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Mummy berry infections on Mon. and Tues. May 12 and 13

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Knox, Lincoln, and Waldo counties

I think we are getting close to the end of the infection periods in these areas.  There are a few drying up cups being reported but no new ones coming along.  There were infection periods overnight from Monday May 12th to Tuesday May 13th at our Appleton weather station, staring at 6:20pm on Monday May 12 and in Belfast on Mon. May 12th at 9pm.   There were infection periods reported farther south at our weather stations in West Rockport and Dresden Mills.

In those areas where there was an infection period, if you have applied fungicide on or after Monday, May 5th your plants were protected during the infection period over Monday night.  If you have not applied fungicides, you have until the evening of Thursday May 15th, depending upon the rain in your area,  in most areas to apply fungicides (propiconazole or fenbuconazole) to kill any infection.  If you would be applying a second application of propiconazole, it would be a good idea to switch to a different fungicide with a different mode of action to help prevent resistance to propiconazole developing in your field (Please see the 2014 fungicide chart).   Other fungicides should be applied as protectants and before infection periods occur. 

Hancock and Washington counties

There are still cups producing spores in the barrens.  Three of our weather stations reported borderline infection periods, which means the length of leaf wetness reported at the station was 1/2 hour short of what is required for an infection period. Since the length of rain events vary by location, some areas may have experienced an infection period from Sunday night to Monday.  We did not see any infection periods detected at Sedgewick, North Ellsworth, or Eastbrook/Waltham stations.

Location 2014 Infection period start 
Deblois weather station down
Cherryfield Mon. May 12 1am 
Jonesboro Mon. May 12 1am 
Wesley  Mon. May 12 midnight
East Machias/Whiting None

In those areas where there was an infection period, if you have applied fungicide on or after Sunday, May 4th your plants were protected during the infection period over Monday night.  If you have not applied fungicides, you have until the evening of Wednesday May 14th, depending upon the rain in your area,  in most areas to apply fungicides (propiconazole or fenbuconazole) to kill any infection.  If you would be applying a second application of propiconazole, it would be a good idea to switch to a different fungicide with a different mode of action to help prevent resistance to propiconazole developing in your field (Please see the 2014 fungicide chart).   Other fungicides should be applied as protectants and before infection periods occur.

 I apologize for getting this information out so late. If you have any questions, please contact Seanna Annis at sannis@maine.edu.

 

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