Date 5/21 Treatment. POST I Temperature (F) Air 65 Soil 70.2 Relative Humidity (%) 50 Wind (mph) 8 Soil Moisture. Adequate Corn
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1 Weed Control and Crop Tolerance with SureStart Herbicide Programs in Field Corn Breitenbach, Fritz R, Lisa M. Behnken, Ryan P. Miller, Nicole Behnken and Katherine Sheehan The objective of this trial was to evaluate the performance of SureStart herbicide and comparable herbicide programs for weed control in field corn in southeastern Minnesota. The research site was a Lawler loam series with a ph of 6.5 and soil test P and K levels of 60 ppm and 222 ppm, respectively. Spring fertilizer was broadcast ahead of planting on April 17, at a rate of (N-P-K-S). The area was side dressed with an additional 30 lb/a of N on June 15. The previous crop was field corn. The field was fall chisel plowed, spring disked, field cultivated and roto-tilled prior to planting. The corn hybrid, Pioneer 35F44 (quad stacked), was planted on April 23, 2009, at a depth of 1.5 inches in 30 inch rows at 32,000 seeds per acre. A large amount of crop residue was still present at planting time. Heavy crop residue coupled with a common stalk borer infestation led to reduced stands in several plots. A randomized complete block design was used with four replications. Postemergence (POST) treatments were applied with a tractormounted sprayer delivering 20 gpa at 32 psi using Turbo Tee nozzles. Evaluations of the plots were taken on May 27, June 4 and June 18. Application dates, environmental conditions and weed stages are listed below. The center two rows of each plot were machine harvested on November 13, The general trend for weed control was slightly higher for the 2X rates compared to the 1X rates for all weeds evaluated; giant ragweed, common lambsquarters, common waterhemp and giant foxtail. The Durango DMA and the Ignite 280 1X and 2X rates provided similar weed control at each rate. However, weed control was significantly lower than the other treatments, 6/18 rating date. CROP RESPONSE Necrosis SureStart at the 1X rate plus Ignite 280 resulted in a higher percentage of necrosis. SureStart at the 2X rate plus Durango DMA, atrazine or Ignite 280 and Ignite 280 alone resulted in a higher level of necrosis compared to the Durango DMA or Halex GT treatments. (5/27 rating date) Chlorosis SureStart at the 1X rate plus atrazine and Durango DMA or plus Ignite 280 resulted in a higher percentage of chlorosis compared to the other treatments (5/27 rating). Surestart at the 2X rate plus Durango DMA, or plus atrazine and Durango DMA, or Ignite 280 alone dramatically increased chlorosis compared to the other treatments. (5/27 rating date) Purpling was noted in the plots but showed no significant pattern. Stunting was observed in the treatments that included 2X rates of SureStart. Date 5/21 Treatment POST I Temperature (F) Air 65 Soil 70.2 Relative Humidity (%) 50 Wind (mph) 8 Soil Moisture Adequate Corn Stage V2-V3 Height (inch) 5.0 Giant Ragweed Weed density (ft 2 ) 4.4 Height (inch) 4.8 Common Lambsquarters Weed density (ft 2 ) 8.3 Height (inch) 4.6 Common Waterhemp Weed density (ft 2 ) 11.6 Height (inch) 2.0 Giant Foxtail Weed density (ft 2 ) 6.4 Height (inch) 4.5 Rainfall after each application Week Week Week
2 Table 1. Performance of herbicide systems for giant ragweed control in field corn on June 4 and 18 at Rochester, MN, in 2009 Treatment Rate Giant Ragweed Control Yield (rate/a) (%) (bu/a) SureStart + Durango DMA 1.74 pt/a pt/a ab SureStart + Aatrex 4L + Durango DMA 1.74 pt/a + 2 pt/a pt/a b Durango DMA 1.5 pt/a d SureStart + Ignite pt/a + 22 fl oz/a bc Ignite fl oz/a cd Halex GT 3.6 pt/a ab SureStart + Durango DMA 3.48 pt/a + 3 pt/a +10% v/v bc SureStart + Aatrex 4L + Durango DMA 3.48 pt/a + 4 pt/a + 3 pt/a + 10% v/v ab Durango DMA 3 pt/a + 10% v/v d SureStart + Ignite pt/a + 44 fl oz/a + 10% v/v ab Ignite fl oz/a + 10% v/v d Halex GT 7.2 pt/a + 10% v/v a LSD (P=0.10) Table 2. Performance of herbicide systems for common lambsquarters control in field corn on June 4 and 18 at Rochester, MN, in Treatment Rate Common Lambsquarters Control Yield SureStart + Durango DMA 1.74 pt/a pt/a ab SureStart + Aatrex 4L + Durango DMA 1.74 pt/a + 2 pt/a pt/a b Durango DMA 1.5 pt/a d SureStart + Ignite pt/a + 22 fl oz/a bc Ignite fl oz/a cd Halex GT 3.6 pt/a ab SureStart + Durango DMA 3.48 pt/a + 3 pt/a +10% v/v bc SureStart + Aatrex 4L + Durango DMA 3.48 pt/a + 4 pt/a + 3 pt/a + 10% v/v ab Durango DMA 3 pt/a + 10% v/v d SureStart + Ignite pt/a + 44 fl oz/a + 10% v/v ab Ignite fl oz/a + 10% v/v d Halex GT 7.2 pt/a + 10% v/v a LSD (P=0.10)
3 Table 3. Performance of herbicide systems for common waterhemp control in field corn on June 4 and 18 at Rochester, MN, in Treatment Rate Common Waterhemp Control Yield SureStart + Durango DMA 1.74 pt/a pt/a ab SureStart + Aatrex 4L + Durango DMA 1.74 pt/a + 2 pt/a pt/a b Durango DMA 1.5 pt/a d SureStart + Ignite pt/a + 22 fl oz/a bc Ignite fl oz/a cd Halex GT 3.6 pt/a ab SureStart + Durango DMA 3.48 pt/a + 3 pt/a +10% v/v bc SureStart + Aatrex 4L + Durango DMA 3.48 pt/a + 4 pt/a + 3 pt/a + 10% v/v ab Durango DMA 3 pt/a + 10% v/v d SureStart + Ignite pt/a + 44 fl oz/a + 10% v/v ab Ignite fl oz/a + 10% v/v d Halex GT 7.2 pt/a + 10% v/v a LSD (P=0.10) Table 4. Performance of herbicide systems for giant foxtail control in field corn on June 4 and 18 at Rochester, MN, in Treatment Rate Giant Foxtail Control Yield SureStart + Durango DMA 1.74 pt/a pt/a ab SureStart + Aatrex 4L + Durango DMA 1.74 pt/a + 2 pt/a pt/a b Durango DMA 1.5 pt/a d SureStart + Ignite pt/a + 22 fl oz/a bc Ignite fl oz/a cd Halex GT 3.6 pt/a ab SureStart + Durango DMA 3.48 pt/a + 3 pt/a +10% v/v bc SureStart + Aatrex 4L + Durango DMA 3.48 pt/a + 4 pt/a + 3 pt/a + 10% v/v ab Durango DMA 3 pt/a + 10% v/v d SureStart + Ignite pt/a + 44 fl oz/a + 10% v/v ab Ignite fl oz/a + 10% v/v d Halex GT 7.2 pt/a + 10% v/v a LSD (P=0.10)
4 Table 5. Crop response to herbicides applied postemergence at 1X and 2X labeled rates on May 27, June 4 and June 18 at Rochester, MN in Treatment Rate Injury Necrosis Chlorosis Purpling Stunting Height 5/27 5/27 5/27 6/4 5/27 (rate/a) (%) (inches) Untreated Check NA 1X Rates SureStart + Durango DMA 1.74 pt/a pt/a SureStart + Aatrex 4L + Durango DMA 1.74 pt/a + 2 pt/a pt/a Durango DMA 1.5 pt/a SureStart + Ignite pt/a + 22 fl oz/a Ignite fl oz/a Halex GT 3.6 pt/a X Rates SureStart + Durango DMA 3.48 pt/a + 3 pt/a % v/v SureStart + Aatrex 4L + Durango DMA 3.48 pt/a + 4 pt/a + 3 pt/a % v/v Durango DMA 3 pt/a + 10% v/v SureStart + Ignite pt/a + 44 fl oz/a % v/v Ignite fl oz/a + 10% v/v Halex GT 7.2 pt/a + 10% v/v LSD (P=0.10)
5 Table 6. Residue ratings and corn population on June 4 at Rochester, MN in Treatment Rate Residue Population 6/4 6/4 (rate/a) 1 5 scale 1=none plants/a Untreated Check NA 9758 SureStart + Durango DMA 1.74 pt/a pt/a SureStart + Aatrex 4L + Durango DMA 1.74 pt/a + 2 pt/a pt/a Durango DMA 1.5 pt/a SureStart + Ignite pt/a + 22 fl oz/a Ignite fl oz/a Halex GT 3.6 pt/a SureStart + Durango DMA 3.48 pt/a + 3 pt/a +10% v/v SureStart + Aatrex 4L + Durango DMA 3.48 pt/a + 4 pt/a + 3 pt/a + 10% v/v Durango DMA 3 pt/a + 10% v/v SureStart + Ignite pt/a + 44 fl oz/a + 10% v/v Ignite fl oz/a + 10% v/v Halex GT 7.2 pt/a + 10% v/v LSD (P=0.10)
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