Mummy berry forecast for Thursday May 14 to Friday May 15th

Regions near Belfast, in Waldo county, Hancock and Washington counties

Mummy berry cups are still producing spores in these areas. Unfurled leaf buds and flowers are still susceptible. All leaf and flower buds are still susceptible as long as the fungal spores are present.

There has not been an infection period in any of these areas since Sunday night.

However, there is likely to be an infection period on Thursday through Friday in most areas. With the warmer temperatures, the fungus needs less length of time with plant wetness to penetrate into the plants. The temperatures are predicted to be in the low 50s to the 40s overnight on Thursday. At 43 F the fungus needs at least 10 hours of plant wetness to get into the plant, and at 50 F, at least 8 hours of plant wetness.

If you have applied fungicide within the last 7 to 10 days (Tuesday May 5 through to Thursday May 14th), your plants will still be protected during the infection period Thursday night, so you do not need to apply fungicides.
If you applied fungicides before Tuesday May 5th your plants may get infected by the mummy berry fungus during Thursday night. You have 72 hours to apply fungicide after the beginning of the infection period (rain or fog) in your field to kill off any fungus that has penetrated your plants.

Factsheet #217 has more information about the mummy berry forecasting method and lengths of time of rain or fog and temperature to have infection periods.

Factsheet #219 contains this year's recommendations for using fungicides to control mummy berry disease.