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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."
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51 Images of 24 Subjects View Subject List View Image Details View Thumbnails

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Image Subject Name Scientific Name Description
5492726 ash flower gall mite Eriophyes fraxiniflora Ash flower galls on black ash, late winter.
5492727 ash flower gall mite Eriophyes fraxiniflora Ash flwower galls scattered in the crowns of black ash trees.
1484011 oak bullet gall Disholcaspis quercusglobulus galls
1398069 acorn-plum gall Amphibolips quercusjuglans galls
1457017 oak bullet gall Disholcaspis quercusglobulus Bullet galls formed on the twigs of a young white oak. Also found on neighboring burr oak. Galls secrete a honeydew substance that attracts insects such as wasps, bees and flies.
1398253 poplar twiggall fly Hexomyza schineri Twig galls
1470187 ash flower gall mite Eriophyes fraxiniflora
2251075 hackberry nipplegall maker Pachypsylla celtidismamma
0805050 pineapple gall midges Rabdophaga spp. gall on willow
0355010 petiolegall psyllid Pachypsylla venusta on oak
3056042 large oak-apple gall Amphibolips confluenta gall on oak
3066041 oak phylloxerids Phylloxera spp. new shoots in Nuttall oak seedlings killed
1470114 horned oak gall Callirhytis cornigera
3046006 psyllids
3057077 locust twig borer Ecdytolopha insiticiana in gallery in branch
3066040 oak phylloxerids Phylloxera spp. new shoots on Nuttall oak seedlings killed
0284082 locust twig borer Ecdytolopha insiticiana gallery and entrance hole
3057090 gallmaking maple borer Xylotrechus aceris adult exit hole over attack site
1396083 horned oak gall Callirhytis cornigera Shawnee National Forest
0976061 poplar petiolegall aphid Pemphigus populitransversus large gall at Salida Ranger District
3056041 large oak-apple gall Amphibolips confluenta gall (at right) on Nuttall oak
3067030 ash flower gall mite Eriophyes fraxiniflora
3057020 gall midges infested leaves rolled and curled
3057089 gallmaking maple borer Xylotrechus aceris
1398081 oak apple gall Amphibolips spp. developing gall.
5424270 oak apple gall Amphibolips spp. Two galls, one with a exit hole. 
5424271 oak apple gall Amphibolips spp. Two galls, one with an exit hole.
5424272 oak apple gall Amphibolips spp. Two galls, one with an exit hole
1396078 Cynipid gall wasp Andricus ignotus gall on oak; agamic generation
0488065 pip gall wasp Callirhytis operator to acorn
5042096 maple bladdergall mite Vasates quadripedes
5042097 maple bladdergall mite Vasates quadripedes
5202097 ash flower gall mite Eriophyes fraxiniflora Distorted staminate flowers on ash, early season; Infested flowers turn dark brown to black and persist through the winter.
5202098 ash flower gall mite Eriophyes fraxiniflora
5203022 hackberry nipplegall maker Pachypsylla celtidismamma Galls caused by the hackberry nipple gall maker on the underside of a hackberry leaf; Photo taken in Ramsey Co., MN
5203023 hackberry nipplegall maker Pachypsylla celtidismamma galls caused by the hackberry nipple gall maker on the underside of a hackberry leaf; Photo taken in Ramsey Co., MN
5203024 hackberry nipplegall maker Pachypsylla celtidismamma Single gall
1470186 ash flower gall mite Eriophyes fraxiniflora
1470113 horned oak gall Callirhytis cornigera
1470055 ash flower gall mite Eriophyes fraxiniflora
1398056 ocellate gall midge Acericecis ocellaris Eyespot galls.
1398068 acorn-plum gall Amphibolips quercusjuglans Two plum galls formed on the outside of an acorn cup, photo taken in Sawyer Co., WI.
1396082 horned oak gall Callirhytis cornigera
1394021 poplar vagabond aphid Mordvilkoja vagabunda
1394022 poplar vagabond aphid Mordvilkoja vagabunda
3066038 oak phylloxerids Phylloxera spp. leaves curled and deformed on Nuttall oak
3066032 sugarberry psyllid Tetragonocephela flava decline leaf curl
3057078 locust twig borer Ecdytolopha insiticiana to stem (note twig swelling and entrance openings)
1748009 pine and spruce adelgids Pineus spp.
0488064 stony gall Callirhytis fructuosa cross section of gall in acorn
0355011 locust twig borer Ecdytolopha insiticiana on locust

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