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Notes: Transpiration Reduction of Shrub Live Oak by Picloram

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Transpiration-retardant properties of picloram (4-amino-3,5,6-trichloropicolinic acid) were evaluated for utility in water conservation projects in the chaparral vegetation type. A subirrigation volumetric technique with potted plants was used to investigate the effects of sequentially applied foliage sprays on shrub live oak (Quercus turbinella). The treatments proceeded from low-dosage and low-volume sprays to high-volume sprays in which the soil was shielded to prevent root uptake. A single spray of 0.56 kg/ha in 93.5 liters (0.5 lb/A in 10 gal) temporarily reduced transpiration approximately 20 percent, without visible leaf injury. Two additional treatments at the same dosage reduced initial transpiration 36 percent and caused 13 percent leaf injury. A fourth treatment of 2.24 kg/ha in 374 liters (2 lb/A in 40 gad reduced initial transpiration 51 percent accompanied by 27 percent leaf injury. A final wetting spray with the same mixture caused rapid and complete reduction in transpiration, but killed all leaves. The antitranspirant effect of picloram at sublethal dosages on shrub live oak is too slight to be hydrologically significant. Forest Sci. 24:217-221.
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Keywords: Antitranspirant; Quercus turbinella; brush control; chaparral; water yield improvement

Document Type: Miscellaneous

Affiliations: Plant Physiologist at the Forestry Sciences Laboratory, Rocky Mountain Forest and Range Experiment Station, USDA Forest Service, Tempe, Arizona 85281, in cooperation with Arizona State University

Publication date: 1978-06-01

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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