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Response of Pinto and Small Red Mexican Bean to Postemergence Herbicides

Published online by Cambridge University Press:  20 January 2017

Nader Soltani ,
Robert E. Nurse ,
Darren E. Robinson  and
Peter H. Sikkema
Nader Soltani*
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, Ontario, Canada N0P 2C0
Robert E. Nurse
Affiliation:
Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0
Darren E. Robinson
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, Ontario, Canada N0P 2C0
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, Ontario, Canada N0P 2C0
*
Corresponding author's E-mail: nsoltani@ridgetownc.uoguelph.ca
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Abstract

Four field trials were conducted over a 2-yr period at Exeter (2005, 2006), Harrow (2006) and Ridgetown (2006), Ontario to evaluate the tolerance of pinto and small red Mexican (SRM) bean to the POST application of bentazon, imazethapyr, or their combination. Bentazon applied once or twice (to simulate a spray overlap in the field) at 840 g ai/ha and imazethapyr applied at 37.5 g/ha caused minimal injury (6% or less) in pinto and SRM bean and had no adverse effect on plant height, shoot dry weight, seed moisture content, and yield. Imazethapyr applied twice at 37.5 and all single and repeat applications containing 75 or 150 g/ha caused 15 to 44% injury to dry bean. These injuries were persistent and reduced plant height by as much as 21% and shoot dry weight by as much as 34%, but caused no adverse effect on maturity and yield, except for imazethapyr applied twice at 150 g/ha, which delayed maturity and reduced yield 16%. The addition of bentazon to imazethapyr applied as a tankmix reduced injury by as much as 23%. Imazethapyr at 37.5 or 75 g/ha combined with bentazon at 840 g/ha applied once or twice caused 3 to 23% injury but had no adverse effect on plant height, shoot dry weight, maturity, or yield. Two applications of imazethapyr at 150 g/ha plus bentazon at 840 g/ha reduced plant height 16% and shoot dry weight 28%.

Keywords

Bentazonimazethapyrpinto beansmall red Mexican bean, Phaseolus vulgaris L.Crop injurycrop tolerancedry beanpostemergence herbicidessensitivity
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 195 - 199
Copyright
Copyright © Weed Science Society of America 

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