Mummyberry Forecast For Friday, May 8th through Sunday, May 10th.

Lincoln and Knox counties
Mummy berry cups are likely still actively producing spores particularly in northern portions of these counties and later (cooler or wetter) fields. As long as the fungus is producing spores, there is a risk of mummy berry fungus infection.

Waldo, Hancock, Penobscot and Washington counties
Mummy berry cups are actively producing spores in Waldo, Hancock, Penobscot, and Washington counties.

There have been a series of infection periods over the last 3 days. Your plants will be protected for approximately 7 to 10 days after you apply fungicide. So if you applied fungicide last week (Monday April 27 or after) your plants were probably still protected this past week (Monday May 4th through Friday May 8th).

There is rain forecasted for late Saturday through Sunday in most blueberry growing areas and if the temperature and length of rain forecasted occurs this will be another infection period for the fungus.
Remember you have 72 hours from the START of the rain/fog period to apply fungicide, if necessary, in your field.

Whether there was an infection period depends upon the length of plant wetness caused by continuous rain and fog in your area and the temperature during the plant wetness. Please check the chart in Factsheet #217 at the Wild Blueberry extension site (http://wildblueberries.maine.edu) for more information on the chance of infection depending upon temperature and length of plant wetness.

Please check Factsheet #219 for current mummy berry control recommendations.