Re-Cropping Intervals for Potatoes. Product Trade Name
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1 s for Potatoes Potatoes are sensitive to residues left in the soil by a range of commonly used herbicides. These residues may alter the appearance of the foliage of the potato crop, interfere with normal root development, reduce crop yields and cause abnormalities in the harvested tubers. Herbicide carry over is especially problematic In potato fields planted for use as seed - as the herbicides may impair the performance of the seed crop in the next growing season. The duration of time over which herbicide residues may remain at damaging levels in the soil is determined by the chemistry of the herbicide, the rate, timing and method of herbicide application, soil properties, tillage practices and weather conditions in years following treatment. Repeated applications of the same herbicide or related products can result in cumulative effects. ** The information provided in this document represents a guide only and reflects information available at the time of publication (February 2016). Growers are urged to consult with extension staff and product manufacturers for more information on safe re-cropping intervals. 2,4-D 2,4-D 0 Aatrex atrazine 2-5 Accent (Challenger) nicosulfuron 2 Bioassay is recommended Aim carfentrazone 0 Altitude imazamox + fluroxypyr + MCPA 2 Altitiude FX imazamox + fluroxypyr + MCPA + clopyralid Amitrol 240 amitrole 1 Ares imazamox + imazapyr 2 Assert imazamethabenz + furasulam + MCPA 2 Authority sulfentrazone 2-4 Avadex triallate Recropping interval depends on rate applied and past history of applications. Biossay recommended Addition of clopyralid extends re-cropping interval, especially for seed potatoes Length of recropping period increases with drought and high soil ph. As of February 2016 Page 1 of 7
2 s for Potatoes Axial pinoxaden Axial Extreme pinoxaden + fluroxypyr 2 Barricade thifensulfuron + tribenuron + fluroxypyr 2 Basagran bentazon 0 Blackhawk 2,4-D + carfentrazone 0 Blazer acifluorfen 0 Broadband pinoxaden + florasulam Bromoxynil (+ MCPA or 2,4-D) bromoxynil 0 Cleanstart glyphosate + carfentrazone 0 Clethodim (Select, Centurion, Arrow) clethodim 0 Clever quinclorac 2-4 Clodinafop (Signal, Horizon, NextStep etc) clodinafop 0 Length of recropping period increases with drought and low soil organic matter. Biossay recommended Curtail M clopyralid + MCPA 2-4 Longer recropping period refers to seed potatoes Dicamba (+ mecoprop + MCPA) dicamba (+ mecoprop + MCPA) 0 Diclorprop + 2,4-D diclorprop + 2,4-D 0 Diquat diquat 0 Distinct dicamba + diflufenzopyr 0 Dual II Magnum metolachlor 0 Dyvel dicamba + MCPA 0 As of February 2016 Page 2 of 7
3 s for Potatoes Eclipse III clorpyralid + glyphosate 2-4 Longer recropping period refers to seed potatoes Edge ethafluralin 1 Enforcer fluroxypyr + 2,4-D + bromoxynil 2 Enforcer M fluroxypyr + MCPA + bromoxynil 2 Eptam EPTC 0 Ecscort metsulfuron 4 High soil ph increases recropping risk. Bioassay recommended Everest flucarbazone + fluroxypyr 2 Length of recropping period increases with drought Express Pro tribenuron + metsulfuron 4 High soil ph increases recropping risk. Bioassay recommended Fonoxaprop (Puma, HellCat, Vigil, Cougar) Florasulam + 2,4-D (Frontline, Spitfire) fenoxaprop 0 florasulam + 2,4-D 1 Florasulam + Curtail M florasulam + clopyralid + MCPA 2-4 Longer recropping period refers to seed potatoes Flucarbazone (Everest, Sierra) flucarbazone 1 Flumioxazin (Chateau, Valtera) flumioxazin 1 Fluroxypyr + 2,4-D (Attain, Rush, Flurox) fluroxypyr + 2,4-D 2 Focus carfentrazone + pyroxasulfone 1 Fortress trifluralin + triallate 1 Frontier dimethamid 0 Glyphosate glyphosate 0 As of February 2016 Page 3 of 7
4 Glufosinate (Good Harvest, Liberty) s for Potatoes glufosinate 0 Gramoxone gramoxone 0 Grazon picloram + 2,4-D 5 Extremely persistent Harmony K Heat clodinafop + thifensulfuron + tribenuron + dicamba saflufenacil Imazamethabenz (Asset, Avert) imazamethabenz 2 1 Imazathapyr (Pursuit, Phantom, Gladiator, Multistar, Kamikaze) imazethapyr 2 Inferno flucarbazone + tribenuron 1 Infinity bromoxynil + pyrasulfatole 1 Kerb propyzamide 0 Ko-Act tribenuron + 2,4-D 0 Korrex florasulam + dicamba 1 Linuron (Lorox, Linuron) linuron 0 Lontrel clopyralid 2-4 Longer recropping period refers to seed potatoes MCPA MCPA 0 Mecoprop mecoprop 0 Metribuzin (Sencor) metribuzin 0 Metsulfuron (Ally, Accurate) metsulfuron 4 High soil ph increases recropping risk. Bioassay recommended Momentum clopyralid + fluroxypyr 2-4 Longer recropping period refers to seed potatoes As of February 2016 Page 4 of 7
5 s for Potatoes Muster ethametsulfuron 3 Bioassay recommended Odyssey (Ultra) imazamox + imazethapyr 2 Optica Trio MCPA + mecoprop + dichlorprop 0 Outlook dimethanamid 0 Overdrive dicamba + diflufenzopyr 0 Paradigm florasulam + halauxifen Permit halosurfuron 1 Pinnacle thifensulfuron 1 Pixxaro halauxifen + fluroxypyr + MCPA 2 Poast sethoxydim 0 Prestige fluroxypyr + clopyralid + MCPA 2-4 Longer recropping period refers to seed potatoes Primextra II Magnum metolachlor + atrazine 2-4 Prism rimsulfuron 0 Pulsar dicamba + fluroxypyr 2 Quizalofop (Assure, Yuma) quizalofop 0 Recropping interval depends on rate applied and past history of applications. Biosassay recommended Reclaim metsulfuron + aminopyralid + 2,4-D 4 High soil ph increases recropping risk. Bioassay recommended Restore II aminopyralid + 2,4-D 4 High soil ph increases recropping risk. Bioassay recommended Retain SG thifensulfuron + tribenuron + fluroxypyr + 2,4-D Reward diquat 0 2 As of February 2016 Page 5 of 7
6 s for Potatoes Salute imazamox + imazapyr + clopyralid 2-4 Simazine (Princep 9) simazine 4 Simplicity pyroxsulam 0 Solo imazamox 2 High soil ph and drought extend recropping period. Bioassay recommended Stellar florasulam + fluroxypyr + MCPA 2 Tandem pyroxsulam + fluroxypyr 2 Tensile imazamox + clopyralid 2-4 Thifensulfuron/tribenuron (Refine, Deploy, Nimble) thifensulfuron + tribenuron 1 Topramezone topramazone 0 Tordon picloram 5 Extremely persistent Tralkoxydim tralkoxydim 0 Traxos pinoxaden + clodinafop 0 Tribenuron (Express, Spike, Nuance, Inferno, FirstStep) Trifluralin (Treflan, Rival, Bonanza) tribenuron 1 trifluralin 1 Triton C thifensulfuron + tribenuron + quinclorac 2-4 Triton K tribenuron + dicamba + 2,4-D 1 Length of recropping period increases with drought and low soil organic matter. Biossay recommended As of February 2016 Page 6 of 7
7 s for Potatoes Trophy fluroxypyr + MCPA 2 Tundra fenoxaprop + bromoxynil + pyrasulfatole 0 Varro thiencarbazone 2 Velocity thiencarbazone + bromoxynil + pyrasulfonate Velpar hexazione 3-5 Bioassay recommended Viper imazamox + bentazon 2 2 Insufficient information available to make recommendation 0 = OK to plant potatoes next crop year 1 = do not plant potatoes next crop year, but OK after that 2, 3, 4 or 5 = wait for 2, 3, 4 or 5 years (as noted) full cropping seasons before planting potatoes Sources of Information Explanation of Recropping s Bioassay = plant a test strip of potatoes in the field a year ahead of the planned crop Length of recommended recropping interval may be extended for seed potatoes as herbicide residues may alter the way the crop canopy looks which interferes with inspections required for seed potato certification. a) Michigan State Co-operative Extension Bull ( b) North Dakota Crop Rotation Restrictions ( c) 2015 Guide to Crop Protection - Government of Saskatchewan As of February 2016 Page 7 of 7
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