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Characterization and management of glyphosate-resistant giant ragweed (Ambrosia trifida L.) and horseweed [Conyza canadensis (L.) cronq.].

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterization and management of glyphosate-resistant giant ragweed (Ambrosia trifida L.) and horseweed [Conyza canadensis (L.) cronq.]./
Author:	Stachler, Jeff Michael.
Description:	124 p.
Notes:	Adviser: Mark M. Loux.
Contained By:	Dissertation Abstracts International69-07B.
Subject:	Agriculture, Agronomy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3321342
ISBN:	9780549725213

Characterization and management of glyphosate-resistant giant ragweed (Ambrosia trifida L.) and horseweed [Conyza canadensis (L.) cronq.].
Stachler, Jeff Michael.

Characterization and management of glyphosate-resistant giant ragweed (Ambrosia trifida L.) and horseweed [Conyza canadensis (L.) cronq.]. - 124 p.

Adviser: Mark M. Loux.

Thesis (Ph.D.)--The Ohio State University, 2008.

Horseweed and giant ragweed are becoming more difficult to control in glyphosate-resistant soybeans due to repeated use of herbicides with the same site of action, especially glyphosate and ALS-inhibiting herbicides. Greenhouse and field doseresponse studies were conducted to characterize response of giant ragweed and horseweed populations to glyphosate and the combination of glyphosate and cloransulam, respectively. Field studies were conducted to determine the most effective combination and timing of preplant herbicides for the control of multiple-resistant horseweed populations, and to determine whether glyphosate-based herbicide programs could effectively control glyphosate-resistant giant ragweed populations.

ISBN: 9780549725213Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Characterization and management of glyphosate-resistant giant ragweed (Ambrosia trifida L.) and horseweed [Conyza canadensis (L.) cronq.].
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100 1 $a Stachler, Jeff Michael. $3 1031128
245 1 0 $a Characterization and management of glyphosate-resistant giant ragweed (Ambrosia trifida L.) and horseweed [Conyza canadensis (L.) cronq.].
300 $a 124 p.
500 $a Adviser: Mark M. Loux.
500 $a Source: Dissertation Abstracts International, Volume: 69-07, Section: B, page: 3907.
502 $a Thesis (Ph.D.)--The Ohio State University, 2008.
520 $a Horseweed and giant ragweed are becoming more difficult to control in glyphosate-resistant soybeans due to repeated use of herbicides with the same site of action, especially glyphosate and ALS-inhibiting herbicides. Greenhouse and field doseresponse studies were conducted to characterize response of giant ragweed and horseweed populations to glyphosate and the combination of glyphosate and cloransulam, respectively. Field studies were conducted to determine the most effective combination and timing of preplant herbicides for the control of multiple-resistant horseweed populations, and to determine whether glyphosate-based herbicide programs could effectively control glyphosate-resistant giant ragweed populations.
520 $a The GR50 for a multiple-resistant horseweed population treated with cloransulam and glyphosate was 45 g ai/ha and 2120 g ae/ha, respectively. The level of resistance for this biotype was a factor of 31, compared to a sensitive population. In the field, horseweed survived the application of glyphosate plus cloransulam and glyphosate alone at rates up to four times the recommended rate. Combinations of paraquat, metribuzin, plus 2,4-D, and glyphosate (3360 g/ha) plus 2,4-D, controlled emerged multiple-resistant horseweed. The GR50 for glyphosate-resistant giant ragweed populations ranged from 8.3 to 23.9 kg/ha of glyphosate. The level of resistance for these populations ranged from a factor of 2.1 to 6.1, compared with a glyphosate-sensitive population. In the field, individual plants within the populations could survive single or multiple applications of glyphosate totaling 2.5 to 3.4 kg/ha. The majority of plants within each glyphosate-resistant giant ragweed population could be controlled when glyphosate (1.7 kg/ha) or fomesafen was applied postemergence, and followed with another application of glyphosate (0.84 kg/ha). Effective control required the preplant use of glyphosate and 2,4-D to control emerged plants, and cloransulam plus flumioxazin to provide partial residual control of later-emerging plants.
520 $a This research confirms the presence of low-level glyphosate resistance in giant ragweed, and multiple-resistance in horseweed, to glyphosate and ALS-inhibiting herbicides. This is the first confirmation of these resistant cases in the world. Resistant populations can be effectively managed where the herbicide program includes 2,4-D and residual herbicides, applied prior to soybean planting at the appropriate weed growth stage. For giant ragweed, the preplant herbicide treatment must be followed by multiple postemergence applications of glyphosate at maximum rates, or effective alternatives to glyphosate.
590 $a School code: 0168.
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Agriculture, Plant Culture. $3 1018669
690 $a 0285
690 $a 0479
710 2 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 69-07B.
790 $a 0168
790 1 0 $a Loux, Mark M., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3321342