USDA Forest Service:
1934. Drawing by de Young shows the life stages of the western hemlock looper, Ellopia fiscellaria var. Lugubrosa Hulst.
USDA Forest Service:
1930. Hemlock killed on the Nehalem River by old outbreaks of hemlock looper. Oregon.
USDA Forest Service:
1930. Hemlock killed on the Nehalem River by old outbreaks of western hemlock looper. Oregon.
USDA Forest Service:
1930. Hemlock killed on the Nehalem River by old outbreaks of western hemlock looper. Oregon.
USDA Forest Service:
1931. Hemlock looper control project. Naselle area, Washington.
USDA Forest Service:
1931. Wesley Grey and mechanic. Hemlock looper control project. Pacific and Grays Harbor Counties, WA.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, WA.
USDA Forest Service:
1931. Naselle area, showing hemlock looper infested timber lands. Western hemlock looper dusting project. Washington.
USDA Forest Service:
1931. Naselle area, showing hemlock looper infested timber lands. Western hemlock looper dusting project. Washington.
USDA Forest Service:
1931. Airplane dusting on Naselle area for forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting on Naselle area for forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Two airplanes dusting on Naselle area for forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Scene on Naselle showing areas infested with western hemlock looper. Washington.
USDA Forest Service:
1931. Aerial scene on Naselle showing areas infested with western hemlock looper. Washington.
USDA Forest Service:
1932. Ground cage used to trap hemlock looper parasites. Montesano, Washington.
USDA Forest Service:
1932. Ground cage used to trap hemlock looper parasites. Montesano, Washington.
USDA Forest Service:
1932. Hemlock looper cages.
USDA Forest Service:
1932. Ground cage for collecting hemlock looper parasites. Naselle, Washington.
USDA Forest Service:
1932. Muslin frame 10 feet square, for collecting hemlock looper droppings. Montesano, Washington.
USDA Forest Service:
1932. Hemlock-spruce stands in Grays Harbor County, Washington.
USDA Forest Service:
1932. Young even-aged hemlock stand. Grays Harbor County, Washington.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 8. Figure 3. Map of Major Projects 1938-1939. Forest Insect Laboratory, Portland, Oregon.
USDA Forest Service:
1945. Hemlock looper adult male. Lambdina fiscellaria lugubrose.
USDA Forest Service:
1945. Understory conditions on hemlock looper control area. Clatsop County, Oregon.
