Herbicide-Tolerant Corn Data
Data from field trials across the Corn Belt show that a soil-applied herbicide helps eliminate the risk of yield loss caused by grasses and broadleaf weeds outcompeting early emerging corn for moisture and nutrients. Corn that gets off to a weed-free start can achieve its yield potential. So, which herbicide should you use?
The following data suggests that using reduced rates of acetochlor products like Keystone®, Keystone LA, Surpass®, FulTime® or TopNotch® herbicide offers a greater level of grass and broadleaf weed control than metolachlor-based herbicides.
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TopNotch herbicide not only provided better control of foxtails, waterhemp and lambsquarters at full rates than Dual II Magnum herbicide, the difference was even more noticeable when comparing reduced rates. |
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Thirty-five experiments conducted in nine states over the course of two years found that a foundation of acetochlor followed by glyphosate yielded 7 percent more than a post treatment of glyphosate, even when the first application of glyphosate was applied early (2-inch weeds).1 That would account for a 12.25-bushel difference if your yield goal was 175 bushels, or earnings of $24.50 more per acre on $2 per bushel corn before herbicide cost.
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Evaluation of a two-pass program in Roundup Ready® corn in a Southern Illinois University trial that began with a soil-applied application outyielded a single post glyphosate application by 44 bushels per acre.2 At $2 per bushel corn, a grower would have netted a profit of approximately $62 per acre based on estimated cost of herbicides. |
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Keystone provided 90 percent control of giant foxtail and 99 percent control of lambsquarters in a trial at Purdue University. Meanwhile, Bicep II Magnum delivered just 65 percent control of giant foxtail and 85 percent control of common lambsquarters. Stalwart Xtra herbicide, also a metolachlor-based product, provided just 40 percent control of giant foxtail and 48 percent control of lambsquarters. |
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A Southern Illinois University trial looked at weed control in Roundup Ready corn 28 days after application. Whereas a half rate of Keystone provided 97 percent control of giant foxtail, a tank mix of Princep + Aatrex herbicides delivered just 67 percent control. Keystone also outperformed several metolachlor-based herbicides. |
1ipcm.wisc.edu/uw_weeds
2mccoy.lib.siu.edu/~weeds/feature/updates/Protecting%20crop%20yield%202004.pdf
®Roundup Ready is a registered trademark of Monsanto Company.
Keystone, Keystone LA, Surpass, FulTime, TopNotch, Aatrex, Bicep II Magnum and Stalwart Xtra are Restricted Use Pesticides. Keystone, Keystone LA, Surpass, FulTime and TopNotch are not available for sale, distribution or use in the state of New York.
Always read and follow label directions.
