Blueberry Blog - Cooperative Extension: Maine Wild Blueberries - University of Maine Cooperative Extension

Wild Blueberry Blog

Real-Time Updates on Frost, Disease and Pest Events in Maine!

Events are grouped by year below. Please consider filling out the signs and symptoms survey at the bottom of this page to help track these events and improve real-time updates for growers.

For older posts please visit the Blueberry Blog Archive

Botrytis cover blueberry plant post bloom

2021

Botrytis risk May 20th to 24th and cold temperatures May 24th
Time to look for symptoms of Mummy berry and Botrytis flower blight
Possible Monilinia infection and cold temperatures in some fields May 12 to 14th
Monilinia infection periods of May 10th to May 11th
Monilinia infection periods in all weather station fields May 5 to 6th
Monilinia infection some locations May 4 to 5th
Monilinia infection at all weather stations fall April 2021
Monilinia infection April 27 or 28 in Midcoast and Hancock
Possible Mummy berry infection April 25th to April 26th
Possible Mummy berry infection April 21 to 22nd, 2021
Mummy berry alert for possible infections this week Monday April 19
4.12.21 Mummy berry season is starting for 2021

2020

7.24.20 It is time to begin monitoring for Spotted Wing Drosophila
6.03.20 Possible frost overnight June 1st to June 2nd in many locations
6.01.20 Frost and Botrytis risk from May 23rd to June 1st
5.25.20 Mummy berry season over in most areas for 2020 – symptoms to look for
5.16.20 Cold temperatures May 14th to May 15th and Monilinia infection overnight from May 15th to May 16th
5.14.20 Cold temperatures overnight May 13 to May 14, Probable Monilinia infection on Friday May 15th
5.13.20 Cold temperatures overnight from May 12th to May 13th
5.12.20 Mummy berry infections from May 11th to May 12th
5.11.20 Cold temperatures reported overnight from May 10th to May 11th
5.10.20 Possible mummy berry infection period and cold temperatures May 8 to 10th
5.08.20 Mummy berry infections and frost May 6 to May 8th
5.04.20 Mummy berry infection period in Waldoboro and West Rockport areas May 4th
5.03.20 Mummy berry infection period May 3 to May 4, 2020
5.01.20 Probable Mummy berry infection in most locations, May 1 2020
4.28.20 Mummy berry infections likely later this week, April 28
4.26.20 Mummy berry report April 24
4.19.20 Buds are moving along and first report of Monilinia pinheads
4.15.20 Mummy berry season is getting close April 15, 2020

What Signs and Symptoms have you observed?

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Frost damage on blueberry flowers and buds

Frost kills all flowers on each stem and newly emerging leaves