Weed Management Update: Vegetable Crops. Jed Colquhoun and Dan Heider University of Wisconsin
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1 Weed Management Update: Vegetable Crops Jed Colquhoun and Dan Heider University of Wisconsin
2 Snap Bean Acetochlor plant back to snap bean Surpass label
3 IR-4 Acetochlor/Snap Bean Field trials began in 2009 Appl. of 3.0 lb ai/a at 270 and 300 days prior to planting snap bean (4 sites) Residues must be <0.1 PPM Field trials began in 2012 WI, OH, GA, AR è planted & harvested in 2013 Samples at lab
4 Prometryn Carrot Caparol 4L (Syngenta), Vegetable Pro (MANA) Active ingred: Prometryn (Syngenta, others) photosynthetic inhibitor Activity: both contact burndown and residual Weed spectrum: broad, including ragweeds, smartweeds, pigweeds, lambsquarters, barnyardgrass, crabgrass and foxtail spp.
5 2013 Carrot Active Ingredient Herbicide Rate Notes Linuron Lorox Varies by soil type PRE + POST Pendimethalin Prowl H pt/a PRE S-Metolachlor Dual Magnum (24C) Varies by soil type PRE Trifluralin Treflan pt/a PPI Metribuzin Several avail. Max. 0.5 lb ai/a POST Prometryn Caparol 4L Varies by timing Fluazifop-P-butyl Fusilade pt/a Post grasses Clethodim Select Varies by formul. Post grasses Sethoxydim Poast pt/a Post grasses Future? Active Ingredient Herbicide Rate Notes DCPA Dacthal FL 2.0 pt/a PRE Ethofumesate Ethotron SC qt/a PRE + POST
6 Garden Beet 2013 Active Ingredient Herbicide Rate Notes Cycloate Ro-Neet 6E gal/a PPI - grasses Pyrazon Pyramin DF lb/a PRE - bdlves S-Metolachlor Dual Magnum (24C) pt/a PRE grass/bdlves Ethofumesate Nortron SC/Ethotron SC oz/a PRE + POST Desmedipham Alphanex pt/a POST - bdlves Phenmedipham Spin-Aid POST bdlves Des+Phenmedipham Phen-Des pt/a POST bdlves Clopyralid Stinger pt/a POST - bdlves Sethoxydim/Clethodim Poast/Select vaires POST - grasses Triflusulfuron-methyl UpBeet 0.5 oz/a POST - bdlves Not RRPW Not RRPW
7
8 Dual Magnum
9 Upbeet
10 Beet Herbicide Efficacy Trials Locations: Arlington Ag Research Station Mortenson Bros. Farm Plover, WI Plover Location Soil Type: Meehan Loamy Sand; OM % Varieties: Ruby Queen, Detroit Supreme, Red Ace, Red Titan Date Planted: 5/20/13 Row Spacing: 19 (avg.) Plot Design: 6 x 20, 4 Reps with each beet variety comprising one row of the plot Rating Dates: 6/10, 6/18, 6/24, 7/1, 7/8, 8/14 Harvest: 8/23/13
11 2-LF + 1 wk. 2-LF + 2 wk. 4-LF + 1 wk. Untreated Check 6-LF + 1 wk. RQ DS RA RT
12 2-LF + 1 wk. 2-LF + 2 wk. 4-LF + 1 wk. Dual Magnum 0.75 PT/A PRE Ethotron 40 OZ/A PRE Ethotron 5.25 OZ/A 2-LF Upbeet 0.13 OZ/A 2-LF COC 0.25 % V/V 2-LF Spin-Aid 12 OZ/A 4-LF Ethotron 3 OZ/A 4-LF Upbeet 0.13 OZ/A 4-LF Stinger 4 OZ/A 4-LF Spin-Aid 16 OZ/A 6-LF Ethotron 4 OZ/A 6-LF Upbeet 0.25 OZ/A 6-LF Stinger 4 OZ/A 6-LF 6-LF + 1 wk. RQ DS RA RT
13 2-LF + 1 wk. 2-LF + 2 wk. 4-LF + 1 wk. Ro-Neet 4 PT/A PPI Ethotron 1 PT/A PRE Ethotron 5.25 OZ/A 2-LF Upbeet 0.13 OZ/A 2-LF COC 0.25 % V/V 2-LF Spin-Aid 12 OZ/A 4-LF Ethotron 3 OZ/A 4-LF Upbeet 0.13 OZ/A 4-LF Stinger 4 OZ/A 4-LF Spin-Aid 16 OZ/A 6-LF Ethotron 4 OZ/A 6-LF Upbeet 0.25 OZ/A 6-LF Stinger 4 OZ/A 6-LF 6-LF + 1 wk. RQ DS RA RT
14 2-LF + 1 wk. 2-LF + 2 wk. 4-LF + 1 wk. Zidua 0.5 OZ/A PRE Ethotron 5.25 OZ/A 2-LF Stinger 4 OZ/A 2-LF MSO 0.63 % V/V 2-LF Ethotron 5.25 OZ/A 4-LF Stinger 4 OZ/A 4-LF MSO 0.63 % V/V 4-LF 6-LF + 1 wk. Zidua ai: Pyroxasulfone BASF 0.85 WG Root & shoot inhibitor mode of action Controls a number of grasses and broadleaves including pigweed species (common, smooth, waterhemp) RQ DS RA RT
15 2-LF + 1 wk. 2-LF + 2 wk. 4-LF + 1 wk. Dual Magnum 0.75 PT/A PRE Ethotron 40 OZ/A PRE Chateau 1 OZ/A 2-LF NIS 0.25 % V/V 2-LF 6-LF + 1 wk. RQ DS RA RT
16 Top-yielding treatments across all varieties 4 Ro-Neet 6 EC 4 PT/A PPI Ethotron 4 SC 1 PT/A PRE Ethotron 4 SC 5.25 OZ/A 2-LF Upbeet 50 WDG 0.13 OZ/A 2-LF COC L 0.25 % V/V 2-LF Spin-Aid 1.3 EC 12 OZ/A 4-LF Ethotron 4 SC 3 OZ/A 4-LF Upbeet 50 DF 0.13 OZ/A 4-LF Stinger 3 SL 4 OZ/A 4-LF Spin-Aid 1.3 EC 16 OZ/A 6-LF Ethotron 4 SC 4 OZ/A 6-LF Upbeet 50 DF 0.25 OZ/A 6-LF Stinger 3 SL 4 OZ/A 6-LF 7 Dual Magnum 7.62 EC 0.75 PT/A PRE Ethotron 4 SC 1 PT/A PRE Ethotron 4 SC 3 OZ/A 2-LF Spin-Aid 1.3 EC 12 OZ/A 2-LF Upbeet 50 WDG 0.13 OZ/A 2-LF Spin-Aid 1.3 EC 12 OZ/A 4-LF Ethotron 4 SC 3 OZ/A 4-LF Upbeet 50 DF 0.13 OZ/A 4-LF Stinger 3 SL 4 OZ/A 4-LF Spin-Aid 1.3 EC 16 OZ/A 6-LF Ethotron 4 SC 4 OZ/A 6-LF Upbeet 50 DF 0.25 OZ/A 6-LF Stinger 3 SL 4 OZ/A 6-LF 5 Dual Magnum 7.62 EC 0.75 PT/A PRE Ethotron 4 SC 40 OZ/A PRE Ethotron 4 SC 5.25 OZ/A 2-LF Upbeet 50 WDG 0.13 OZ/A 2-LF COC L 0.25 % V/V 2-LF Spin-Aid 1.3 EC 12 OZ/A 4-LF Ethotron 4 SC 3 OZ/A 4-LF Upbeet 50 DF 0.13 OZ/A 4-LF Stinger 3 SL 4 OZ/A 4-LF Spin-Aid 1.3 EC 16 OZ/A 6-LF Ethotron 4 SC 4 OZ/A 6-LF Upbeet 50 DF 0.25 OZ/A 6-LF Stinger 3 SL 4 OZ/A 6-LF 8 Dual Magnum 7.62 EC 0.75 PT/A PRE Spin-Aid 1.3 EC 1 PT/A 2-LF Ethotron 4 SC 5.25 OZ/A 2-LF Spin-Aid 1.3 EC 1.5 PT/A 4-LF Ethotron 4 SC 5.25 OZ/A 4-LF Ethotron 4 SC 10.5 OZ/A 6-LF Stinger 3 SL 6 OZ/A 6-LF Upbeet 50 WDG 0.5 OZ/A 6-LF COC L 0.25 % V/V 6-LF
17 Lessons from 2013 garden beet trials The loss of a.i. desmedipham (Alphanex, Betanex) is not catastrophic Varietal response to herbicides generally minor Exception: Curbit/Detroit Supreme Triflusulfuron-methyl (UpBeet) provided excellent velvetleaf control Clopyralid (Stinger) in a single appl. had increased crop safety over a split-appl.
18 Simulated off-target synthetic auxins in vegetables Synthetic auxin-resistant agronomic crops currently in regulatory evaluation If approved, anticipated commercial use within a couple of seasons Specialty crop producers concerned about offtarget movement
19 Off-target synthetic auxins: vegetable research summary Observations of visible injury aren t a good indicator of yield or quality risk Regardless of visible injury, harvested crop is subject to pesticide residue limits Stewardship programs must also consider weed resistance, not just off-target risks
20 Common waterhemp 35,840 g ha -1 1,120 g ha -1 Photo courtesy Univ. of Nebraska, Kruger
21 Susceptible Population Resistant Population Photo courtesy Univ. of Nebraska, Kruger ,4-D dose, g ae ha -1
22 Seed potatoes: glyphosate and other herbicides REMEMBER! Spraying glyphosate? GLYPHOSATE DAMAGE Watch out for seed potato crops! More info in the Potato Councilʼs leaflet: Advice on the safe use of Glyphosate Potato Council is part of the Agricultural Horticultural Development Board (AHDB) USE PESTICIDES SAFELY - READ THE LABEL EVERY TIME
23 UWEX Publications
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