Color infrared aerial photography for root disease detection in the Northern Region
By: by Ralph E. Williams.
Contributors: United States. Forest Service. Northern Region. State & Private Forestry.
Series: Report -- no. 73-22.; Report (United States. Forest Service. Northern Region) -- no. 73-22.
Publisher: U.S. Dept. of Agriculture, Forest Service, Division of State and Private Forestry, Northern Region
Published: 1973
Place of publication: Missoula, Mont
Language: eng
Subjects: Aerial photography in forestry -- Idaho -- Coeur d'Alene National Forest.; Roots (Botany) -- Diseases and pests -- Idaho -- Coeur d'Alene National Forest -- Remote sensing.
Description: "Holes" with dead, dying, and downed trees in the forest canopy could be reliably identified on 9- by 9-inch Kodak Ektachrome Infrared Aero film 2443 as root disease centers. Film scales larger than 1:4000 were best for detection of these "holes." Most commonly occurring causal organisms in root diseased trees were Armillaria mellea and Poria weirii. Although trees in latter stages of decline could be visually identified from photographs, red filter optical density measurements were extremely variable and inconclusive.
Notes: Caption title.

"September 1973."--Cover.

Includes bibliographical references (p. 6-7).

Also issued online.