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Differential Response of Hemp Dogbane (Apocynum cannabinum) to Clopyralid, Dowco 433, and 2,4-D

Published online by Cambridge University Press:  12 June 2017

Michael S. Orfanedes  and
Loyd M. Wax
Michael S. Orfanedes
Affiliation:
Dept. Agron., Univ. Ill., Urbana, IL 61801
Loyd M. Wax
Affiliation:
Dept. Agron., Univ. Ill., Urbana, IL 61801
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Abstract

Field studies were conducted to compare the short- and long-term control of hemp dogbane by POST applications of Dowco 433, clopyralid, and 2,4-D amine. Dowco 433 at 140 g ae ha–1 controlled 81 to 93% of weeds at 8 wk after treatment. Good control (79 to 89%) was also achieved with 560 g ae ha–1 2,4-D amine at 8 wk after treatment. Twelve months after treatment, control of hemp dogbane averaged 65 to 75% where Dowco 433 was applied at rates of 140 g ha–1 or higher. Similar results were obtained with 2,4-D amine at 560 g ha–1. Control with clopyralid was minimal. Weed height and dry weight were reduced with all treatments except clopyralid. The effect of early versus late application was also evaluated in two studies. In certain situations, control 8 wk after treatment was greater when application was made during the early reproductive growth stage as opposed to the vegetative growth stage.

Keywords

Clopyralid, 3,6-dichloro-2-pyridinecarboxylic acidDowco 433, 4-amino-3,5-dichloro-6-fluoro-2-pyridyloxyacetic acid2,4-D amine, dimethylamine salt of (2,4-dichlorophenoxy)acetic acidhemp dogbane (Apocynum cannabinum L. ♯ APCCAApplication timingperennial weed control2,4-DAPCCA
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 782 - 788
Copyright
Copyright © 1990 by the Weed Science Society of America 

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