6th Blight Update and Seasonal Outlook for Nova Scotia- May 10, 2022

Tuesday, May 10, 2022

Sprout Field Development Update

I got a report from Yarmouth county and we start to see plants push through the ground in those areas. I compared local accumulation GDD in this area (GDD- 260 on May 10) which is close to the predicted plant emergence start GDD requirement (GDD- 270). Some variation is expected. I expect other early developing areas in the central area would start to see plant emergence later this week.

 (Photo Credit: Peter Van Dyk)


Wild Blueberry Floral Bud F2 Stage and Monilinia Infection Periods 

I don’t have many new numbers to share (Table 1) as most areas I was able to get to in the last few weeks were above the 40-50% F2 stage, and I didn’t get a chance to visit Pictou, Antigonish and Guysborough counties.

I spoke with growers from those late areas and we are looking at an average of 20-30% F2, but with the warm temperatures this week, I expect those late areas will get to 40% soon.

For all fields with 40% or more F2 stage, it looks like there could be a long infection period, starting Sunday, May 15, till next Tuesday, May 17 (Table 2). That forecast information is from weather stations we have in wild blueberry fields. According to the weather network, next week could be a wet week as well. Please keep monitoring your field and local weather, and be prepared for the upcoming infection period. Your first monilinia application usually is good for 7-10 days and the second application is recommended if any wetness period is coming after this first 7-10 days protection window.

Please see the below summary table of the percentage of wild blueberry floral bud at the F2 stage. You can also click on this map to check those numbers. Detailed information is also available under the Wild Blueberry Blog- GDD& Phenology Tracker.

Table 1. Percentage of Wild Blueberry Floral Bud F2 stage

*light green (0-20% F2)dark green (20-30% F2)yellow (30-40% F2) and red (40-100% F2)

*Once the areas and fields get to 40% F2 or above, I will stop updating numbers as I can focus on other areas. Once you are at or above 40%, please monitor your local weather and make a management decision.


Wild blueberry production regions, NS

The average percentage of floral buds at F2



Cape Breton




Cumberland County


Oxford (early field)

May 9- 65%

Mapleton (Lynn Mt.)

May 9- 61%

Halfway River

April 26- 40%

Lower Greenville

April 25- 15%

Westchester Station

April 25- 17%


May 2- 40%


May 3- 41.2%

Diligent River flat

May 5- 10-15%


May 2- 40%

New Canaan

May 5- 40%


May 3- 34.7%

Windham Hill

May 3- 13.8%

Prospect and Newville Rd. area

May 5- 30-35%

York Settlement/ Glasgow Mt.

May 5- 30-35%

Fox Point

May 5- 20%



South West Nova Scotia


Queens County

April 23- 42%

Digby County

April 29- 50%

Annapolis County

April 29- 50%



Hants County




Halifax County




Guysborough County




Colchester County


Murray Siding

May 9- 85%


May 9- 51%


May 9- 57%

Debert (WBPANS office)

May 2- 44%

Debert (Debert Airport)

May 2- 45%

Debert (near the railway track)

May 2- 40%

Baseline Rd.

May 2- above 40%


May 6- 50%


May 2- 40%


May 2- 40%

Highland Village

May 2- 27%

Great Village

May 2- 27%

Tatamagouche Mt.

May 2- 17%


May 9- 20%



Pictou and Antigonish County


New France

May 9- 10%


April 27- 5%

Mt Thom

April 27- 12%


April 27- 15%

Sunny Brae

April 28- 5%

*Thanks to everyone who contributed information and a special thank you to staff from the Bragg group (Roy Hunter and Richard Langille) who share information with me weekly.


Table 2. Weather Forecast for Potential Wetness and Monilinia Infection Periods

Weather Station and Location

Potential Wetness and Monilinia Infection Periods

*ONLY when your field is at or above 40%!!!

*Predict period: May 11-17; reported date: May 10



Glenholme (NSW001)

May 15-17

Murray Siding (NSW002)

May 15-17

Upper Kemptown (NSW022)

May 12-17

Kavanaugh Mills (NSW023)

May 15-17

Debert (NSW036)

May 15-17

Belmont (NSW037)

May 15-17

Staples Brook (NSW038)

May 15-17





Wyvern (NSW003)

May 15-17

Oxford (NSW005)

May 15-17

Halfway River (NSW039)

May 15-17





Blue Mountain (NSW017)

May 14-17

Sunny Brae (NSW018)

May 14-17

New Gairloch (NSW019)

May 14-17

Keble (NSW020)

May 15-17

Four Mile Brook (NSW021)

May 14-17

College Grant (NSW040)

May 15-17



*Weather source: weather stations in wild blueberry fields (http://www.novascotiawildblueberryblog.com/p/weather.html)