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Using the Rosette Technique for Canada Thistle (Cirsium arvense) Control in Row Crops

Published online by Cambridge University Press:  12 June 2017

Brett R. Miller  and
Rodney G. Lym
Brett R. Miller
Affiliation:
Plant Science Department, North Dakota State University, Fargo, ND 58105
Rodney G. Lym
Affiliation:
Plant Science Department, North Dakota State University, Fargo, ND 58105
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Abstract

Clopyralid applied to Canada thistle rosettes has provided better control in the following growing season than applications to bolted plants. The objectives of this research were to determine if using cultivation to prevent plants from bolting prior to herbicide application (the rosette technique) could be successfully incorporated into a row crop production system and to evaluate the effect of Canada thistle growth stage on the absorption and translocation of 14C-clopyralid. Canada thistle control 8 mo after postharvest herbicide treatment (MAFT) using the rosette technique was similar to control when using conventional in-crop plus postharvest herbicide treatments in corn and soybean. Glyphosate and clopyralid plus 2,4-D were the most consistent postharvest herbicide treatments for Canada thistle control 8 MAFT in corn and soybean. Corn yields were similar, but soybean yields were slightly lower when Canada thistle was controlled using cultivation compared to conventional herbicide treatments. 14C-clopyralid translocation to Canada thistle roots and lower shoot parts was greater when clopyralid was applied to the rosette stage than when applied to bolted Canada thistle plants. The increased translocation probably accounts for the increased Canada thistle control observed in the field. Incorporating the rosette technique into a weed management program should allow growers to control Canada thistle with less herbicide input than do standard practices.

Keywords

Glyphosate, N-(phosphonomethyl)glycine2,4-D, (2,4-dichlorophenoxy)acetic acidclopyralid, 3,6-dichloro-2-pyridinecarboxylic acidCanada thistle, Cirsium arvense (L.) Scop. # CIRARcorn, Zea mays L.soybean, Glycine max (L.) Merr.Absorptionboltednoxious weedperennial weedtranslocationDAT, days after in-crop treatmentMAFT, months after postharvest treatmentHAT, hours after treatment
Type
Research
Information
Weed Technology , Volume 12 , Issue 4 , December 1998 , pp. 699 - 706
Copyright
Copyright © 1998 by the Weed Science Society of America 

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References

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