File:1924. Marking a group of infested ponderosa pine. The spotter has blazed 21 trees recently attacked by bark beetles in a heavy center of infestation. Kaibab National Forest, Arizona. (26445233419).jpg
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Original file (1,448 × 1,073 pixels, file size: 363 KB, MIME type: image/jpeg)
Categories:
- Diseases and disorders of plants due to insects
- United States Forest Service Pacific Northwest Region
- Pinus ponderosa (historical images)
- Pinus ponderosa forest management
- Flora of Kaibab National Forest
- Black and white photographs of the United States in the 1920s
- Fires in Kaibab National Forest
- 20th-century black and white photographs of Arizona
- 1924 in Arizona