Wild Blueberry Blight Line Info - May 10

Tuesday, May 10, 2011

Special Notes:
• Grower co-operators in various areas of the province monitor flower bud development, apothecial cup development, as well as keep track of temperature and flower bud wetness.
• The decision to control Monilinia Blight is dependent on past history of the disease in a particular field.
• Flower buds become susceptible to Monilinia Blight at the F2 stage (bud scales separating).
• Once fields reach 40-50% F2 and beyond, a fungicide is required within 72 hours of the start of an infection period.
• This application will provide 7-10 days protection.
• Refer to Monilinia factsheets for pictures of the F2 stage and temperature and wetness requirements for an infection period.

Location & Bud Stage
Rawdon (Hants County) - 59% F2
Glenmore (Halifax County) - 57% F2
Dean (Musq) - 46% F2
Cooks Brook (Halifax County) - 86% F2
Kemptown (Colchester County) - 18% F2
Earltown (Colchester County) - 59% F2
Swallow Road (Cumberland County) - 88% F2
Tatamagouche Mtn (Colchester County) - 72% F2
Spidell Hill (Colchester County) - 46% F2
Monastery (Antigonish County) - 50% F2
Glencoe (Guysborough County) - 25% F2
Highland Village (Colchester County) - 39% F2
Londonderry (Colchester County) - 39% F2
Farmington – (Cumberland County) – 18% F2
Westchester – (Cumberland County)– 52% F2
Windham Hill – (Cumberland County)– 45% F2
Mapleton – (Cumberland County)– 61% F2
Woods Mt –(Cumberland County)– 45% F2
Diligent River – (Cumberland County)– 44% F2
Parrsboro – (Cumberland County)– 23% F2

There are mature apothecial cups in mainland Nova Scotia. There are many fields in the province that are nearing or are above the critical 40 to 50% F2 stage. Growers should be monitoring their fields for bud development. Since the May 6th report there have been long wet periods for fields at the 40 to 50% F2 threshold. Growers have 72 hours from the start of the infection period to apply a fungicide in fields at the critical stage.

A data logger at Rawdon had the following infection periods:
May 7th-8th 20hrs @ 8.9 degrees Celcius
May 8th-10th 38 hrs @ 6.5 degrees Celcius (continuing).

Field conditions are extremely wet due to the heavy rains that have occured on May 9th and 10th. Environment Canada is predicting periods of rain continuing from Tuesday May 10th to Thursday May 12th, which will worsen already soft field conditions and prevent growers from being able to apply controls.

Take Note:
Next forecast will be on the afternoon of Friday, May the 13th.
Any questions, please contact Rick Delbridge at 902-678-5329.