pine. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303094 mountain pine beetle Dendroctonus ponderosae Recently killed and fading lodgepole pine. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303095 mountain pine beetle Dendroctonus ponderosae Recently killed and fading lodgepole pine. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303096 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes produced within 6 weeks. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303097 mountain pine beetle Dendroctonus ponderosae Old pitch tubes produced previous year. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303098 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes produced within 6 weeks. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303100 mountain pine beetle Dendroctonus ponderosae Old pitch tubes produced previous year. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5082085 mountain pine beetle Dendroctonus ponderosae pitch out that successfully killed adult attempting to tunnel
5082087 mountain pine beetle Dendroctonus ponderosae dead adult in pitch out produced in tree defense
5024090 walnut twig beetle Pityophthorus juglandis Larvae associate with area of Fusarium infection on trunk.
5024091 walnut twig beetle Pityophthorus juglandis Twig dieback associated with twig beetle infestation.
5024087 walnut twig beetle Pityophthorus juglandis Late summer wilting associated with twig beetle and general decline in late summer.
5024088 walnut twig beetle Pityophthorus juglandis Extension larval tunnel in trunk area associated with Fusarium sp. infection.

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