By: Soltani, Nader
Soltani, N., Vyn, J. D. and Sikkema, P. H. 2009. Control of common waterhemp (Amaranthus tuberculatus var. rudis) in corn and soybean with sequential herbicide applications. Can. J. Plant Sci. 89: 127-132. Common waterhemp (Amaranthus tuberculatus) is an aggressive annual broadleaf whose distribution is expected to increase rapidly in agricultural land in eastern Canada. Eight field experiments (four in corn and four in soybean) over a 2-yr period (2005 and 2006) were established on two Ontario farms (near Comber and Petrolia, Ontario) with waterhemp infestations to evaluate the efficacy of various PRE- and POST-emergence herbicides applied alone or in sequence for the control of waterhemp in corn and soybean. There was minimal injury (up to 3.8%) to corn and soybean from the herbicide treatments evaluated. In corn, sequential herbicide programs of isoxaflutole+atrazine PRE fb either dicamba POST,
dicamba/diflufenzopyr POST, dicamba/atrazine POST or
mesotrione+atrazine POST provided consistent full-season control of waterhemp.
Corn yield was reduced 48% when waterhemp was not controlled. Corn yield was
equivalent to the weed-free check with the herbicide treatments evaluated. In
soybean, PRE or POST herbicides alone provided 41 to 94% control of waterhemp,
however, waterhemp control was increased to 90 to 99% with the sequential
herbicide programs. Dimethenamid (PRE; 1250 g ha(-1)) followed by glyphosate
(POST1; 900 g ha(-1)) followed by glyphosate (POST2; 900 g ha(-1)) controlled
waterhemp 99%. Results with waterhemp density and biomass were similar to
visible control. Soybean yield was reduced 41% when waterhemp was not
controlled. Soybean yield was equivalent to the weed-free check with all the
herbicide treatment except dimethenamid PRE, acifluorfen POST1 and fomesafen
POST1 where the yield was 30, 19, and 19% lower, respectively.
Soltani, N., Vyn, J. D. and Sikkema, P. H. 2009. Control of common waterhemp (Amaranthus tuberculatus var. rudis) in corn and soybean with sequential herbicide applications. Can. J. Plant Sci. 89: 127-132. Common waterhemp (Amaranthus tuberculatus) is an aggressive annual broadleaf whose distribution is expected to increase rapidly in agricultural land in eastern Canada. Eight field experiments (four in corn and four in soybean) over a 2-yr period (2005 and 2006) were established on two Ontario farms (near Comber and Petrolia, Ontario) with waterhemp infestations to evaluate the efficacy of various PRE- and POST-emergence herbicides applied alone or in sequence for the control of waterhemp in corn and soybean. There was minimal injury (up to 3.8%) to corn and soybean from the herbicide treatments evaluated. In corn, sequential herbicide programs of isoxaflutole+atrazine PRE fb either dicamba POST,
dicamba/diflufenzopyr POST, dicamba/atrazine POST or
mesotrione+atrazine POST provided consistent full-season control of waterhemp.
Corn yield was reduced 48% when waterhemp was not controlled. Corn yield was
equivalent to the weed-free check with the herbicide treatments evaluated. In
soybean, PRE or POST herbicides alone provided 41 to 94% control of waterhemp,
however, waterhemp control was increased to 90 to 99% with the sequential
herbicide programs. Dimethenamid (PRE; 1250 g ha(-1)) followed by glyphosate
(POST1; 900 g ha(-1)) followed by glyphosate (POST2; 900 g ha(-1)) controlled
waterhemp 99%. Results with waterhemp density and biomass were similar to
visible control. Soybean yield was reduced 41% when waterhemp was not
controlled. Soybean yield was equivalent to the weed-free check with all the
herbicide treatment except dimethenamid PRE, acifluorfen POST1 and fomesafen
POST1 where the yield was 30, 19, and 19% lower, respectively.Yangzhou pioneer chemical CO.,LTD.
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