1934. Three relative degrees of Dendroctonus brevicomis attack; heavy, medium, and light on ponderosa pine. (39817485915)

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Description: Three relative degrees of Dendroctonus brevicomis attack; heavy, medium, and light on ponderosa pine. Photo by: K.A. Salman Date: March 19, 1934 Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Source: Bureau of Entomology Collection; La Grande, Oregon. Image: BUR-8572 For additional historical forest entomology photos, stories, and resources see the Western Forest Insect Work Conference site: wfiwc.org/content/history-and-resources Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth Public domainPublic domainfalsefalse. : This image or file is a work of a United States Department of Agriculture employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain. English | español | 日本語 | македонски | Nederlands | русский | slovenščina | українська | +/− :. Date: 19 March 1934, 11:11. Source: 1934. Three relative degrees of Dendroctonus brevicomis attack; heavy, medium, and light on ponderosa pine.. Author: R6, State & Private Forestry, Forest Health Protection.