1 July 2012 Response of Ragweed Parthenium (Parthenium hysterophorus) to Saflufenacil and Glyphosate
Dennis C. Odero
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Field and greenhouse studies were conducted in Belle Glade, FL, in 2010 and 2011 to evaluate saflufenacil and glyphosate efficacy on POST burndown of ragweed parthenium. Log-logistic models were used to determine the herbicide dose required to produce 90% control (ED90). The ED90 for rosette ragweed parthenium control in the greenhouse was saflufenacil at 8.0 g ai ha−1 at 14 d after treatment. The rate required to cause 90% growth reduction of rosette ragweed parthenium at 14 d after treatment was 8.9 g ha−1 of saflufenacil. The probability of rosette ragweed parthenium survival decreased with increasing rates of saflufenacil. The ED90 value for bolted ragweed parthenium control in the field was 5.7 g ha−1 of saflufenacil at 21 d after treatment. Ragweed parthenium had no response to glyphosate either in the field or in the greenhouse studies. This demonstrates that saflufenacil can be used as a POST burndown of ragweed parthenium populations that have no response to glyphosate.

Nomenclature: Glyphosate; saflufenacil; ragweed parthenium, Parthenium hysterophorus L.

Weed Science Society of America
Dennis C. Odero "Response of Ragweed Parthenium (Parthenium hysterophorus) to Saflufenacil and Glyphosate," Weed Technology 26(3), 443-448, (1 July 2012). https://doi.org/10.1614/WT-D-11-00116.1
Received: 25 August 2011; Accepted: 1 February 2012; Published: 1 July 2012
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