Weather conditions prior to POST I, II & III applications were favorable due to abundant moisture conditions and moderate temperatures.
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1 Evaluation of the performance of Balance Flexx, Corvus and Capreno herbicide programs for weed control in field corn at Rochester, MN, in Breitenbach, Fritz R., Lisa M. Behnken, Ryan P. Miller, Jeffrey L. Gunsolus, Louis E. Kuisle, and Kyle J. Poss. The objective of this trial was to evaluate the performance of Balance Flexx, Corvus and Capreno programs for weed control in corn in southeastern Minnesota. The research site was a Lawler loam series with a ph of 7.2 and soil test P and K levels of 81 ppm and 204 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 spring disked and field cultivated once prior to planting. The corn hybrid, NK N41C-3000GT 98 RM, was planted on May 5, 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 (PRE) 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 May 22, 27, and 30, June 9, 18, and 30, and July 21. Application dates, environmental conditions, and weed stages are listed below. The center two rows of each plot were machine harvested on November 3, Date 5/5 5/22 6/2 6/10 Treatment PRE I II Temperature (F) Air soil Relative Humidity (%) Wind (mph) Soil moisture Adequate Inadequate Excessive Adequate Corn stage V1-V2 V4 V5 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) Wooly Cupgrass weed density (ft 2 ) height (inch) Rainfall after each application (inch) week week week CONCLUSIONS Weather conditions following preemergence applications allowed for excellent activation of the herbicides with 1.89 inches of precipitation falling within one week of application. Preemgence control of giant ragweed was poor with no treatments rated higher than 41% (5/22 rating). In dramatic contrast, preemergence common lambsquarters control was excellent for all soil applied treatments resulting in 99% control (5/22 rating). No rating data for soil applied herbicides was collected for common waterhemp. Soil applied treatments provided poor control of woolly cupgrass with the best treatment, Harness Xtra, achieving only 65% control. The remaining treatments ranged between 25% to 46% control (5/22 rating). Weather conditions prior to, II & III applications were favorable due to abundant moisture conditions and moderate temperatures. Sequential PRE/II applications consistently provided very good to excellent giant ragweed control. All treatments with the exception of Harness Xtra followed by Roundup PowerMax, 92% control, provided better than 98% control (7/21 rating). applications provided very good to excellent control of giant ragweed, 96% or better. Only the Balance Flexx 5 oz rate + Aatrex offered slightly less control at 93% (7/21 rating). I applications provided very good to excellent giant ragweed control as well with all treatments at 94% control or better (7/21 rating).
2 Common lambsquarters control was excellent throughout the duration of the trial and no treatment provided less than 97% control regardless of application timing or rating date. All sequential PRE/I applications provided excellent common waterhemp control with no treatment providing less that 95% control. applications of Corvus + Aatrex, although offering very good control at 88%, did show some weakness when compared to the other treatments for common waterhemp control. I treatments provided very good to excellent control for common waterhemp. Statistically, the best treatments included Halex GT, 99%, and Capreno + Aatrex + MSO, 98%, (7/21 rating). All other treatments provided at least 92% control of common waterhemp. All sequential PRE/II applications provided very good woolly cupgrass control with the exception of the sequential Lumax treatment, 61%, and the Balance Flexx Capreno +Aatrex treatment, 77%. The remainder of the treatments provided at least 90% control of woolly cupgrass (7/21 rating). applications provided a wider range of woolly cupgrass control. Statistically, the best treatments were Balance Flexx 5 oz rate + Aatrex, 84%, and both rates of Corvus + Aatrex, 83% and 79% control, respectively (7/21 rating). The weakest treatment was Lumax at 58% control (7/21 rating). I applications all provided good to very good control of woolly cupgrass. Statistically the best treatments were Halex GT, 92%, Capreno + Roundup PowerMax, 89%, Capreno + Ignite, 89%, Capreno + Aatrex, 87%, and Laudis + Ignite + Aatrex, 88% (7/21 rating). The weakest treatment was Laudis + Aatrex at 81% control (7/21 rating). (University of Minnesota Extension, Regional Office Rochester).
3 Table 1. Performance of herbicide systems for giant ragweed control in field corn on May 22, June 9, 18, and 30, and July 21 at Rochester, MN, in Treatment Rate Giant Ragweed Control Yield 5/22 6/9 6/18 6/30 7/21 Balance Flexx / Laudis + MSO + 28% UAN 4 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Laudis + MSO + 28% UAN 5 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Balance Flexx / Ignite Aatrex + AMS 3 fl oz / 22 fl oz + 1 pt + 17 lbs/100 gal Balance Flexx / Capreno + Aatrex + COC + UAN 3 fl oz / 3 fl oz + 1 pt + 1 % v/v qt Balance Flexx / Capreno + MSO + UAN 3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 3.3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 4.5 fl oz / 3 fl oz + 1% v/v qt Corvus / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Corvus / Laudis + Aatrex + COC + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Corvus / Laudis + Aatrex + MSO + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Harness Xtra / Roundup PowerMax + AMS 1.3 qt / 22 fl oz + 17 lbs/100 gal Lumax / Lumax + NIS 1.5 qt / 1.5 qt % v/v Balance Flexx + Aatrex 4 fl oz + 1 pt Balance Flexx + Aatrex 5 fl oz + 1 pt Corvus + Aatrex 3.3 fl oz + 1 pt Corvus + Aatrex 4.5 fl oz + 1 pt Lumax + NIS 2.5 qt % v/v I Laudis + Ignite Aatrex + AMS 2 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Laudis + Aatrex + Roundup PowerMax + AMS 3 fl oz + 1 pt + 11 fl oz + 17 lbs/100 gal Laudis + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + COC + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Ignite AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Capreno + Ignite Aatrex + AMS 3 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Capreno + Roundup PowerMax + AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Halex GT + NIS + AMS 3.6 pts % v/v + 17lbs/100 gal LSD (P=0.10)
4 Table 2. Performance of herbicide systems for common lambsquarters control in field corn on May 22, June 9, 18, and 30, and July 21 at Rochester, MN, in Treatment Rate Common Lambsquarters Control Yield 5/22 6/9 6/18 6/30 7/21 Balance Flexx / Laudis + MSO + 28% UAN 4 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Laudis + MSO + 28% UAN 5 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Balance Flexx / Ignite Aatrex + AMS 3 fl oz / 22 fl oz + 1 pt + 17 lbs/100 gal Balance Flexx / Capreno + Aatrex + COC + UAN 3 fl oz / 3 fl oz + 1 pt + 1 % v/v qt Balance Flexx / Capreno + MSO + UAN 3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 3.3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 4.5 fl oz / 3 fl oz + 1% v/v qt Corvus / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Corvus / Laudis + Aatrex + COC + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Corvus / Laudis + Aatrex + MSO + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Harness Xtra / Roundup PowerMax + AMS 1.3 qt / 22 fl oz + 17 lbs/100 gal Lumax / Lumax + NIS 1.5 qt / 1.5 qt % v/v Balance Flexx + Aatrex 4 fl oz + 1 pt Balance Flexx + Aatrex 5 fl oz + 1 pt Corvus + Aatrex 3.3 fl oz + 1 pt Corvus + Aatrex 4.5 fl oz + 1 pt Lumax + NIS 2.5 qt % v/v I Laudis + Ignite Aatrex + AMS 2 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Laudis + Aatrex + Roundup PowerMax + AMS 3 fl oz + 1 pt + 11 fl oz + 17 lbs/100 gal Laudis + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + COC + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Ignite AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Capreno + Ignite Aatrex + AMS 3 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Capreno + Roundup PowerMax + AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Halex GT + NIS + AMS 3.6 pts % v/v + 17lbs/100 gal LSD (P=0.10)
5 Table 3. Performance of herbicide systems for common waterhemp control in field corn on May 22, June 9, 18, and 30, and July 21 at Rochester, MN, in Treatment Rate Common Waterhemp Control Yield 5/30 6/9 6/18 6/30 7/21 Balance Flexx / Laudis + MSO + 28% UAN 4 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Laudis + MSO + 28% UAN 5 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Balance Flexx / Ignite Aatrex + AMS 3 fl oz / 22 fl oz + 1 pt + 17 lbs/100 gal Balance Flexx / Capreno + Aatrex + COC + UAN 3 fl oz / 3 fl oz + 1 pt + 1 % v/v qt Balance Flexx / Capreno + MSO + UAN 3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 3.3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 4.5 fl oz / 3 fl oz + 1% v/v qt Corvus / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Corvus / Laudis + Aatrex + COC + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Corvus / Laudis + Aatrex + MSO + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Harness Xtra / Roundup PowerMax + AMS 1.3 qt / 22 fl oz + 17 lbs/100 gal Lumax / Lumax + NIS 1.5 qt / 1.5 qt % v/v Balance Flexx + Aatrex 4 fl oz + 1 pt Balance Flexx + Aatrex 5 fl oz + 1 pt Corvus + Aatrex 3.3 fl oz + 1 pt Corvus + Aatrex 4.5 fl oz + 1 pt Lumax + NIS 2.5 qt % v/v I Laudis + Ignite Aatrex + AMS 2 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Laudis + Aatrex + Roundup PowerMax + AMS 3 fl oz + 1 pt + 11 fl oz + 17 lbs/100 gal Laudis + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + COC + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Ignite AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Capreno + Ignite Aatrex + AMS 3 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Capreno + Roundup PowerMax + AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Halex GT + NIS + AMS 3.6 pts % v/v + 17lbs/100 gal LSD (P=0.10)
6 Table 4. Performance of herbicide systems for woolly cupgrass control in field corn on May 22, June 9, 18, and 30, and July 21 at Rochester, MN, in Treatment Rate Woolly Cupgrass Control Yield 5/22 6/9 6/18 6/30 7/21 Balance Flexx / Laudis + MSO + 28% UAN 4 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Laudis + MSO + 28% UAN 5 fl oz / 3 fl oz + 1% v/v qt Balance Flexx / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Balance Flexx / Ignite Aatrex + AMS 3 fl oz / 22 fl oz + 1 pt + 17 lbs/100 gal Balance Flexx / Capreno + Aatrex + COC + UAN 3 fl oz / 3 fl oz + 1 pt + 1 % v/v qt Balance Flexx / Capreno + MSO + UAN 3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 3.3 fl oz / 3 fl oz + 1% v/v qt Corvus / Laudis + MSO + UAN 4.5 fl oz / 3 fl oz + 1% v/v qt Corvus / Ignite Laudis + AMS 3 fl oz / 22 fl oz + 2 fl oz + 17 lbs/100 gal Corvus / Laudis + Aatrex + COC + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Corvus / Laudis + Aatrex + MSO + UAN 2.5 fl oz / 2 fl oz + 1 pt + 1 % v/v qt Harness Xtra / Roundup PowerMax + AMS 1.3 qt / 22 fl oz + 17 lbs/100 gal Lumax / Lumax + NIS 1.5 qt / 1.5 qt % v/v Balance Flexx + Aatrex 4 fl oz + 1 pt Balance Flexx + Aatrex 5 fl oz + 1 pt Corvus + Aatrex 3.3 fl oz + 1 pt Corvus + Aatrex 4.5 fl oz + 1 pt Lumax + NIS 2.5 qt % v/v I Laudis + Ignite Aatrex + AMS 2 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Laudis + Aatrex + Roundup PowerMax + AMS 3 fl oz + 1 pt + 11 fl oz + 17 lbs/100 gal Laudis + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + COC + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Aatrex + MSO + UAN 3 fl oz + 1 pt + 1% v/v qt Capreno + Ignite AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Capreno + Ignite Aatrex + AMS 3 fl oz + 22 fl oz + 1 pt + 17 lbs/100 gal Capreno + Roundup PowerMax + AMS 3 fl oz + 22 fl oz + 17 lbs/100 gal Halex GT + NIS + AMS 3.6 pts % v/v + 17lbs/100 gal LSD (P=0.10)
5/23 6/26 6/30 7/21 CONCLUSIONS
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