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Herbicide Effectiveness in Response to Season of Application and Shrub Physiology

Published online by Cambridge University Press:  12 June 2017

W. Thomas Lanini  and
Steven R. Radosevich
W. Thomas Lanini
Affiliation:
Dep. Bot., Univ. of California, Davis, CA 95616
Steven R. Radosevich
Affiliation:
Dep. Bot., Univ. of California, Davis, CA 95616
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Abstract

The selectivity of five foliage-applied herbicides, 2,4-D [(2,4-dichlorophenoxy)acetic acid], dichlorprop [2-(2,4-dichlorophenoxy)propionic acid], glyphosate [N-(phosphonomethyl)glycine], fosamine [ethyl hydrogen (aminocarbonyl)phosphonate], and triclopyr {[(3,5,6-trichloro-2-pyridinyl)oxy] acetic acid}, applied at three phenological stages of development to five Sierran shrub species, deerbrush [Ceanothus integerrimus var. californicus (Kell.) G. T. Benson.], greenleaf manzanita (Arctostaphylos patula Greene), bearmat (Chamaebatia foliolosa Benth.), snowbrush ceanothus (Ceanothus velutinus Dougl.), and whiteleaf manzanita (Arctostaphylos viscida Parry), was compared. Treatments in the summer and fall were less effective than spring applications. Periods of herbicide susceptibility generally corresponded to times when moisture stress was low and photosynthesis was high.

Keywords

Photosynthesisxylem potentialmoisture stressphenology
Type
Research Article
Information
Weed Science , Volume 30 , Issue 5 , September 1982 , pp. 467 - 475
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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