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The window for fungicide application closes after 50 per cent flower – which is when the field is at its most yellow. Once this “full bloom” starts to wane, spraying must stop.
By this time, infection that will cause the major economic damage is already done. Also, and this is very important, applications after 50 per cent flower are not on fungicide labels and may not comply with the pre-harvest interval for some fungicides. This could result in fungicide residue on harvested seed. Check the interactive Spray to Swath Interval Calculator for pre-harvest intervals for each product.
Fungicides for sclerotinia stem rot management
| wdt_ID | Product | Company | Group | Active Ingredient | Rate (per acre) | Application stage |
|---|---|---|---|---|---|---|
| 1 | Acapela | Corteva Agriscience | 11 | 250 g/L picoxystrobin | 325 to 485 mL | 20 - 50% bloom; Under high disease pressure make second application 7 - 14 days later with difference from difference fungicide group. |
| 2 | Advantage Prothioconazole 480 SC | Advantage Crop Protection Inc | 3 | 480 g/L prothioconazole | 125 to 150 mL | 20 - 50% bloom, prior to petal drop. Use high rate if history of heavy disease or dense crop stand. |
| 4 | Azoshy 250 SC | Sharda Crop Chem Canada | 11 | 250 g/L azoxystrobin | 280 to 400 mL | prior to 30% bloom; Use higher rate with past sclerotinia history in area and when conditions favour development |
| 5 | Cotegra | BASF Canada | 3, 7 | 250 g/L boscalid, 150 g/L prothioconazole | 240 to 280 mL | 20 - 50% bloom. Rate is determined by relative disease pressure and risk of disease development. Apply second application 7 - 14 days later if disease risk persists |
| 6 | Dyax | BASF Canada | 7, 11 | 250 g/L fluxapyroxad, 250 g/L pyraclostrobin | 120 to 160 mL | 20 - 50% bloom. Use high rate under high disease pressure. If disease risk persists, make a second application 10 - 14 days later with a different mode of action |
| 7 | Emissarius | UAP Canada | 11 | 250 g/L azoxystrobin | 280 to 400 mL | prior to 30% bloom |
| 8 | Evito 480 SC | UPL AgroSolutions Canada Inc. | 11 | 480 g/L fluoxastrobin | 59 to 118 mL | 20 - 50% bloom, or prior to petal drop. Follow with second application as needed on a 7 - 14 day interval. Use high rates and shorter interval if disease pressure is high. |
| 9 | Gauntlet | Nufarm Agriculture | 3,11 | 150 g/L azoxystrobin, 150 g/L prothioconazole | 400 mL | 10 - 50% bloom |
| 11 | Joust | NuFarm Agriculture | 3 | 250 g/L prothioconazole | 240 to 280 ml | 20 - 50% bloom, prior to petal drop. Use high rate if history of heavy disease or dense plant stand. |
| 13 | LALSTOP Contans WG | Lallemand Plant Care, distributed by UAP | Biofungicide | 5.00% Coniothyrium minitans strain, minimum 1x10^9 CFU/g | 400 to 800 g (when incorporated in top 5 cm of topsoil), 800 to 1600 g (when incorporated into soil deeper than 5 cm) | preplant and post harvest (3 months before onset of disease symptoms if treated in the spring). Incorporation should take place as soon as possible after application (within 1 week) |
| 14 | Lance AG | BASF Canada | 7, 11 | 70% boscalid (A); 250 g/L of pyraclostrobin (B) | 132 mL (A); 140 g (B) | 20 - 50% bloom |
| 15 | Lance WDG | BASF Canada | 7 | 70% boscalid | 140 g | 20 - 50% bloom. Apply a second time 7 - 14 days later up to full bloom if disease persists or if weather conditions are favoruable for disease development |
| 17 | Maxentis | Adama Agricultural Canada | 3, 11 | 120 g/L azoxystrobin, 90 g/L prothioconazole | 443 mL | 20 - 50% bloom |
| 18 | Miravis Bold | Syngenta Canada Inc. | 7 | 200 g/L pydiflumetofen | 405 mL | |
| 25 | Proline 480 SC | Bayer | 3 | 480 g/L prothioconazole | 125 to 150 mL | 20 - 50% bloom, prior to petal drop. Use high rate if history of heavy disease or dense crop stand. |
| 27 | Quadris | Syngenta Canada | 11 | 250 g/L azoxystrobin | 280 to 400 mL | prior to 30% bloom; Use high rate if there is history of sclerotinia in the area or conditions favour disease development |
| 21 | Miravis Star | Syngenta Canada Inc | 7, 12 | 150 g/L fludioxinil, 100 g/L pydiflumetofen | 400 mL | 10 - 50% bloom |
| 46 | SHAFT Fungicide | Sharda Crop Chem Canada | 7 | 70% Boscalid (wettable granule) | 140 g | 20 - 50 % bloom. Make a second application 7 - 14 days later if disease persists or if weather conditions are favourable for disease |
| 26 | Proline Gold | Bayer | 3, 7 | 200 g/L fluopyram, 200 g/L prothioconazole | 253 mL | 20 - 50% bloom, prior to petal drop |
| 24 | Priaxor | BASF Canada | 7, 11 | 167 g/L fluxapyroxad, 333 g/L pyraclostrobin | 180 mL | 20 - 50% bloom |
| 23 | Pavise 480SC | Albaugh | 3 | 480 g/L prothioconazole | 125 to 150 mL | 20 - 50% bloom, prior to petal fall. Use high rate if history of heavy disease or dense crop stand |
| 29 | Quash SC | Valent Canada distributed by Nufarm Agriculture Inc. | 3 | 480 g/L metconazole | 59 to 118 mL | 20 - 50% bloom; Use high rate under high disease pressure. Do not make more than one application per year |
| 48 | Viatude | Corteva Agriscience | 3, 11 | 187.5 g/L picoxystrobin, 62.5 g/L prothioconazole | 0.3L or 300 ml | Begin applications before or at onset of infection. 20% - 30% bloom (no later than 50% bloom) |
| 31 | Quasi | AgraCity Crop & Nutrition Ltd. | 11 | 250 g/L azoxystrobin | 280 to 400 mL | prior to 30% bloom; Use high rate if there is history of sclerotinia in the area or conditions favour disease development |
| 45 | Serenade SOIL | Bayer | 44 | 1 x 10^9 CFU/g Bacillus subtilis (QST 713 strain) | 0.4 to 1.6 L | 20 - 30% bloom |
| 32 | Rambler | NewAgco Inc by AgraCity | 3 | 480 g/L prothioconazole | 128 to 149 mL | 20 - 50% bloom, prior to petal drop. Use high rate if history of heavy disease or dense crop stand. |
| 51 | Zetigo PRM | Corteva Agrisciences | 11, 21 | 50 g/L florylpicoxamid, 100 g/L pyraclostrobin | 324 to 405 mL | Apply prior to the onset of disease, typically around the 20 - 50% bloom stage |
| 49 | VIKING Azoxystrobin | Viking Crop Production Partners Inc | 11 | 250 g/L azoxystrobin | 280 to 400 mL | prior to 30% bloom, use high rate if there is history of sclerotinia in the area or conditions favour disease development |
| 50 | VIKING Prothioconazole | Viking Crop Production Partners Inc | 3 | 480 g/L prothioconazole | 240 to 280 mL | 20 - 50% bloom, prior to petal drop. Use high rate if history of heavy disease or dense crop stand. |
| 47 | Taj | Sharda Crop Chem | 3 | 480 g/L prothioconazole | 240 to 280 mL | 20 - 50% bloom, prior to petal drop. Use high rate if history of heavy disease or dense crop stand. |
| 44 | Serenade OPTI | Bayer | 44 | 1.31 x 10^10 CFU/g Bacillus subtilis (QST 713 strain) | 0.1 to 0.4 kg/ac | 20-30% bloom; Use high rates if there is history of heavy disease pressure, a second application may be made at 50% bloom 7 - 10 days later prior to significant petal drop |
| 43 | Razor 250 SC | Albaugh | 11 | 250 g/L azoxystrobin | 280 to 400 mL | prior to 30% bloom, use high rate if there is history of sclerotinia in the area or conditions favour disease development |