Evaluation of Difficult to Control Broadleaf Weeds with an HPPD Herbicide Based Program in Soybean in SE Minnesota in 2015.
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1 Evaluation of Difficult to Control Broadleaf Weeds with an HPPD Herbicide Based Program in Soybean in SE Minnesota in 205. Behnken, Lisa M., Fritz R. Breitenbach, Ellen Sheehan and Dillon Welter The objective of this trial was to evaluate HPPD tolerant soybean weed control systems and crop response in southeastern Minnesota. The research site was a Lawler loam series with ph of 5.6, O.M. 2.% and soil test P and K levels of 32 ppm and 309 ppm, respectively. In the spring the field was disked and field cultivated once prior to planting. The previous crop was soybeans. The soybean variety was unknown and was planted May 20, 205 at a depth of.5 inches in 30 inch rows at a rate of 35,000 seeds per acre. A randomized complete block design was used with three replications. Preemergence (PRE) treatments were applied with a tractor mounted sprayer delivering 5 gpa at 40 psi using TTI 005 spray tips. Postemergence (Post I) treatments were applied with a tractor mounted sprayer delivering 5 gpa at 40 psi using TTJ spray tips. Evaluations of the plots were taken on June 3, June 0, June 23, July, and July 8. Application dates, environmental conditions, and weed stages can be found in Table. Performance ratings for giant ragweed control, common lambsquarters control, common waterhemp control, and crop injury response can be found in Tables 2 through 5, respectively. Grass control was excellent in all plots (99 percent control). Crop was destroyed on July 8 to comply with protocol requirements. (University of Minnesota Extension Regional Office, Rochester.) Table. Application timing, plant stage, and environmental conditions Date 5/20 6/0 Treatment PRE POST I Temperature (F) Air Soil Relative Humidity (%) Wind (mph) Soil Moisture SLIWet Normal Soybean Stage V Height (inch) 3.5 Giant Ragweed Weed Density (ft 2 ) 3 Height (inch) 2.5 Common Lambsquarter Weed Density (ft 2 ) 32 Height (inch) 0.25 Common Waterhemp Weed Density (ft 2 ) 28 Height (inch) 0.75 Grass Weed Density (ft 2 ) Height (inch) Rainfall after each application (inch) Week Week Week
2 Table 2. Giant ragweed control with HPPD herbicide systems in HPPD tolerant soybeans at Rochester, MN in 205. Giant ragweed Trt Treatment Rate Appl Percent Control (%) CHECK 0 e 0 e 0 d 0 d 0 d PREEMERGENCE APPLIED 05/20/205 2 SOA 27,5,4 / 98 a 98 a 98 a 98 a 97 a FLEXSTAR 7fl oz/a A 3 SOA 27,5, 5 / 4, 90 a 97 a 98 ab 97 ab 97 ab TRICOR 5.33oz/a A PREEMERGENCE (A) APPLIED 05/20/205 / POST I (B) APPLIED 06/0/205 4 SOA 5,5 / 4, 35 d 38 d 98 a 98 a 97 ab BOUNDARY 24fl oz/a A FUSION 2fl oz/a B MSO % v/v B 5 SOA 4,5 / 4, 58 c 37 d 97 ab 97 ab 96 ab BROADAXE 25fl oz/a A FUSION 2fl oz/a B MSO % v/v B 6 SOA 2,4 / 4, 80 b 85 b 97 b 95 b 95 ab AUTHORITY FIRST 5oz/a A 7 SOA 4,5 / 4, 77 b 7 c 9 c 86 c 86 c COBRA 0 fl oz/a B SELECT MAX 5 fl oz/a B COC.5 pt/a B AMS 7 lb/00 gal B POST I (B) APPLIED 06/0/205 8 SOA 4, 0 e 0 e 97 b 97 ab 94 b LSD P= Means followed by same letter or symbol do not significantly differ (P=.0, LSD)
3 Table 3. Common lambsquarters control with HPPD herbicide systems in HPPD tolerant soybeans at Rochester, MN in 205. Commom lambsquarters Trt Treatment Rate Appl Percent control (%) CHECK 0 b 0 c 0 c 0 d 0 c PREEMERGENCE APPLIED 05/20/205 2 SOA 27,5,4 / 99 a 99 a 99 a 99 a 99 a FLEXSTAR 7 fl oz/a A 3 SOA 27,5, 5 / 4, 99 a 99 a 99 a 99 a 99 a TRICOR 5.33 oz/a A PREEMERGENCE (A) APPLIED 05/20/205 / POST I (B) APPLIED 06/0/205 4 SOA 5,5 / 4, 99 a 99 a 99 a 99 a 99 a BOUNDARY 24 fl oz/a A 5 SOA 4,5 / 4, 99 a 99 a 99 a 99 a 99 a BROADAXE 25 fl oz/a A 6 SOA 2,4 / 4, 99 a 99 a 99 a 99 a 99 a AUTHORITY FIRST 5 oz/a A 7 SOA 4,5 / 4, 99 a 97 b 96 a 90 b 88 b COBRA 0 fl oz/a B SELECT MAX 5 fl oz/a B COC.5 pt/a B AMS 7 lb/00 gal B POST I (B) APPLIED 06/0/205 8 SOA 4, 0 b 0 c 76 b 79 c 88 b LSD P=
4 Table 4. Common waterhemp control with HPPD herbicide systems in HPPD tolerant soybeans at Rochester, MN in 205. Common waterhemp Trt Treatment Rate Appl Percent Control (%) CHECK 0 b 0 b 0 c 0 c 0 c PREEMERGENCE APPLIED 05/20/205 2 SOA 27,5,4 / 99 a 99 a 99 a 99 a 99 a FLEXSTAR 7fl oz/a A 3 SOA 27,5, 5 / 4, 99 a 99 a 99 a 99 a 99 a TRICOR 5.33oz/a A PREEMERGENCE (A) APPLIED 05/20/205 /POST I (B) APPLIED 06/0/205 4 SOA 5,5 / 4, 99 a 99 a 99 a 99 a 99 a BOUNDARY 24fl oz/a A FUSION 2fl oz/a B MSO % v/v B 5 SOA 4,5 / 4, 99 a 99 a 99 a 99 a 99 a BROADAXE 25fl oz/a A FUSION 2fl oz/a B MSO % v/v B 6 SOA 2,4 / 4, 99 a 99 a 99 a 99 a 99 a AUTHORITY FIRST 5oz/a A 7 SOA 4,5 / 4, 99 a 99 a 98 a 96 ab 96 b COBRA 0 fl oz/a B SELECT MAX 5 fl oz/a B COC.5 pt/a B AMS 7 lb/00 gal B POST I (B) APPLIED 06/0/205 8 SOA 4, 0 b 0 b 92 b 92 b 97 b LSD P=.0 4
5 Table 5. Crop response to HPPD herbicide systems at Rochester, MN in 205. Crop Response Trt Treatment Rate Appl Percent crop response (%) CHECK 0 a 0 c 0 c 0 b 0 b PREEMERGENCE APPLIED 05/20/205 2 SOA 27,5,4 / 0 a 3 b 0 c 0 b 0 b FLEXSTAR 7 fl oz/a A 3 SOA 27,5, 5 / 4, 0 a 20 a 0 c 0 b 0 b TRICOR 5.33 oz/a A PREEMERGENCE (A) APPLIED 05/20/205 / POST I (B) APPLIED 06/0/205 4 SOA 5,5 / 4, 0 a 0 c 30 b 0 b 0 b BOUNDARY 24 fl oz/a A 5 SOA 4,5 / 4, 0 a 0 c 30 b 0 b 0 b BROADAXE 25 fl oz/a A 6 SOA 2,4 / 4, 0 a 0 c 30 b 0 b 0 b AUTHORITY FIRST 5 oz/a A 7 SOA 4,5 / 4, 0 a 0 c 40 a 0 a 0 a COBRA 0 fl oz/a B SELECT MAX 5 fl oz/a B COC.5 pt/a B AMS 7 lb/00 gal B POST I (B) APPLIED 06/0/205 8 SOA 4, 0 a 0 c 30 b 0 b 0 b
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