USDA Forest Service:
1916. Mt. Hood from Timbered Park. Mt. Hood National Forest, Oregon.
USDA Forest Service:
1937. Galls caused by balsam woolly aphid (Chermes picea; balsam woolly adelgid; Adelges piceae) on lowland white fir. Notice three years' buds have suffered similar injury. Senator Charles L. McNary's farm, Salem, Oregon.
USDA Forest Service:
1937. Twig nodule galls caused by balsam woolly aphid (Chermes piceae; balsam woolly adelgid; Adelges piceae) on lowland white fir. Senator Charles L. McNary's farm, Salem, Oregon.
USDA Forest Service:
1942. Balsam woolly adelgid (Chermes piceae; Adelges piceae). Detail of bark surface showing egg masses and wax-covered females on Abies grandis. Sample from Wilsonville, Oregon.
USDA Forest Service:
1942. Balsam woolly adelgid (Chermes piceae; Adelges piceae). Detail of bark surface showing egg masses and wax-covered females on Abies grandis. Sample from Wilsonville, Oregon.
USDA Forest Service:
1942. Balsam woolly adelgid (Chermes piceae). Detail of bark surface showing egg masses and wax-covered females on Abies grandis. Sample from Wilsonville, Oregon.
USDA Forest Service:
1942. Balsam woolly adelgid (Chermes piceae; Adelges piceae). Upper surface of limb showing characteristics of heavy attack on Abies grandis. Sample from Wilsonville, Oregon.
USDA Forest Service:
1942. Balsam woolly adelgid (Chermes piceae). Lower surface of limb showing characteristics of heavy attack on Abies grandis. Sample from Wilsonville, Oregon.
USDA Forest Service:
1942. Balsam woolly adelgid (Chermes piceae). Lower surface of limb showing characteristics of heavy attack on Abies grandis. Sample from Wilsonville, Oregon.
USDA Forest Service:
1942. Balsam woolly adelgid (Chermes piceae). Upper surface of limb showing characteristics of heavy attack on Abies grandis. Sample from Wilsonville, Oregon.
USDA Forest Service:
1955. Balsam woolly adelgid (Chermes sp.) woolly exudation on subalpine fir (Abies lasiocarpa). Government Camp, Oregon.
USDA Forest Service:
1955. Young larvae of balsam woolly adelgid (Chermes sp.) from Pacific silver fir. Note stylets used by insect to feed from cambium. Toutle River, Washington.
USDA Forest Service:
1955. Adult, eggs, and "wool" of balsam woolly adelgid (Chermes sp.) on Pacific silver fir (Abies amabilis). Mt. St. Helens, Washington.
USDA Forest Service:
1955. Adult (A), eggs (E), and woolly exudation (C) of balsam woolly adelgid (Chermes sp.) on Pacific silver fir. Toutle River, Washington.
USDA Forest Service:
1955. Balsam woolly adelgid on Pacific silver fir. Note wool secreting from dorsal side of adult. Mt. St. Helens, Washington.
USDA Forest Service:
1956. Stand of predominantly Pacific silver fir suffering heavy mortality from balsam woolly adelgid. Deer Creek, Toutle River, Washington.
USDA Forest Service:
1956. Stand of predominantly Pacific silver fir suffering heavy mortality from balsam woolly adelgid. Deer Creek, Toutle River, Washington.
USDA Forest Service:
1956. Number 1 of a 4-photo sequence test to determine best filters for photographing balsam woolly adelgid damage. Orange filter. Pine Creek. Gifford Pinchot National Forest, Washington.
USDA Forest Service:
1956. Number 2 of a 4-photo sequence test to determine best filters for photographing balsam woolly adelgid damage. Red (A) filter. Pine Creek. Gifford Pinchot National Forest, Washington.
USDA Forest Service:
1956. Number 3 of a 4-photo sequence test to determine best filters for photographing balsam woolly adelgid damage. Green filter. Pine Creek. Gifford Pinchot National Forest, Washington.
USDA Forest Service:
1956. Number 4 of a 4-photo sequence test to determine best filters for photographing balsam woolly adelgid damage. No filter. Pine Creek. Gifford Pinchot National Forest, Washington.
USDA Forest Service:
1956. Number 2 of a 3 photo sequence of tree killed by balsam woolly aphid. (G) filter. Pine Creek. Gifford Pinchot National Forest, Washington.
USDA Forest Service:
1957. Salvage logging Chermes-killed and damaged silver fir. Black Rock, Oregon.
USDA Forest Service:
1957. Salvage logging Chermes-killed and damaged silver fir. Black Rock, Oregon.
USDA Forest Service:
1957. Balsam woolly adelgid damage. Salvage logging heavily damaged stand of Pacific silver fir. Black Rock, Oregon.
USDA Forest Service:
1957. Balsam woolly adelgid damage. Salvage logging heavily damaged stand of Pacific silver fir. Black Rock, Oregon.
USDA Forest Service:
1957. Drawing by N.E. Johnson shows the life stages and feeding methods of the balsam woolly adelgid - Chermes piceae (Ratz.).
USDA Forest Service:
1957. Shipping box in which 10,000 Aphidoletes thompsoni: Mohn (Diptera: Cecidomyiidae), a predator of Chermes were received from Slovakia, Europe. Sellwood Lab. Portland, Oregon.
USDA Forest Service:
1957. Robert B. Pope with equipment used for macro-photography of Chermes and other subjects. Portland, Oregon.
USDA Forest Service:
1957. Aphidoletes thompsoni Mohn. Male adult of balsam woolly adelgid predator introduced from Slovakia. Sellwood Lab. Portland, Oregon.
