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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)
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Image Subject Name Scientific Name Description
5490304 Ips engraver beetles Ips spp. Tops of ponderosa pine killed by ips beetles
5490303 Ips engraver beetles Ips spp. Tops of ponderosa pine killed by ips beetles
5490305 Ips engraver beetles Ips spp. Tops of ponderosa pine killed by ips beetles
5490334 mountain pine beetle Dendroctonus ponderosae Verbenone sachets used to deter colonization of mountain pine beetle
5490369 mountain pine beetle Dendroctonus ponderosae Blue stain associated with mountain pine beetle
5490372 mountain pine beetle Dendroctonus ponderosae Galleries revealed because of debarking by woodpeckers
5490370 mountain pine beetle Dendroctonus ponderosae Pitch out of adult beetle
5490378 mountain pine beetle Dendroctonus ponderosae Campground closed during activities(tree removal, insecticide spraying) related to mountain pine beetle management
5490375 mountain pine beetle Dendroctonus ponderosae Campground closed during activities (tree removal, insecticide spraying) related to mountain pine beetle management.
5490379 mountain pine beetle Dendroctonus ponderosae Transition area where lodgepole pine and ponderosa pine intersect and are both attacked by mountain pine beetle.
5490374 mountain pine beetle Dendroctonus ponderosae Verbenone sachets used to repel oviposition
5490371 mountain pine beetle Dendroctonus ponderosae Galleries exposed because of debarking by woodpeckers
5490217 walnut twig beetle Pityophthorus juglandis Sachet containing lure (Compound X) attractive to walnut twig beetle
5490218 walnut twig beetle Pityophthorus juglandis Lindgren funnel with walnut twig beetle lure
5443184 spruce beetle Dendroctonus rufipennis Interpretive sign related to spruce beetle with image that is not in true proportion. Photograph taken July 27, 2011
5480143 bark beetle Xylechinus montanus Declivity.
5480141 bark beetle Xylechinus montanus
5480139 bark beetle Xylechinus montanus
5480140 bark beetle Xylechinus montanus
5480142 bark beetle Xylechinus montanus Club.
5480131 bark beetle Scolytodes schwarzi
5480133 bark beetle Scolytodes schwarzi Club.
5480132 bark beetle Scolytodes schwarzi
5480130 bark beetle Scolytodes schwarzi
5480129 bark beetle Scolytodes schwarzi Declivity.
5480152 bark beetle Pityokteines ornatus
5480128 bark beetle Pityokteines ornatus Club.
5480151 bark beetle Pycnarthrum hispidum Club.
5480126 small oak bark beetle Pseudopityophthorus minutissimus
5480127 small oak bark beetle Pseudopityophthorus minutissimus Declivity.
5480125 small oak bark beetle Pseudopityophthorus minutissimus
5480124 small oak bark beetle Pseudopityophthorus minutissimus Club.
5480123 small oak bark beetle Pseudopityophthorus minutissimus
5480122 bark beetle Pityotrichus barbatus Club.
5480121 bark beetle Pityotrichus barbatus
5480120 bark beetle Pityotrichus barbatus
5480118 bark beetle Pityotrichus barbatus
5480119 bark beetle Pityotrichus barbatus Declivity.
5480117 bark beetle Pityokteines ornatus
5480116 bark beetle Pityokteines ornatus
5480115 bark beetle Pityokteines ornatus Declivity.
5480108 bark beetle Pityogenes knechteli
5480105 bark beetle Pityogenes knechteli Club.
5480107 bark beetle Pityogenes knechteli
5480106 bark beetle Pityogenes knechteli Declivity.
5480104 bark beetle Pityogenes knechteli
5480114 walnut twig beetle Pityophthorus juglandis
5480113 walnut twig beetle Pityophthorus juglandis
5480112 walnut twig beetle Pityophthorus juglandis
5480111 walnut twig beetle Pityophthorus juglandis Declivity.
5480110 walnut twig beetle Pityophthorus juglandis Club.
5478032 bark beetle Dryoxylon onoharaensis
5478030 bark beetle Dryoxylon onoharaensis Declivity.
5478029 bark beetle Dryoxylon onoharaensis Club.
5478031 bark beetle Dryoxylon onoharaensis
5478033 bark beetle Dryoxylon onoharaensis
5478668 bark beetle Trischidias atoma
5478602 large elm beetle Scolytus scolytus Declivity.
5478576 bark beetle Pseudothysanoes hopkinsi Declivity.
5478634 bark beetle Trypophloeus populi
5478630 bark beetle Trypophloeus populi Club.
5478633 bark beetle Trypophloeus populi
5478631 bark beetle Trypophloeus populi Declivity.
5478632 bark beetle Trypophloeus populi
5478624 bark beetle Trischidias atoma
5478621 bark beetle Trischidias atoma Declivity.
5478620 bark beetle Trischidias atoma Club.
5478622 bark beetle Trischidias atoma
5478662 foureyed spruce bark beetle Polygraphus rufipennis
5478659 foureyed spruce bark beetle Polygraphus rufipennis Club.
5478658 foureyed spruce bark beetle Polygraphus rufipennis
5478661 foureyed spruce bark beetle Polygraphus rufipennis
5478660 foureyed spruce bark beetle Polygraphus rufipennis Declivity.
5478618 larger pine shoot beetle Tomicus piniperda
5478617 larger pine shoot beetle Tomicus piniperda Declivity.
5478619 larger pine shoot beetle Tomicus piniperda
5478615 larger pine shoot beetle Tomicus piniperda Club.
5478616 larger pine shoot beetle Tomicus piniperda
5478655 bark beetle Stenoclyptus sulcatus
5478657 bark beetle Stenoclyptus sulcatus
5478656 bark beetle Stenoclyptus sulcatus
5478653 bark beetle Stenoclyptus sulcatus Club.
5478652 large elm beetle Scolytus scolytus
5478654 bark beetle Stenoclyptus sulcatus Declivity.
5478604 large elm beetle Scolytus scolytus
5478601 large elm beetle Scolytus scolytus Club.
5478600 large elm beetle Scolytus scolytus
5478607 bark beetle Scolytogenes jalapae
5478608 bark beetle Scolytogenes jalapae
5478606 bark beetle Scolytogenes jalapae
5478609 bark beetle Scolytogenes jalapae Club.
5478605 bark beetle Scolytogenes jalapae Declivity.
5478594 bark beetle Pycnarthrum hispidum
5478593 bark beetle Pycnarthrum hispidum
5478591 bark beetle Pycnarthrum hispidum Declivity.
5478592 bark beetle Pycnarthrum hispidum
5478579 bark beetle Pseudothysanoes hopkinsi
5478577 bark beetle Pseudothysanoes hopkinsi
5478578 bark beetle Pseudothysanoes hopkinsi
5478575 bark beetle Pseudothysanoes hopkinsi Club.
5478589 silver fir beetle Pseudohylesinus sericeus
5478588 silver fir beetle Pseudohylesinus sericeus
5478587 silver fir beetle Pseudohylesinus sericeus Declivity.
5478586 silver fir beetle Pseudohylesinus sericeus Club.
5478585 silver fir beetle Pseudohylesinus sericeus
5478584 Monterey pine ips Pseudips mexicanus
5478583 Monterey pine ips Pseudips mexicanus
5478580 Monterey pine ips Pseudips mexicanus Club.
5478582 Monterey pine ips Pseudips mexicanus
5478581 Monterey pine ips Pseudips mexicanus Declivity.
5478574 bark beetle Procryphalus mucronatus
5478571 bark beetle Procryphalus mucronatus Declivity.
5478573 bark beetle Procryphalus mucronatus
5478572 bark beetle Procryphalus mucronatus
5478570 bark beetle Procryphalus mucronatus Club.
5478322 bark beetle Pityoborus comatus Declivity.
5478323 bark beetle Pityoborus comatus
5478324 bark beetle Pityoborus comatus
5478325 bark beetle Pityoborus comatus
5478321 bark beetle Pityoborus comatus Club.
5478320 bark beetle Phloeotribus lecontei
5478318 bark beetle Phloeotribus lecontei
5478317 bark beetle Phloeotribus lecontei Declivity.
5478319 bark beetle Phloeotribus lecontei
5478316 bark beetle Phloeotribus lecontei Club.
5477359 redwood bark beetle Phloeosinus sequoiae Declivity.
5477363 redwood bark beetle Phloeosinus sequoiae Club.
5477257 bark beetle Orthotomicus caelatus Declivity.
5477259 bark beetle Orthotomicus caelatus Club.
5478301 bark beetle Lymantor decipiens Declivity.
5478305 bark beetle Lymantor decipiens Club.
5478090 bark beetle Liparthrum squamosum Club.
5477341 bark beetle Hypothenemus crudiae Declivity.
5477347 pine engraver Ips pini Declivity.
5477346 pine engraver Ips pini Club.
5477340 bark beetle Hypothenemus crudiae Club.
5477337 mango bark beetle Hypocryphalus mangiferae Declivity.
5477336 mango bark beetle Hypocryphalus mangiferae Club.
5477330 goldenhaired bark beetle Hylurgus ligniperda Club.
5477331 goldenhaired bark beetle Hylurgus ligniperda Declivity.
5478048 bark beetle Hylurgops rugipennis pinifex Declivity.
5478052 bark beetle Hylurgops rugipennis pinifex Club.
5478049 bark beetle Hylurgops rugipennis pinifex Declivity.
5478044 native elm bark beetle Hylurgopinus rufipes Declivity.
5478043 native elm bark beetle Hylurgopinus rufipes Club.
5478035 bark beetle Hylesinus criddlei Declivity.
5478034 bark beetle Hylesinus criddlei Club.
5477322 bark beetle Hylastes gracilis Declivity.
5477321 bark beetle Hylastes gracilis Clubs.
5478299 bark beetle Dryocoetoides cristatus Declivity.
5478297 bark beetle Dryocoetoides cristatus Club.
5477311 western balsam bark beetle Dryocoetes confusus Club.
5477312 western balsam bark beetle Dryocoetes confusus Declivity.
5478019 bark beetle Dolurgus pumilus Club.
5478292 bark beetle Dolurgus pumilus Declivity.
5478015 bark beetle Dendroterus texanus Declivity.
5478286 bark beetle Dendroterus texanus Club.
5477297 mountain pine beetle Dendroctonus ponderosae Declivity.
5477296 mountain pine beetle Dendroctonus ponderosae Club.
5477562 bark beetle Crypturgus alutaceus Declivity.
5477561 bark beetle Crypturgus alutaceus Club.
5477555 bark beetle Cryphalus ruficollis Declivity.
5477551 bark beetle Cryphalus ruficollis Club.
5477537 bark beetle Cnemonyx ficus Declivity.
5477536 bark beetle Cnemonyx ficus Club.
5477273 bark beetle Chramesus hicoriae Declivity.
5477272 bark beetle Chramesus hicoriae Club.
5477531 bark beetle Chaetophloeus hystrix Club.
5477532 bark beetle Chaetophloeus hystrix Declivity.
5477527 bark beetle Carphoborus pinicolens Declivity.
5477526 bark beetle Carphoborus pinicolens Club.
5477521 bark beetle Carphobius arizonicus Club.
5477522 bark beetle Carphobius arizonicus Declivity.
5477516 bark beetle Cactopinus desertus Declivity.
5477520 bark beetle Cactopinus desertus Club.
5477510 bark beetle Araptus hymenaeae Club.
5477511 bark beetle Araptus hymenaeae Declivity.
5477261 alder bark beetle Alniphagus aspericollis Club.
5477262 alder bark beetle Alniphagus aspericollis Declivity.
5478304 bark beetle Lymantor decipiens
5478302 bark beetle Lymantor decipiens
5478303 bark beetle Lymantor decipiens
5478091 bark beetle Liparthrum squamosum
5478092 bark beetle Liparthrum squamosum
5478051 bark beetle Hylurgops rugipennis pinifex
5478053 bark beetle Hylurgops rugipennis pinifex
5478050 bark beetle Hylurgops rugipennis pinifex
5478047 native elm bark beetle Hylurgopinus rufipes
5478046 native elm bark beetle Hylurgopinus rufipes
5478045 native elm bark beetle Hylurgopinus rufipes
5478038 bark beetle Hylesinus criddlei
5478037 bark beetle Hylesinus criddlei
5478036 bark beetle Hylesinus criddlei
5478300 bark beetle Dryocoetoides cristatus
5478026 bark beetle Dryocoetoides cristatus
5478296 bark beetle Dryocoetoides cristatus
5478295 bark beetle Dolurgus pumilus
5478294 bark beetle Dolurgus pumilus
5478293 bark beetle Dolurgus pumilus
5478290 bark beetle Dendroterus texanus
5478289 bark beetle Dendroterus texanus
5478016 bark beetle Dendroterus texanus
5477361 redwood bark beetle Phloeosinus sequoiae
5477360 redwood bark beetle Phloeosinus sequoiae
5477362 redwood bark beetle Phloeosinus sequoiae
5477258 bark beetle Orthotomicus caelatus
5477255 bark beetle Orthotomicus caelatus
5477256 bark beetle Orthotomicus caelatus
5477348 pine engraver Ips pini
5477349 pine engraver Ips pini
5477345 pine engraver Ips pini
5477342 bark beetle Hypothenemus crudiae
5477343 bark beetle Hypothenemus crudiae
5477344 bark beetle Hypothenemus crudiae
5477339 mango bark beetle Hypocryphalus mangiferae
5477338 mango bark beetle Hypocryphalus mangiferae
5477335 mango bark beetle Hypocryphalus mangiferae
5477334 goldenhaired bark beetle Hylurgus ligniperda
5477332 goldenhaired bark beetle Hylurgus ligniperda
5477333 goldenhaired bark beetle Hylurgus ligniperda
5477324 bark beetle Hylastes gracilis
5477323 bark beetle Hylastes gracilis
5477320 bark beetle Hylastes gracilis
5477308 western balsam bark beetle Dryocoetes confusus
5477314 western balsam bark beetle Dryocoetes confusus
5477305 western balsam bark beetle Dryocoetes confusus
5477298 mountain pine beetle Dendroctonus ponderosae
5477299 mountain pine beetle Dendroctonus ponderosae
5477295 mountain pine beetle Dendroctonus ponderosae
5477564 bark beetle Crypturgus alutaceus
5477565 bark beetle Crypturgus alutaceus
5477563 bark beetle Crypturgus alutaceus
5477554 bark beetle Cryphalus ruficollis
5477552 bark beetle Cryphalus ruficollis
5477553 bark beetle Cryphalus ruficollis
5477538 bark beetle Cnemonyx ficus
5477539 bark beetle Cnemonyx ficus
5477540 bark beetle Cnemonyx ficus
5477274 bark beetle Chramesus hicoriae
5477271 bark beetle Chramesus hicoriae
5477270 bark beetle Chramesus hicoriae
5477533 bark beetle Chaetophloeus hystrix
5477534 bark beetle Chaetophloeus hystrix
5477535 bark beetle Chaetophloeus hystrix
5477530 bark beetle Carphoborus pinicolens
5477529 bark beetle Carphoborus pinicolens
5477528 bark beetle Carphoborus pinicolens
5477525 bark beetle Carphobius arizonicus
5477524 bark beetle Carphobius arizonicus
5477523 bark beetle Carphobius arizonicus
5477519 bark beetle Cactopinus desertus
5477517 bark beetle Cactopinus desertus
5477518 bark beetle Cactopinus desertus
5477515 bark beetle Cactopinus desertus
5477513 bark beetle Araptus hymenaeae
5477514 bark beetle Araptus hymenaeae
5477512 bark beetle Araptus hymenaeae
5477263 alder bark beetle Alniphagus aspericollis
5477264 alder bark beetle Alniphagus aspericollis
5477260 alder bark beetle Alniphagus aspericollis
5024084 walnut twig beetle Pityophthorus juglandis Adult galleries and associated Geosmithia morbida infection in a ca. 10 cm. diameter branch.
5406093 walnut twig beetle Pityophthorus juglandis External weeping noticeable around walnut twig beetle tunnels.
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
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
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.
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
5422220 walnut twig beetle Pityophthorus juglandis Adult walnut twig  beetle tunnel and surrounding canker produced by Geosmithia in southern California  walnut.
5406092 walnut twig beetle Pityophthorus juglandis External weeping noticeable around walnut twig beetle tunnels.
5406087 walnut twig beetle Pityophthorus juglandis Branch cankers that have developed around twig beetle galleries. Associated with Thousand cankers disease.
5406082 walnut twig beetle Pityophthorus juglandis Lindgren funeling trapping of walnut twig beetle in Wheat Ridge, colorado. tree died during spring 2009.
5406059 walnut twig beetle Pityophthorus juglandis Pupae within trunk.
5406060 walnut twig beetle Pityophthorus juglandis Larvae and pupa. The geosmithia fungal associate is sporulating profusely around the pupal cells.
5406064 walnut twig beetle Pityophthorus juglandis Logs skinned with a draw knife. These logs were highly attractive to adults, but larval survival was not noted in the skinned logs.
5406061 walnut twig beetle Pityophthorus juglandis Beetle gallery in Arizona wlanut. Callus tissue borders and confines this point of injury.
5406063 walnut twig beetle Pityophthorus juglandis External view of beetle gallery in Arizona walnut. Callus tissue borders and confines this point of injury.
5406065 walnut twig beetle Pityophthorus juglandis Logs debarked with a chain saw. Numerous larvae successfully completed development in this log.
5406058 walnut twig beetle Pityophthorus juglandis Adult beetles withini nuptial chamber.
5406062 walnut twig beetle Pityophthorus juglandis Entry wounds made in trunk. A small amount of weeping can sometimes be observed when beetles enter trunks.
5406084 walnut twig beetle Pityophthorus juglandis Exit wounds made by adults and larval tunneling in a branch.
5406056 walnut twig beetle Pityophthorus juglandis Branch with dieback associated with infestation of walnut twig beetle in Arizona walnut. Associated with Thousand cankers disease.
5406073 walnut twig beetle Pityophthorus juglandis Exit wounds made by adults.
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.
5406055 walnut twig beetle Pityophthorus juglandis Twig dieback associated with infestation of walnut twig beetle in Arizona walnut. Associated with Thousand cankers disease.
5406051 walnut twig beetle Pityophthorus juglandis Teneral adults. A Geosmithia sp.fungus is sporulating profusely in the pupal chambers and cover the beetles.
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
5393503 mountain pine beetle Dendroctonus ponderosae Adult on penny to show size
5393492 mountain pine beetle Dendroctonus ponderosae adult
5361548 bark beetles Interesting textures created by bark beetles and wood borers under the bark of a log in Rocky Mountain National Park.
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.  
5382184 walnut twig beetle Pityophthorus juglandis Exit holes.  
5382183 walnut twig beetle Pityophthorus juglandis Extensive galleries produced in bark of large branch.  
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.  
5382179 banded elm bark beetle Scolytus schevyrewi Last instar larvae and pupa exposed from under bark.  
5382178 banded elm bark beetle Scolytus schevyrewi Pupa exposed from pupal chamber under bark.  
5382182 banded elm bark beetle Scolytus schevyrewi Recently constructed entrance hole with small amount of weeping at wound site.  
5382175 banded elm bark beetle Scolytus schevyrewi Adult at entrance of gallery  
5382173 banded elm bark beetle Scolytus schevyrewi Dead adult in gallery with larval tunneling being initiated.  
5382172 mountain pine beetle Dendroctonus ponderosae Female in gallery with eggs  
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  
5382166 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes  
5382165 mountain pine beetle Dendroctonus ponderosae Adult killed in “pitch-out” of ponderosa pine.  
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  
5382167 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes  
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.  
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.  
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.  
5382032 walnut twig beetle Pityophthorus juglandis Boring dust at entrance of gallery.   
5303094 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
5303100 mountain pine beetle Dendroctonus ponderosae Old pitch tubes produced previous year. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303092 mountain pine beetle Dendroctonus ponderosae Recently killed and fading lodgepole pine. 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
5303093 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
5303098 mountain pine beetle Dendroctonus ponderosae Fresh pitch tubes produced within 6 weeks. Rabbit Ears’ Pass, Routt County, Colorado. September 3, 2007
5303007 red turpentine beetle Dendroctonus valens
5303006 red turpentine beetle Dendroctonus valens
1475011 banded elm bark beetle Scolytus schevyrewi adults and associated twig feeding
1475010 banded elm bark beetle Scolytus schevyrewi adults and associated twig feeding
5082087 mountain pine beetle Dendroctonus ponderosae dead adult in pitch out produced in tree defense
5082085 mountain pine beetle Dendroctonus ponderosae pitch out that successfully killed adult attempting to tunnel
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.
5024090 walnut twig beetle Pityophthorus juglandis Larvae associate with area of Fusarium infection on trunk.
5024088 walnut twig beetle Pityophthorus juglandis Extension larval tunnel in trunk area associated with Fusarium sp. infection.
1455160 blue spruce engraver Ips hunteri Adults on penny
1455147 smaller European elm bark beetle Scolytus multistriatus
1326205 banded elm bark beetle Scolytus schevyrewi Newly introduced species in western US. Found on Elm, caragana, and Russian olive.
1326206 banded elm bark beetle Scolytus schevyrewi Newly introduced species in western US. Found on Elm, caragana, and Russian olive.

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