1966. Harvey Holt (OSU grad. student) injecting Cacodylic Acid into beetle infested tree. Deschutes National Forest, Oregon.

Harvey Holt (OSU grad. student) injecting Cacodylic Acid into beetle infested tree. Deschutes National Forest, Oregon.

 

Note: "Cacodylic acid (dimethylarsenic acid), an herbicide, has shown promise in several recent experiments as a chemical control for bark beetles. ...

Introduced into the sap stream of a tree, cacodylic acid either kills the beetles outright, makes the environment unsuitable for them, or both. Acid-treated green trees are attractive to beetles under certain conhttps://www.flickr.com/photos/151887236@N05/45815075092/in/dateposted-public/ditions, and this characteristic has been used in attempts to reduce beetle populations by setting up fatal "attractant centers." Postflight applications, in which newly infestes trees are treated, have also been tried."

For more see: J.F. Chasler, D.B. Cahill, and R.E. Stevens. Cacodylic Acid Field Tested For Control of Mountain Pine Beetles in Ponderosa Pine. 1970. Research Note RM-161. Rocky Mountain Forest and Range Experiment Station.

 

Photo by: Robert E. Dolph

Date: March 1966

 

Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.

Source: Division of Timber Management, Insect and Disease Control Branch Collection; Regional Office, Portland, Oregon.

Image: ID-492

 

Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth

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