UPDATED FORECAST FOR DOWNEAST Wednesday April 29, 2009
UPDATE:
There was a infection period due to heavy fog in the Downeast area, (Deblois, Cherryfield, Jonesboro, Jonesport) on Monday night. The fog started in most areas around 9pm and lasted to around 7am on Tuesday morning.
Mummy berry cups are present and producing spores in this area.
Please check your field to see if you have enough susceptible plants (more than 40% of random stems with flower buds are in the flower bud crown stage) to make an application of fungicide cost effective.
To control this disease you should apply fungicide within 72 hours of the START of the rain/fog period in your field. For example if you choose to apply fungicide, you have until 9pm on Thursday April 30 to control any fungus that got into the plant on Monday night. If you apply fungicide on Thursday, the fungicide will also provide protection through the predicted storm this weekend.
Remember whether infection did occur in your field will depend upon 1) how far along the plants are in your field, 2) the actual temperature during, and length of time of rain or rain and fog in your field, and 3) of course, have you had mummy berry disease in your field in previous years .
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
Wednesday, April 29, 2009
Tuesday, April 28, 2009
UPDATED FORECAST FOR MUMMY BERRY FOR ALL REGIONS Tuesday April 28, 2009
UPDATE: Union, Rockport, Camden area.
There has been an infection period in the Union area. There was long enough rain (more than 8 hours at 48 F) over Monday night and morning for an infection period to have occurred. There are still active mummy berry cups in fields in these areas. Most plants are likely susceptible to the fungus now. To control this disease you can apply fungicide within 72 hours of the START of the rain/fog period in your field. For example if the rain started in your area at 9 pm on Monday you have until 9pm on Thursday of this week to apply fungicide to control the infection.
Belfast, Orland areas
Mummy berry cups are now active in your area. Most plants are close to or are susceptible by now.
NEW: Downeast area, (Deblois, Cherryfield, Jonesboro, Jonesport)
Mummy berry cups are just getting started in this area, but some cups are large enough to be spreading spores. Please check your field to see if you have enough susceptible plants (more than 40% of random stems with flower buds are in the flower bud crown stage) to make an application of fungicide cost effective IF an infection period occurs.
IF your plants are at the susceptible stage AND your field gets FOG you may get an infection period. Please look at the chart in Factsheet #217 to check the length of time for plant wetness and temperature during that period.
ALL AREAS
There is a chance of new infection periods sometime from Tuesday through Wednesday morning with the storm coming through. This will depend on the length of time you have rain and fog in your field and the temperature during this time. At 65 F you need 8 hours of rain and fog, but at 72 to 80 F, which is forecasted for some areas Tuesday, the fungus only needs 3.5 hours of plant wetness to get infect the plants.
You will need to keep track of the approximate length of time of continuous rain and fog in your area and the temperature during the rain and fog to tell whether your field has had an infection period.
To control this disease you should apply fungicide within 72 hours of the START of the rain/fog period in your field. For example if the rain started in your area at 5 am on Tuesday you have until 5 am on Friday of this week to apply fungicide to kill off the infection and protect your plants.
Remember whether infection did occur in your field will depend upon 1) how far along the plants are in your field, 2) the actual temperature during, and length of time of rain or rain and fog in your field, and 3) of course, have you had mummy berry disease in your field in previous years .
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
UPDATE: Union, Rockport, Camden area.
There has been an infection period in the Union area. There was long enough rain (more than 8 hours at 48 F) over Monday night and morning for an infection period to have occurred. There are still active mummy berry cups in fields in these areas. Most plants are likely susceptible to the fungus now. To control this disease you can apply fungicide within 72 hours of the START of the rain/fog period in your field. For example if the rain started in your area at 9 pm on Monday you have until 9pm on Thursday of this week to apply fungicide to control the infection.
Belfast, Orland areas
Mummy berry cups are now active in your area. Most plants are close to or are susceptible by now.
NEW: Downeast area, (Deblois, Cherryfield, Jonesboro, Jonesport)
Mummy berry cups are just getting started in this area, but some cups are large enough to be spreading spores. Please check your field to see if you have enough susceptible plants (more than 40% of random stems with flower buds are in the flower bud crown stage) to make an application of fungicide cost effective IF an infection period occurs.
IF your plants are at the susceptible stage AND your field gets FOG you may get an infection period. Please look at the chart in Factsheet #217 to check the length of time for plant wetness and temperature during that period.
ALL AREAS
There is a chance of new infection periods sometime from Tuesday through Wednesday morning with the storm coming through. This will depend on the length of time you have rain and fog in your field and the temperature during this time. At 65 F you need 8 hours of rain and fog, but at 72 to 80 F, which is forecasted for some areas Tuesday, the fungus only needs 3.5 hours of plant wetness to get infect the plants.
You will need to keep track of the approximate length of time of continuous rain and fog in your area and the temperature during the rain and fog to tell whether your field has had an infection period.
To control this disease you should apply fungicide within 72 hours of the START of the rain/fog period in your field. For example if the rain started in your area at 5 am on Tuesday you have until 5 am on Friday of this week to apply fungicide to kill off the infection and protect your plants.
Remember whether infection did occur in your field will depend upon 1) how far along the plants are in your field, 2) the actual temperature during, and length of time of rain or rain and fog in your field, and 3) of course, have you had mummy berry disease in your field in previous years .
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
Monday, April 27, 2009
Mummy Berry Forecast for Monday April 27 to Wednesday April 29th
For Knox, Lincoln, Waldo and southwestern Hancock.
Union, Rockport, Camden area.
There are still active mummy berry cups in fields in these areas. Most plants are likely susceptible to the fungus now.
Belfast, Orland areas
Mummy berry cups are now active in your area. And if you have an early or particularly wet field, they may have been active by yesterday (Sunday April 26th). Most plants are close to or are susceptible by now. IF your plants are susceptible, more than 40% of stems had flower buds at the crown stage (please see post on Monday April 20th on how to evaluate this).
Overall forecast for Knox, Lincoln, Waldo, southwestern Hancock
There was little chance of an infection period within the last 3 days, since few fields were likely to have rain longer than 6 hours (the minimal length of plant wetness required to get infection at 65 F). IF your field had FOG you might have had an infection period. Please look at the chart in Factsheet #217 to check the length of time for plant wetness and temperature during that period.
There is a chance of infection periods sometime within Monday night through to Wednesday morning, depending upon whether you have fog or rain in your field and the temperature. The chart below show the plant wetness up to 65 F. At 72 to 80 F, which is forecasted for some areas Tuesday, the fungus only needs 3.5 hours of plant wetness to get infect the plants.
You will need to keep track of the approximate length of time of continuous rain and fog in your area and the temperature during the rain and fog to tell whether your field has had an infection period.
IF your plants are susceptible, more than 40% of stems had flower buds at the crown stage (please see previous post on how to evaluate this), AND you have had mummy berry disease in that field before, then the fungus could have infected your plants.
To control this disease you should apply fungicide within 72 hours of the START of the rain/fog period in your field. For example if the rain started in your area at 5 am on Tuesday you have until 5 am on Friday of this week to apply fungicide to kill off the infection and protect your plants.
Remember whether infection did occur in your field will depend upon 1) how far along the plants are in your field, 2) the actual temperature during, and length of time of rain or rain and fog in your field, and 3) of course, have you had mummy berry disease in your field in previous years .
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
For Knox, Lincoln, Waldo and southwestern Hancock.
Union, Rockport, Camden area.
There are still active mummy berry cups in fields in these areas. Most plants are likely susceptible to the fungus now.
Belfast, Orland areas
Mummy berry cups are now active in your area. And if you have an early or particularly wet field, they may have been active by yesterday (Sunday April 26th). Most plants are close to or are susceptible by now. IF your plants are susceptible, more than 40% of stems had flower buds at the crown stage (please see post on Monday April 20th on how to evaluate this).
Overall forecast for Knox, Lincoln, Waldo, southwestern Hancock
There was little chance of an infection period within the last 3 days, since few fields were likely to have rain longer than 6 hours (the minimal length of plant wetness required to get infection at 65 F). IF your field had FOG you might have had an infection period. Please look at the chart in Factsheet #217 to check the length of time for plant wetness and temperature during that period.
There is a chance of infection periods sometime within Monday night through to Wednesday morning, depending upon whether you have fog or rain in your field and the temperature. The chart below show the plant wetness up to 65 F. At 72 to 80 F, which is forecasted for some areas Tuesday, the fungus only needs 3.5 hours of plant wetness to get infect the plants.
You will need to keep track of the approximate length of time of continuous rain and fog in your area and the temperature during the rain and fog to tell whether your field has had an infection period.
IF your plants are susceptible, more than 40% of stems had flower buds at the crown stage (please see previous post on how to evaluate this), AND you have had mummy berry disease in that field before, then the fungus could have infected your plants.
To control this disease you should apply fungicide within 72 hours of the START of the rain/fog period in your field. For example if the rain started in your area at 5 am on Tuesday you have until 5 am on Friday of this week to apply fungicide to kill off the infection and protect your plants.
Remember whether infection did occur in your field will depend upon 1) how far along the plants are in your field, 2) the actual temperature during, and length of time of rain or rain and fog in your field, and 3) of course, have you had mummy berry disease in your field in previous years .
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
Wednesday, April 22, 2009
Mummy Berry Forecast for Wednesday April 22nd
For Knox, Lincoln and lower Waldo county.
There has been an infection period for the mummy berry fungus in most of the region around Union, Rockport area.
IF your plants are susceptible, more than 40% of stems had flower buds at the crown stage (please see previous post on how to evaluate this), AND you have had mummy berry disease in that field before, then the fungus could have infected your plants.
With the rain and heavy fog in this area there will have been long enough period of leaf wetness for the fungus to have infected the leaf and flower buds. To control this disease you should apply fungicide within 72 hours of the start of the rain/fog period in your field on Tuesday. For example if the rain started in your area at 5 am on Tuesday you have until 5 am on Friday of this week to apply fungicide to kill off the infection and protect your plants.
Remember whether infection did occur in your field will depend upon 1) how far along the plants are in your field, 2) the actual temperature during, and length of time of rain or rain and fog in your field, and 3) of course, have you had mummy berry disease in your field in previous years .
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
For Knox, Lincoln and lower Waldo county.
There has been an infection period for the mummy berry fungus in most of the region around Union, Rockport area.
IF your plants are susceptible, more than 40% of stems had flower buds at the crown stage (please see previous post on how to evaluate this), AND you have had mummy berry disease in that field before, then the fungus could have infected your plants.
With the rain and heavy fog in this area there will have been long enough period of leaf wetness for the fungus to have infected the leaf and flower buds. To control this disease you should apply fungicide within 72 hours of the start of the rain/fog period in your field on Tuesday. For example if the rain started in your area at 5 am on Tuesday you have until 5 am on Friday of this week to apply fungicide to kill off the infection and protect your plants.
Remember whether infection did occur in your field will depend upon 1) how far along the plants are in your field, 2) the actual temperature during, and length of time of rain or rain and fog in your field, and 3) of course, have you had mummy berry disease in your field in previous years .
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
Sunday, April 19, 2009
Mummy Berry Forecast for Monday April 20th to Tuesday April 21st
For Knox, Lincoln and lower Waldo county.
Mummy berry cups producing spores were found in South Hope on Wednesday April 15th. The blueberry plants were not susceptible at that time since less than 40% of stems had flower buds at the crown stage.
There is a chance of an infection period occurring around the Union area with the rain forecasted to start Tuesday night. Whether infection does occur will depend upon the actual temperature during and length of time of rain or rain and fog in your field.
Whether you need to spray fungicides for mummy berry control will also depend upon how far along your plants are. IF more than 40% of random stems (4 out of 10) in your field have buds at the crown stage (see photo) your plants are now susceptible to the fungus.
If the weather forecast suggests rain or rain and fog for longer than 10 hours you should check the forecast for the temperature during that period. AT about 36 F, 24 hours of leaf wetness is required for infection. At 43 F, only 10 hours of leaf wetness is required to cause infection.
Please check 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 leaf wetness. Please see Factsheet #219 for recommended disease control methods.
Thursday, April 16, 2009
Welcome to the new Maine Wild Blueberries blog
We will be posting mummy berry blight alerts, irrigation calculated ET values, and more throughout the growing season. Check back regularly, follow us with Google Friend Connect, or subscribe to our RSS.
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