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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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Image Subject Name Scientific Name Description
5485677 hemlock woolly adelgid Adelges tsugae Hemlock mortality caused by Hemlock Woolly Adelgid (Adelges tsugae). 
1593004 cooley spruce gall adelgid Adelges cooleyi Wool-covered adelgids on their alternate host, Douglas-fir. 
1593055 eastern spruce gall adelgid Adelges abietis Older galls
1593005 eastern spruce gall adelgid Adelges abietis Odler galls caused by eastern spruce gall adelgid
1593049 pine bark adelgid Pineus strobi Main stem coated with cottony-like pine bark adelgids.
0795072 balsam woolly adelgid Adelges piceae crawler
1748047 hemlock woolly adelgid Adelges tsugae
1748046 hemlock woolly adelgid Adelges tsugae
2254012 cooley spruce gall adelgid Adelges cooleyi mass
2254013 cooley spruce gall adelgid Adelges cooleyi aphid mass covered with white waxy coating,
2253068 balsam woolly adelgid Adelges piceae note white appearance on tree bole
2252063 cooley spruce gall adelgid Adelges cooleyi on young douglas fir
0805052 spruce gall aphids Adelges spp. on spruce
1398221 pine bark adelgid Pineus strobi White coated bark on a pole-sized white pine. Waushara County, WI
1748049 hemlock woolly adelgid Adelges tsugae
0805051 spruce gall aphids Adelges spp. galls on white spruce
1199030 pine bark adelgid Pineus strobi
1199029 pine bark adelgid Pineus strobi Pine bark adelgid infestation on the bark of an eastern white pine
0488057 spruce gall adelgid Pineus similis on spruce
1468270 balsam woolly adelgid Adelges piceae
1398224 pine bark adelgid Pineus strobi Whitewashed appearance on a heavily infested stem. Waushara County, Wisconsin
1398223 pine bark adelgid Pineus strobi White cottony masses on the bark
1276003 hemlock woolly adelgid Adelges tsugae With wax removed
0795076 balsam woolly adelgid Adelges piceae
1276001 hemlock woolly adelgid Adelges tsugae Ovisacs on the underside of a branch
1587167 cooley spruce gall adelgid Adelges cooleyi
0488049 balsam woolly adelgid Adelges piceae
1748037 balsam woolly adelgid Adelges piceae
0795084 pine bark adelgid Pineus strobi on white pine
2253069 balsam woolly adelgid Adelges piceae note characteristic white of tree bole
1396092 pine bark adelgid Pineus strobi
0590100 balsam woolly adelgid Adelges piceae stand mortality at Mt. Mitchell
0590098 balsam woolly adelgid Adelges piceae stand mortality at Mt. Mitchell
1587070 balsam woolly adelgid Adelges piceae Balsam woolly adelgid on subalpine fir, infestation and mortality at edge of avalanche chute
1587068 balsam woolly adelgid Adelges piceae
1587075 balsam woolly adelgid Adelges piceae abnormal crown
1587074 balsam woolly adelgid Adelges piceae abnormal crown
1587073 balsam woolly adelgid Adelges piceae abnormal crown
1587072 balsam woolly adelgid Adelges piceae abnormal crown
1587165 hemlock woolly adelgid Adelges tsugae Hemlock woolly adelgids on containerized western hemlock seed orchard in greenhouse
1587083 spruce gall aphids Adelges spp.
0355015 hemlock woolly adelgid Adelges tsugae
2253020 balsam woolly adelgid Adelges piceae
1748036 balsam woolly adelgid Adelges piceae
1748043 balsam woolly adelgid Adelges piceae
1520081 hemlock woolly adelgid Adelges tsugae
1520082 hemlock woolly adelgid Adelges tsugae
1520083 hemlock woolly adelgid Adelges tsugae HWA on hemlock needles
1520084 hemlock woolly adelgid Adelges tsugae HWA on hemlock needles
1510086 balsam woolly adelgid Adelges piceae Balsam wooly adelgid caused mortality
1510053 balsam woolly adelgid Adelges piceae Balsam wooly adelgid infested fir bole
1510050 balsam woolly adelgid Adelges piceae Balsam wooly adelgid killed frazier fir
1510051 balsam woolly adelgid Adelges piceae Gouting of Frasier fir from balsam wooly adelgid
0355019 spruce gall aphids Adelges spp. thinning crowns
2254044 cooley spruce gall adelgid Adelges cooleyi
3036038 balsam woolly adelgid Adelges piceae Parking lot at Mt. Mitchel from visitor tower
5050024 cooley spruce gall adelgid Adelges cooleyi
5050025 cooley spruce gall adelgid Adelges cooleyi
5050026 cooley spruce gall adelgid Adelges cooleyi
5050027 cooley spruce gall adelgid Adelges cooleyi
1468263 cooley spruce gall adelgid Adelges cooleyi
1396093 pine bark adelgid Pineus strobi
1396091 pine bark adelgid Pineus strobi
1394077 pine leaf adelgid Pineus pinifoliae
1276002 hemlock woolly adelgid Adelges tsugae Adult and eggs inside an ovisac
1276004 hemlock woolly adelgid Adelges tsugae Recently infested
1276005 hemlock woolly adelgid Adelges tsugae Tree removal
1748044 balsam woolly adelgid Adelges piceae
1748041 balsam woolly adelgid Adelges piceae
1748042 balsam woolly adelgid Adelges piceae
1748040 balsam woolly adelgid Adelges piceae
1748039 balsam woolly adelgid Adelges piceae
1510011 hemlock woolly adelgid Adelges tsugae closeup
0795074 balsam woolly adelgid Adelges piceae on Richland balsam at Mt. Mitchell
1441103 spruce gall aphids Adelges spp. laid by overwintering female on needle
0590099 balsam woolly adelgid Adelges piceae stand mortality at Mt. Mitchell
0364001 balsam woolly adelgid Adelges piceae stand mortality at Mt. Mitchell
2252066 balsam woolly adelgid Adelges piceae close-up
2254052 balsam woolly adelgid Adelges piceae on subalpine fir
2254041 cooley spruce gall adelgid Adelges cooleyi galls on spruce
1748038 balsam woolly adelgid Adelges piceae
1748045 hemlock woolly adelgid Adelges tsugae
1748048 hemlock woolly adelgid Adelges tsugae thinning of crown
1748009 pine and spruce adelgids Pineus spp.
1678065 cooley spruce gall adelgid Adelges cooleyi gall on engelmann spruce
1678062 balsam woolly adelgid Adelges piceae gouting damage
0488085 pine bark adelgid Pineus strobi
0488086 pine bark adelgid Pineus strobi to white pine
0488055 hemlock woolly adelgid Adelges tsugae

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