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Effect of Physiological Status and Growth of Ponderosa Pine (Pinus ponderosa) and Greenleaf Manzanita (Arctostaphylos patula) on Herbicide Selectivity

Published online by Cambridge University Press:  12 June 2017

Sandra M. Paley  and
Steven R. Radosevich
Sandra M. Paley
Affiliation:
Univ. of California, Davis, CA 95616
Steven R. Radosevich
Affiliation:
Univ. of California, Davis, CA 95616
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Abstract

Correlations between herbicide damage and several physiological factors were examined in the field for ponderosa pine (Pinus ponderosa Dougl. ex P&C Lawson) and greenleaf manzanita (Arctostaphylos patula Greene). Pine injury caused by 2,4-D [(2,4-dichlorophenoxy) acetic acid], glyphosate [N-(phosphonomethyl) glycine], or triclopyr {[(3,5,6-trichloro-2-pyridinyl)oxy] acetic acid]} was compared to leader growth rate, needle growth rate, predawn xylem potential, daytime xylem potential, and photo synthetic rate occurring on the dates of herbicide application. Shrub injury for each of the three herbicides was compared to predawn xylem potential, daytime xylem potential, and photo synthetic rates. Both species exhibited less injury from herbicide applications made at the end of September than from any applications made from April through October. Comparison of factors highly correlated to herbicide damage indicates that highest herbicide selectivity occurs when pine has ceased growing, the xylem potential of the pine is relatively low (high water stress), and the xylem potential of the manzanita is relatively high.

Keywords

Pinus ponderosaArctostaphylos patulaplant water potentialgross photosynthesis
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 32 , Issue 3 , May 1984 , pp. 395 - 402
Copyright
Copyright © 1984 by the Weed Science Society of America 

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