Sclerotinia window and pre-harvest interval

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

Product	Company	Group	Active Ingredient	Rate (per acre)	Application stage
Acapela	1	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.
Azoshy250 SC	2	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
Cotegra	4	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
Dyax	5	BASF Canada	7, 11	250 g/L of fluxapyroxad, 250 g/L of 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
Evito 480	6	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.
Lance AG	7	BASF Canada	7, 11	70% boscalid (A); 250 g/L of pyraclostrobin (B)	132 mL (A); 140 g (B)	20 - 50% bloom
Lance WDG	8	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
Miravis Bold	9	Syngenta Canada Inc.	7	200 g/L of pydiflumetofen	405 mL	10 - 50% bloom
Priaxor	11	BASF Canada	7, 11	167 g/L of fluxapyroxad, 333 g/L of pyraclostrobin	180 mL	20 - 50% bloom
Proline 480 SC	13	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.
Proline Gold	14	Bayer	3, 7	200 g/L of fluopyram, 200 g/L of prothioconazole	253 mL	20 - 50% bloom, prior to petal drop
Quadris	15	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
Quash SC	17	Valent Canada distributed by Nufarm Agriculture Inc.	3	480 g/L of metconazole	59 to 118 mL	20 - 50% bloom; Use high rate under high disease pressure. Do not make more than one application per year
Quasi	18	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
Serenade OPTI	25	Bayer	44	1.31 x 10^10 CFU/g Bacillus subtilis (QST 713 strain)	0.1 - 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
SHAFT Fungicide	27	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
Holdfast	21	WinField United Canada	3	480 g/L prothioconazole	125 to 150 mL2 (for 480 g/L products)	20 - 50% bloom, prior to petal fall. Use high rate if history of heavy disease or dense crop stand
Serenade SOIL	26	Bayer	44	1 x 10^9 CFU/g Bacillus subtilis (QST 713 strain)	0.4 to 1.6 L	20 - 30% bloom
EMISSARIUS	24	UAP Canada	11	250 g/L azoxystrobin	280 to 400 mL	prior to 30% bloom
Soratel	23	ADAMA	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
Viatude	29	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)
Advantage Prothioconazole 480 SC	31	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.
Joust	32	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.
LALSTOP Contans WG	33	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)
Maxentis	34	Adama Agricultural Canada	3, 11	120 g/L azoxystrobin, 90 g/L prothioconazole	443 mL	20 - 50% bloom
Miravis Star	35	Syngenta Canada Inc	7, 12	150 g/L fludioxinil, 100 g/L pydiflumetofen	400 mL	10 - 50% bloom
Pavise 480SC	36	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
Razor 250 SC	37	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
VIKING Azoxystrobin	38	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

More…

Does fungicide at 50% flower make sense?
Top 10 sclerotinia stem rot questions
Factors in the sclerotinia spray decision
Sclerotinia spray window and pre-harvest intervals
Sclerotinia stem rot chapter in Canola Encyclopedia

Sclerotinia window and pre-harvest interval

Fungicides for sclerotinia stem rot management

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