4th Blight Update and Seasonal Outlook for Nova Scotia- May 3, 2022

Tuesday, May 3, 2022

 This is our fourth Monilinia update for 2022.

Wild Blueberry Floral Bud F2 Stage

In Colchester and Cumberland counties, the majority of average-development fields are at or above 40% F2, however, those traditional late fields, such as the eastern part of the province and other fields located in higher elevations might still be delayed. Please see updates below.

As those areas came to a 40% F2 point, I will stop updating numbers once they are in “red (40% F2 point)” and move to other late areas and counties.

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



May 2- 35%

Mapleton (Lynn Mt.)

May 2- 30%

Halfway River

April 26- 40%

Lower Greenville

April 25- 15%

Westchester Station

April 25- 17%


May 2- 40%


May 3- 41.2%

Diligent River

April 27- 5%


May 2- 40%

New Canaan

May 2- 32%


May 3- 34.7%

Windham Hill

May 3- 13.8%



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 2- 47%


May 2- 15.3%


May 2- 28%

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 2- 31%


May 2- 40%


May 2- 40%

Highland Village

May 2- 27%

Great Village

May 2- 27%

Tatamagouche Mt.

May 2- 17%



Pictou and Antigonish County


New France

April 27- 5%


April 27- 5%

Mt Thom

April 27- 12%


April 27- 15%

Sunny Brae

April 28- 5%

Monilinia Infection Periods

Once your areas and fields are at or above 40% F2, you need to watch the weather forecast for any potential infection periods. Growers should apply products before an infection period for those products to work and to protect blueberry plants from infection.

What is an infection period? The infection period combines wetness duration and temperature. The warmer the temperature and the longer the wetness duration will create a higher chance of infection occurring.

From weather forecasting information (Environment Canada and Weather Network), it looks like we will get some rain from May 4-6 depending on the area and if your fields are at or above 40% F2, you are at risk of Monilinia infection (infection period). I also took data from those stations we installed in wild blueberry fields and show in the next 7 days period, and show what are the potential infection period for fields that reached 40% F2.


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% F2!!!

*Predict period: May 3-9



Glenholme (NSW001)

May 4-6

Murray Siding (NSW002)

May 4-5

Upper Kemptown (NSW022)


Kavanaugh Mills (NSW023)

May 4-5

Debert (NSW036)

May 4-6

Belmont (NSW037)

May 4-6

Staples Brook (NSW038)

May 4-6





Wyvern (NSW003)

May 5

Oxford (NSW005)

May 5

Halfway River (NSW039)

May 4-5





Blue Mountain (NSW017)

May 5

Sunny Brae (NSW018)

May 5

New Gairloch (NSW019)

May 5

Keble (NSW020)

May 4-5

Four Mile Brook (NSW021)

May 5

College Grant (NSW040)

May 5



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