Mummyberry Forecast For Monday May 11 to Tuesday May 12th.

Lincoln and Knox counties
Mummy berry cups were still actively producing spores over the weekend. There were two infection periods, one on Saturday night and one on Sunday night. The cups appear to be drying up today (Monday). The fungus probably is finished producing spores in most of these areas unless you have a particularly cool or wet field.

Waldo, Hancock, Penobscot and Washington counties
Mummy berry cups are still actively producing spores in Waldo, Hancock, Penobscot, and Washington counties. There were infection periods over the weekend in these areas.

Your plants will have been protected over the weekend if you applied fungicide on Friday May 1st or after that. The recommended fungicides will protect plants for approximately 7 to 10 days after application.
If your last application of fungicide was before May 1st, then you have 72 hours from the start of the rain or fog on Saturday evening to apply fungicide and still control the fungus. For example, if it started raining on Saturday May 9th at 7pm in your field you have until Tuesday May 12th at 7pm to apply fungicide to control the disease.

There is currently forecasted a less than 50% chance of rain on Thursday and Thursday night, so there may not be any more infection periods this week due to rain, but fog in localized areas may still be a problem.

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.