Cooperative Extension: Maine Wild Blueberries

4.24.12 Mummy Berry Forecast: Tuesday, April 24

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By Seanna Annis

We have had a long infection period extending in some fields from Friday, April 20 and in others from Saturday, April 21. I have below the locations where we have weather stations and roughly when the infection periods started in those areas.

If you had applied fungicide on or after Monday, April 16, your plants were protected during this last weekend and Monday, and you do not need to apply fungicides at this time.

If your last application of fungicide was before Monday, April 16, you have up to 72 hours to apply fungicide (propiconazole or fenbuconazole) from the beginning of the infection period to kill off the fungus. Considering the long period of infection the fungus had from Friday to Monday in some areas, if your last application of fungicide was before Monday, April 16, an application before the end of Wednesday, April 25 would still kill off some of the fungus that did get in your plants.