Cooperative Extension: Maine Wild Blueberries

5.06.18 Mummy Berry Infection period, May 6 to May 7

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Midcoast Region

There was a Monilinia infection period in most areas, but not all, from the evening of May 6 through to May 7, 2018.  Please see the table below.

Downeast

There were conditions for a Monilinia infection period last night Downeast.  Plants were not ready in many areas on Friday.  With the warm weather, the plants have progressed. Blueberry Hill Farm in Jonesboro has 78% F2 and F3 this morning (Monday) and was at 22% F2  on Wednesday of last week. The cups also will have progressed with the rain and warm weather.  Please check your plants to see if they are at greater than 40% F2 (crown stage).  If they are well past that stage, your field may have had an infection period.   Please let me know if you have cups or what stage your plants are.  You can email me, Seanna Annis, at sannis@maine.edu or call me at the blueberry hotline 1.800.897.0757.

If you applied fungicide after Sunday, April 29 (seven days), your plants were protected during this infection period.

If you have not applied a fungicide and want to apply a fungicide with some kickback activity, Propimax, Bumper, Orbit, Tilt for example (containing propiconazole) or Indar (containing fenbuconazole), you can apply your fungicide in approximately 72 hours of the start of the infection period.  With this warm weather, you may want to do this as soon as you can since the fungus is also going to grow faster in the warm weather.  For this potential infection period on Sunday night, you would have until approximately  Wednesday evening, May 9.

Please see the 2018 fungicide recommendations on the Fact Sheet 219 – Disease Control Guide for Wild Blueberries and check with your buyer before applying any fungicides to your crop.