Volunteer Glyphosate and Glufosinate Resistant Corn Competitiveness and Control in Glyphosate and Glufosinate Resistant Corn
- 1 University of Guelph, Ridgetown Campus, Ridgetown, Canada
- 2 University of Guelph, Ridgetown Campus, Ridgetown, Canada
- 3 University of Guelph, Ridgetown Campus, Ridgetown, Canada
Abstract
Glyphosate and glufosinate resistant (RR/LL) volunteer corn has become a problem when hybrid RR/LL corn follows hybrid RR/LL corn in the rotation. A total of six field trials were conducted over a three-year period (2008 to 2010) in southwestern Ontario to 1) evaluate the competitiveness of volunteer RR/LL corn in hybrid RR/LL corn, and 2) determine how to control volunteer RR/LL corn in hybrid RR/LL corn. The predicted volunteer RR/LL corn density to reduce hybrid RR/LL corn yield by 5% was 1.7 volunteer RR/LL corn plants m －2 . There was no crop injury in hybrid RR/LL corn with herbicides evaluated at 1 and 2 WAA except for rimsulfuron(15 g · ai · ha －1 ) and foramsulfuron (35 g · ai · ha －1 ) which caused as much as 5% and 11% injury in hybrid RR/LL corn, respectively. Glyphosate (1800 g · ae · ha －1 ), glufosinate(500 g · ae · ha －1 ) and glyphosate + glufosinate (1800 + 500 g · ae · ha －1 ) provided up to 18%, 10% and 21% control of volunteer RR/LL corn, respectively. The POST application of rimsulfuron (15 g · ai · ha －1 ), nicosulfuron (25 g · ai · ha －1) , nicosulfuron/rimsulfuron (25 g · ai · ha －1 ), foramsulfuron (35 g · ai · ha －1 ), and primisulfuron/dicamba (166 g · ai · ha －1 ) did not provided any control of volunteer RR/LL corn. Glyphosate and glyphosate + glufosinate reduced volunteer corn density 26% and 30%, respectively. The other herbicides evaluated did not reduce volunteer RR/LL corn density compared to the weedy control. None of the herbicides evaluated reduced volunteer RR/LL corn cob numbers compared to the weedy control. Glyphosate + glufosinate applied POST reduced volunteer RR/LL corn yield 35% compared to the weedy control but other herbicides evaluated caused no reduction in volunteer RR/LL corn yield compared to the weedy control. Glyphosate applied POST resulted in hybrid RR/LL corn yield equivalent to the weed free control but all other herbicide treatments resulted hybrid RR/LL corn yield equivalent to the weedy control. This research concludes that volunteer RR/LL corn can be very competitive with RR/LL hybrid corn. None of the herbicides evaluated provided adequate control of volunteer RR/LL corn in hybrid RR/LL corn.
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