USDA Forest Service:
1916. Larvae in galls formed on foliage of Libocedrus. Ashland, Oregon.
USDA Forest Service:
1915. Adult Megastigmus spermatrophus ovipositing in Douglas-fir cone. Ashland, Oregon.
Internet Archive Book Images:
Image from page 577 of "Bulletin of the Museum of Comparative Zoology at Harvard College" (1973)
USDA Forest Service:
c.1960. Normal ponderosa pine cone cut to show seeds. Plateau Block, J. Neils Co. Glenwood, Washington.
USDA Forest Service:
1958. Stearman spray plane. Spruce budworm control project. Sumpter, Oregon.
Internet Archive Book Images:
Image from page 63 of "The publications of the Pennsylvania chestnut tree blight commission, 1911-1913" (1915)
USDA Forest Service:
1955. Ford tri-motor spraying DDT. Western spruce budworm control project. Powder River control unit, Oregon.
USDA Forest Service:
1952. East face of Mary's Peak. Light trees were beetle killed. The beetles bred in 1949-1950 blowdown. Benton County, OR.
USDA Forest Service:
1949. B-18 spraying on western spruce budworm project. Mt. Hood area, Oregon.
USDA Forest Service:
1935. The ponderous borer. Cerambycidae. Ergates spiculatus larvae.
Internet Archive Book Images:
Image from page 454 of "Veitch's manual of the coniferae : containing a general review of the order, a synopsis of the species cultivated in Great Britain, their botanical history, economic properties, place and use in arboriculture, etc" (1900)
USDA Forest Service:
1924. Braconid parasites on dead Coloradia pandora (Pandora moth) larva.
USDA Forest Service:
c.1924. Coloradia pandora (Pandora moth).
USDA Forest Service:
1921. Portion of the forest untouched by storm of January 29, 1921. Olympic National Forest, Washington.
USDA Forest Service:
1921. The monarch of the forest laid low in serried ranks. It is estimated that 8 billion board feet of timber was wind thrown in this manner by the cyclone. Olympic National Forest, Washington.
USDA Forest Service:
1921. Olympic National Forest blowdown showing portion of the wind thrown timber. Olympic National Forest, Washington.
USDA Forest Service:
1916. Ptinidae larvae. Pinus jeffreyi cone.
USDA Forest Service:
1916. Hymenotera. Callimomidae. Megastigmus albifrons. Pinus ponderosa. Hymenoptera development. Ashland, Oregon.
USDA Forest Service:
1915. Hymenoptera. Cynipidae. Cynipid sp. Gall insects in Quercus sp. - white oak.
USDA Forest Service:
1914. Hymenoptera. Callimomidae. Megastigmus pinus. Pupae and adults. Ashland, Oregon.
USDA Forest Service:
c.1915. In F.P. Keen's Cone and Seed Insects of Western Forest Trees (USDA Technical Bulletin 1169), this image is Figure 52 on page 149. The caption reads, "Adults of the fir coneworm Dioryctria abietella."
Internet Archive Book Images:
Image from page 14 of "The decay of timber and methods of preventing it" (1902)
Internet Archive Book Images:
Image from page 16 of "The decay of timber and methods of preventing it" (1902)
Internet Archive Book Images:
Image from page 22 of "The decay of timber and methods of preventing it" (1902)
Internet Archive Book Images:
Image from page 678 of "Comptes rendus hebdomadaires des séances de l'Académie des sciences" (1898)
Internet Archive Book Images:
Image from page 738 of "Comptes rendus hebdomadaires des séances de l'Académie des sciences" (1911)
Internet Archive Book Images:
Image from page 564 of "Comptes rendus hebdomadaires des séances de l'Académie des sciences" (1906)
Internet Archive Book Images:
Image from page 708 of "Bulletin international de l'Académie des Sciences de Cracovie. Classe des sciences mathématiques et naturelles. = Anzeiger der Akadémie der Wissenschaften in Krakau. Mathematisch-naturwissenschaftliche classe" (1902)
Internet Archive Book Images:
Image from page 708 of "Bulletin international de l'Académie des Sciences de Cracovie. Classe des sciences mathématiques et naturelles. = Anzeiger der Akadémie der Wissenschaften in Krakau. Mathematisch-naturwissenschaftliche classe" (1902)
Internet Archive Book Images:
Image from page 732 of "Bulletin international de l'Académie des Sciences de Cracovie. Classe des sciences mathématiques et naturelles. = Anzeiger der Akadémie der Wissenschaften in Krakau. Mathematisch-naturwissenschaftliche classe" (1904)
