Cooperative Extension: Maine Wild Blueberries

Monilinia infection at all weather stations fall April 2021

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There were Monilinia infection conditions detected in fields  where we have a weather station across blueberry growing areas in Midcoast and Downeast.  I suspect there are Monilinia cups in all of these fields,  and the plants are susceptible.

Most infection periods started in the evening of Thursday April 29th and continued through the night and into today, Friday April 30th. There is rain forecast for Monday May 3rd through Tuesday May 4th and will likely cause Monilinia infection in many fields.

If you have applied fungicides after April 19th (10 days) or April 22 (7 days), your plants were probably protected during this infection period.  If your plants were not protected, you have until the evening of May 2nd to apply a fungicide with some kickback to provide some protection against infection.