Aminocyclopyrachlor for Weed Control in Pasture and Rangelands. F. Yelverton, L. Warren and T. Gannon North Carolina State University
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1 Aminocyclopyrachlor for Weed Control in Pasture and Rangelands F. Yelverton, L. Warren and T. Gannon North Carolina State University
2 Introduction Aminocyclopyrachlor (AMCP) Extremely active broadleaf herbicide Combinations for more broad-spectrum control AMCP + metsulfuron (Rejuvra) AMCP + triclopyr (Invora) AMCP + 2,4-D
3 Postemergence Weed Control (Winter Annuals & Cool Season Perennials) 0.35 to 0.5 oz ai/a > 98% control of white clover, common dandelion, purple cudweed and hairy buttercup
4 Postemergence Weed Control (Winter Annuals & Cool Season Perennials) 0.51 to 1.0 oz ai/a > 92% control of buckhorn plantain, catsear dandelion, hop clover, henbit, purple deadnettle, wild violet 100% control of facelis, common chickweed, Brazilian catsear, Florida betony, curly dock, Carolina geranium 0% yellow woodsorrel control
5 Postemergence Weed Control (Winter Annuals & Cool Season Perennials) 1.01 to 1.5 oz ai/a > 91% control of Florida pusley (3 wk seq.), lawn burweed 100% control of annual blueeyed grass 0-98% control of corn speedwell (very unpredictable) 0% mouseear chickweed, parsley-piert control 0% wild garlic one app; > 90% 4-wk sequential
6 % Control Henbit and Winter Weed Control in Coastal Bermudagrass Using AMCP Combinations LSD p=.05 +metsulfuron 0.77 oz ai/a + chlorsulfuron 0.83 oz ai/a LAMAM VICAN GERCA CAPBP CERVU LINCA VERAR Sampson County ,4-D 0.36 oz ai/a metsulfuron + chlorsulfuron oz ai/a Check Applied Mar 7 NIS applied at 0.25%
7 Nontreated Apr 30, 2013
8 AMCP + 2,4-D Apr 30, 2013 Yellow woodsorrel Mouseear chickweed
9 AMCP + metsulfuron Apr 20, 2013 (8 WAT)
10 Corn speedwell 1.5 oz ai/a 4 WAT no control
11 Wild garlic 1.1 oz ai/a AMCP 12 DAT plant eventually recovered With 4-wk sequential > 90% control
12 Wild radish 2.0 oz ai/a 4 WAT Stunted seed delay NCSU Research 1.51 to 2.0 oz ai/a 33% wild radish control
13 Postemergence Weed Control (Winter Annuals & Cool Season Perennials) No injury symptoms to mouseear chickweed, parsley-piert and yellow woodsorrel Tank-mix partner definitely needed (but not 2,4-D) Slight to moderate injury symptoms to corn speedwell, wild garlic and wild radish Possible benefit from timely sequential application or tankmix partner (possibly 2,4-D but not on corn speedwell)
14 Postemergence Weed Control (Summer Annuals & Warm Season Perennials) NCSU Research: 0.75 to 1.5 oz ai/a > 86% > 92% 100% 83% 95% Virginia buttonweed control annual lespedeza, dogfennel, pink purslane, goldenrod species, carpetweed control horsenettle, horseweed, dollarweed control smooth crabgrass early tiller one application smooth crabgrass early tiller 3-wk sequential
15 SWSS Weed Survey of Southern States (2012) Warm Season Weeds AMCP alone: 100% horsenettle, horseweed, dogfennel Combination products containing metsulfuron, chlorsulfuron or triclopyr provided complete control of common ragweed and 90%+ control of spiny amaranth Arrowleaf sida: evaluated in 2013 Bitter sneezeweed, blackberry, cocklebur, prickly pear, multiflora rose, thistle sp. (not evaluated yet)
16 % Control Post Arrowleaf Sida Control in Coastal Bermuda Using AMCP Combinations LSD p=.05 (New germination) 8-Jul 7-Aug 3-Sep Sampson County: ,4-D 0.36 lb ai/a + 2,4-D 0.54 lb ai/a + metsulfuron 0.77 oz ai/a + metsulfuron 1.28 oz ai/a + chlorsulfuron 1.38 oz ai/a + triclopyr lb ai/a triclopyr + fluroxypyr 0.5 lb ai/a Check Applied Jun % Induce
17 Nontreated Jul 8, 2013
18 AMCP + metsulfuron 1.28 oz ai/a Jul 8, 2013 (4 WAT) AMCP + 2,4-D 0.54 lb ai/a Jul 8, 2013 (4 WAT)
19 AMCP + triclopyr lb ai/a Jul 8, 2013 (4 WAT) AMCP + chlorsulfuron 1.38 oz ai//a Jul 8, 2013 (4 WAT)
20 % Stand Reduction Coastal Bermudagrass Tolerance to AMCP Combinations at Initial Greenup <2 Growth lsd (p=.05) AMCP 2 oz ai/a AMCP + metsulfuron oz ai/a AMCP + 2,4-D oz ai/a 10 AMCP + triclopyr oz ai/a 0 12 DAT 27 DAT 41 DAT 55 DAT 2010: Wake County Check Applied Apr 7 NIS at 0.25% v/v
21 Lbs green wt / acre Coastal Bermudagrass Tolerance to AMCP Combinations at Initial Greenup <2 Growth lsd (p=.05) AMCP 2 oz ai/a AMCP + metsulfuron oz ai/a AMCP + 2,4-D oz ai/a AMCP + triclopyr oz ai/a Jun 2010: Wake County Check Applied Apr 7 NIS at 0.25% v/v
22 % Stand Reduction Coastal Bermudagrass Tolerance to AMCP Combinations at 6-8 Growth lsd (p=.05) AMCP 2 oz ai/a AMCP + metsulfuron oz ai/a AMCP + 2,4-D oz ai/a 10 AMCP +triclopyr oz ai/a 0 14 DAT 28 DAT 65 DAT 2010: Wake County Check Applied May 4 NIS at 0.25% v/v
23 Lbs green wt / acre Coastal Bermudagrass Tolerance to AMCP Combinations at 6-8 Growth lsd (p=.05) 9-Jun 2010: Wake County AMCP 2 oz ai/a AMCP + metsulfuron oz ai/a AMCP + 2,4-D oz ai/a AMCP + triclopyr oz ai/a Check Applied May 4 NIS at 0.25% v/v
24 % Stand Reduction Coastal Bermudagrass Tolerance to AMCP Combinations at or 10 Days after 1 st Cut lsd (p=.05) AMCP 2 oz ai/a AMCP + metsulfuron oz ai/a AMCP + 2,4-D oz ai/a AMCP + triclopyr oz ai/a AMCP 2 oz ai/a Jun / 3 DAT 30 / 19 DAT 2010: Wake County Check Applied Jun 8 or Jun 19 NIS at 0.25% v/v
25 % Necrosis Tall Fescue Tolerance to AMCP Combination Products LSD p=.05 1 WAT 2 WAT 4 WAT 8 WAT NCSU Beef Unit: chlorsulfuron 1.38 oz ai/a + metsulfuron 1.28 oz ai/a AMCP 0.5 oz ai/a + 2,4-D 1.3 lb ai/a AMCP + thifensulfuron oz ai/a AMCP + tribenuron oz ai/a Aminopyralid 0.11 lb ai/a Check Applied May 21 NIS at 0.25%
26 Lb dry wt/a Tall Fescue Yield Effects to AMCP Combination Products ns ns LSD p= Jul 30-Sep NCSU Beef Unit: chlorsulfuron 1.38 oz ai/a + metsulfuron 1.28 oz ai/a AMCP 0.5 oz ai/a + 2,4-D 1.3 lb ai/a AMCP + thifensulfuron oz ai/a AMCP + tribenuron oz ai/a Aminopyralid 0.11 lb ai/a Check Applied May 21 NIS at 0.25%
27 Concentration - PPM (mg/kg) Turfgrass Clipping Residues Average of 2 Field Trials at NC State ( ) Aminocyclopyrachlor Clopyralid Days After Application
28 Conclusions Winter Weed Trial AMCP + metsulfuron or chlorsulfuron: complete control of henbit, narrowleaf vetch, Carolina geranium, shepherds-purse, mouseear chickweed, oldfield toadflax and corn speedwell AMCP + 2,4-D: no control of mouseear chickweed, oldfield toadflax and corn speedwell Summer Weed Trial AMCP + 2,4-D, metsulfuron, chlorsulfuron or triclopyr: complete control of arrowleaf sida 4 WAT but new germination occurred by 8 WAT
29 Conclusions Coastal Bermuda Yield Trial AMCP at 2 oz ai/a or with metsulfuron, 2,4-D or triclopyr did not affect yield when treated at initial greenup AMCP at 2 oz ai/a or with metsulfuron caused 30% stand (1 MAT) and yield reduction when applied to 6-8 inch new spring growth; AMCP with 2,4-D or triclopyr caused 20% stand reduction 1 MAT but did not affect yield All treatment combinations reduced bermudagrass stand <10% at 4 WAT when applied 10 days after 1 st cut
30 Conclusions Tall Fescue Yield Trial AMCP + chlorsulfuron or metsulfuron caused tall fescue necrosis 15 or 37%, respectively, 4 WAT with recovery by 8 WAT; tall fescue yield was not affected AMCP + 2,4-D, thifensulfuron or tribenuron caused no tall fescue injury or yield reduction
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