Pacific Southwest

Title: Recovery of young ponderosa pines damaged by herbicide spraying

Author: Bentley, Jay R.; Blakeman, David A.; Carpenter, Stanley B.

Date: 1971

Source: Res. Note PSW-RN-252. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 8 p

Station ID: RN-PSW-252

Description: Foliage injury and over-all tree damage to ponderosa pine plantations from aerial sprays of 2,4,5-T in 1965 were evaluated. Damage in 1966 was compared to tree growth from 1966 to 1968. The herbicide treatment caused above-normal damage to young trees when applied in September in a year with above-average summer precipitation and freezing weather soon after treatment. In the second year after spraying, the damaged pines improved greatly in vigor and appearance. And by the third year, their height growth was about the same as the undamaged trees. Recovery was more complete and control of competing brush was more effective in young plantations than in older ones.

Keywords: Pinus ponderosa; plantation stands; forest weed control; 2,4,5-T; herbicide damage; leaf damage; weather factors; recovery ratio

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Citation

Bentley, Jay R.; Blakeman, David A.; Carpenter, Stanley B.  1971.  Recovery of young ponderosa pines damaged by herbicide spraying.   Res. Note PSW-RN-252. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 8 p.