Weed Management in field corn at Rochester, MN, in Date 5/12 6/2 6/10 6/23 Treatment Temperature (F) Relative Humidity (%) Wind (mph)
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1 Weed Management in field corn at Rochester, MN, in Behnken, Lisa M., Fritz R. Breitenbach, Ryan P. Miller, Thomas R. Hoverstad, Jodie Getting and Jeffrey L. Gunsolus The objective of this trial was to evaluate herbicide systems for weed control in field corn in southeastern Minnesota. The research site was a Lawler loam series with a ph of 7.3, organic matter of 2.6% and soil test P and K levels of 64 ppm and 226 ppm, respectively. Spring fertilizer was broadcast ahead of planting on April 16, at a rate of (N-P-K-S). The area was side dressed with an additional 35 b/a of N on June 25. The field was fall chisel plowed and spring disked once and field cultivated once prior to planting. The corn hybrid, Pioneer 37Y14LLRR2, was planted on May 12, 2008, at a depth of 2.0 inches in 30 inch rows at 35,000 seeds per acre. A randomized complete block design was used with four replications. Preemergence () and postemergence (POST) treatments were applied with a tractor-mounted sprayer delivering 20 gpa at 32 psi using Turbo Tee nozzles. Evaluations of the plots were taken on June 4, 9, 23, July 1, and August 4. Application dates, environmental conditions, and weed stages are listed below. The center two rows of each plot were machine harvested on November 3, (University of Minnesota Extension, Regional Office Rochester, Southern Research and Outreach Center Waseca, and Southwest Research and Outreach Center Lamberton, MN). Date 5/12 6/2 6/10 6/23 Treatment I II Temperature (F) Air soil Relative Humidity (%) Wind (mph) Soil moisture Adequate Excessive Excessive Inadequate Corn stage V3 4-Collar 7-collar height (inch) Giant Ragweed weed density (ft 2 ) height (inch) Common Lambsquarters weed density (ft 2 ) height (inch) Common Waterhemp weed density (ft 2 ) height (inch) Giant foxtail weed density (ft 2 ) height (inch) Rainfall after each application (inch) week week week
2 Table 1. Performance of herbicide systems for giant ragweed control in field corn on June 4, 9, 23, July 1 and August 4 at Rochester, MN, in Treatment Rate Giant Ragweed Control Yield Corvus 5.6 oz / Dual II Magnum/ Halex GT + Atrazine + NIS 1 pt/ 3.6 pt + 16 oz % v/v /I Balance Flexx/ Laudis + MSO + 28% N 3 oz/ 3 oz + 1% v/v qt Harness/ Ignite 1.75 pt/ 22 oz + 2 qt Harness/ Laudis + MSO + 28% N 1.75 pt/ 3 oz +1% v/v qt Harness/ Roundup WeatherMax 1.25 pt/ 22 oz Lumax/ Touchdown Total 3 pt/ 24 oz SureStart/ Durango 1.75 pt/ 24 oz SureStart/ Durango 2 pt/ 24 oz SureStart + Atrazine/ Durango 2 pt + 2 pt/ 24 oz Outlook/ Roundup WeatherMax 12 oz/ 22 oz Outlook/ Roundup WeatherMax + Status 12 oz/ 22 oz oz Harness/ Impact + Atrazine + MSO + 28% N 1.75 pt/ 0.5 oz + 24 oz + 1% v/v + 2.5% v/v Harness/ Impact + Atrazine + Roundup WeatherMax 1.25 pt/ 0.5 oz SureStart + Durango 1.75 pt + 24 oz Halex GT + Atrazine + NIS 3.6 pt + 16 oz % v/v /II I Require Q (Rimsulfuron + Dicamba + Isoxadifen-ethyl) + Atrazine + Roundup PowerMax oz (1 oz oz oz) + 16 oz + 22 oz oz (0.92 oz oz oz) + Callisto + Roundup PowerMax + 1 oz + 16 oz LSD (P=0.10)
3 Table 2. Performance of herbicide systems for common lambsquarter control in field corn on June 4, 9, 23, July 1 and August 4] at Rochester, MN, in Treatment Rate Common Lambsquarter Control Yield Corvus 5.6 oz / Dual II Magnum/ Halex GT + Atrazine + NIS 1 pt/ 3.6 pt + 16 oz % v/v /I Balance Flexx/ Laudis + MSO + 28% N 3 oz/ 3 oz + 1% v/v qt Harness/ Ignite 1.75 pt/ 22 oz + 2 qt Harness/ Laudis + MSO + 28% N 1.75 pt/ 3 oz +1% v/v qt Harness/ Roundup WeatherMax 1.25 pt/ 22 oz Lumax/ Touchdown Total 3 pt/ 24 oz SureStart/ Durango 1.75 pt/ 24 oz SureStart/ Durango 2 pt/ 24 oz SureStart + Atrazine/ Durango 2 pt + 2 pt/ 24 oz Outlook/ Roundup WeatherMax 12 oz/ 22 oz Outlook/ Roundup WeatherMax + Status 12 oz/ 22 oz oz Harness/ Impact + Atrazine + MSO + 28% N 1.75 pt/ 0.5 oz + 24 oz + 1% v/v + 2.5% v/v Harness/ Impact + Atrazine + Roundup WeatherMax 1.25 pt/ 0.5 oz SureStart + Durango 1.75 pt + 24 oz Halex GT + Atrazine + NIS 3.6 pt + 16 oz % v/v /II I Require Q (Rimsulfuron + Dicamba + Isoxadifen-ethyl) + Atrazine + Roundup PowerMax oz (1 oz oz oz) + 16 oz oz Callisto + Roundup PowerMax + 1 oz + 16 oz LSD (P=0.10)
4 Table 3. Performance of herbicide systems for common waterhemp control in field corn on June 4, 9, 23, July 1 and August 4 at Rochester, MN, in Treatment Rate Common Waterhemp Control Yield Corvus 5.6 oz / Dual II Magnum/ Halex GT + Atrazine + NIS 1 pt/ 3.6 pt + 16 oz % v/v /I Balance Flexx/ Laudis + MSO + 28% N 3 oz/ 3 oz + 1% v/v qt Harness/ Ignite 1.75 pt/ 22 oz + 2 qt Harness/ Laudis + MSO + 28% N 1.75 pt/ 3 oz +1% v/v qt Harness/ Roundup WeatherMax 1.25 pt/ 22 oz Lumax/ Touchdown Total 3 pt/ 24 oz SureStart/ Durango 1.75 pt/ 24 oz SureStart/ Durango 2 pt/ 24 oz SureStart + Atrazine/ Durango 2 pt + 2 pt/ 24 oz Outlook/ Roundup WeatherMax 12 oz/ 22 oz Outlook/ Roundup WeatherMax + Status 12 oz/ 22 oz oz Harness/ Impact + Atrazine + MSO + 28% N 1.75 pt/ 0.5 oz + 24 oz + 1% v/v + 2.5% v/v Harness/ Impact + Atrazine + Roundup WeatherMax 1.25 pt/ 0.5 oz SureStart + Durango 1.75 pt + 24 oz Halex GT + Atrazine + NIS 3.6 pt + 16 oz % v/v /II I Require Q (Rimsulfuron + Dicamba + Isoxadifen-ethyl) oz (1 oz oz oz) Callisto + Roundup PowerMax + 1 oz + 16 oz LSD (P=0.10)
5 Table 4. Performance of herbicide systems for giant foxtail control in field corn on June 4, 9, 23, July 1 and August 4 at Rochester, MN, in Treatment Rate Grass Control Yield Corvus 5.6 oz / Dual II Magnum/ Halex GT + Atrazine + NIS 1 pt/ 3.6 pt + 16 oz % v/v /I Balance Flexx/ Laudis + MSO + 28% N 3 oz/ 3 oz + 1% v/v qt Harness/ Ignite 1.75 pt/ 22 oz + 2 qt Harness/ Laudis + MSO + 28% N 1.75 pt/ 3 oz +1% v/v qt Harness/ Roundup WeatherMax 1.25 pt/ 22 oz Lumax/ Touchdown Total 3 pt/ 24 oz SureStart/ Durango 1.75 pt/ 24 oz SureStart/ Durango 2 pt/ 24 oz SureStart + Atrazine/ Durango 2 pt + 2 pt/ 24 oz Outlook/ Roundup WeatherMax 12 oz/ 22 oz Outlook/ Roundup WeatherMax + Status 12 oz/ 22 oz oz Harness/ Impact + Atrazine + MSO + 28% N 1.75 pt/ 0.5 oz + 24 oz + 1% v/v + 2.5% v/v Harness/ Impact + Atrazine + Roundup WeatherMax 1.25 pt/ 0.5 oz SureStart + Durango 1.75 pt + 24 oz Halex GT + Atrazine + NIS 3.6 pt + 16 oz % v/v /II I Require Q (Rimsulfuron + Dicamba + Isoxadifen-ethyl) oz (1 oz oz oz) Callisto + Roundup PowerMax + 1 oz + 16 oz LSD (P=0.10)
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