Wild Blueberry Blight Line Info - May 17

Tuesday, May 17, 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) - 81% F2
Glenmore (Halifax County) - 88% F2
Dean (Musq) - +40-50% F2
Cooks Brook (Halifax County) - 98% F2
Kemptown (Colchester County) - 65% F2
Earltown (Colchester County) - 82% F2
Swallow Road (Cumberland County) - 96% F2
Tatamagouche Mtn (Colchester County) - 82% F2
Spidell Hill (Colchester County) - 58% F2
Highland Village (Colchester County) - +40-50% F2
Londonderry (Colchester County) - +40-50% F2
Farmington (Cumberland County) – 20% F2
Westchester (Cumberland County)– +40-50% F2
Windham Hill (Cumberland County)– +40-50% F2
Mapleton (Cumberland County)– +40-50% F2
Woods Mt (Cumberland County)– +40-50% F2
Diligent River (Cumberland County)– +40-50% F2
Parrsboro (Cumberland County)– 46% F2
Keppoch (Cape Breton) - 8% F2
Foote Cape (Cape Breton) - 43% F2
Mira (Cape Breton) - 8% F2

There are mature apothecial cups in mainland Nova Scotia. Most fields in Mainland Nova Scotia are at or above the critical 40 to 50% F2 stage. Due to the cool, wet weather flower buds have not advanced very much since Friday's report. Since the last update on Friday, May the 13th, it has been almost continuously wet throughout the province making for very long infection periods. Fields are very soft making spraying very difficult. Fields that were sprayed 7 or more days ago will require a second fungicide application. Funginex moves into the plant very quickly - within 1 hour. Topas and Mission seem to have similar activity. Environment Canada's 5 day forecast is not particularly good, with cloud, showers and periods of rain in the forecast.

Take Note:
Next forecast will be on the afternoon of Friday, May the 20th.
Any questions, please contact Rick Delbridge at 902-678-5329.