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Chlormequat Chloride (CCC) Pretreatments May Enhance Quackgrass (Elytrigia repens) Control with Sethoxydim

Published online by Cambridge University Press:  12 June 2017

K. Neil Harker  and
John S. Taylor
K. Neil Harker
Affiliation:
Agric. Canada Res. Stn., Bag Service 5000, Lacombe, AB, Canada T0C 1S0
John S. Taylor
Affiliation:
Agric. Canada Res. Stn., Bag Service 5000, Lacombe, AB, Canada T0C 1S0
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Abstract

Laboratory, greenhouse, and field experiments were conducted at the Lacombe Research Station to determine if CCC, ethephon, or CCC/ethephon had direct activity on quackgrass rhizome buds, and to determine if foliar applications of CCC/ethephon could predispose quackgrass to more effective control with sethoxydim. CCC, ethephon, and CCC/ethephon had growth regulating effects on the axillary buds and the apex of detached quackgrass rhizomes. CCC increased rhizome bud sprouting on rhizomes with the apex excised, but not on rhizomes with an intact apex. Ethephon or CCC/ethephon inhibited bud sprouting on rhizomes with an intact or excised apex. CCC/ethephon, but not CCC or ethephon alone, increased rhizome elongation on rhizomes with intact apices. In the greenhouse, pretreatments of CCC/ethephon increased sethoxydim activity on quackgrass rhizome buds and caused lower shoot emergence from one-bud rhizome segments. Results of field experiments were less consistent than those in the greenhouse. However, sometimes CCC or CCC/ethephon pretreatments resulted in increased quackgrass control in the field with sethoxydim.

Keywords

Chlormequat chloride or CCC, (2-chloroethyl)trimethylammoniumchlorideethephon, (2-chloroethyl)phosphonic acidsethoxydim, {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one}quackgrass, (Elytrigia repens (L.) Nevski) # AGRREApical dominancebud dormancychlorocholine chlorideethephonherbicide efficiencyplant growth regulatorsrhizome budsAgropyron repensAGRRE
Type
Research
Information
Weed Technology , Volume 8 , Issue 3 , September 1994 , pp. 499 - 507
Copyright
Copyright © 1994 by the Weed Science Society of America 

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