Archive for the ‘Mummyberry’ Category

Mon. May 26 – Mummy berry blight and Botrytis blossom blight

Monday, May 26th, 2014

I think the mummy berry infection season is now over for 2014.  Any remaining cups would have dried up over the last few days, so there won’t be any spores to infect the plants.   I don’t think the wet weather we had this weekend or will have on Tuesday will be causing any infection periods for the mummy berry fungus.

You may be seeing symptoms of Mummy berry disease in your field  now and over the next week.    It is too late to spray fungicide at this time. Any symptoms you find are from infections that occurred at least 9 to 10 days ago.  The spores produced on the dead leaves and flowers will NOT cause new killing infections. These spores will infect healthy flowers and produce mummy berries. The number of mummy berries produced are typically too low to be concerned about trying to control this stage of the disease.

MUMMY BERRY SYMPTOMS

Symptoms of mummy berry disease are shown in the pictures below. This fungus does attack and kill both flowers and leaves.  Flowers are typically killed before they open.  The petiole (base of leaf) of leaves give a characteristic shepherd’s crook shape.  Powdery gray spores can be seen at the base of the leaves or flowers where they attach to the plant. Unless it is a very susceptible clone, you will only see isolated leaves and flowers with the disease.

Picture of mummy berry disease symptoms on leaves and flowers. gray powder is found at the base of dead flowers and leaves

FROST

Frost has been minimal this year but may occur in hollows or some more sensitive clones.  Frost tends to affect most of the flowers on a stem. You may also see just the green growing tip of the leaf dying off. Please see pictures below.

 

Picture of frost damage of blossoms, all flowers on a stem tend to be affected. On leaves, the youngest leaf in the center of the cluster have been killed. 

Botrytis blossom blight

You may see Botrytis blossom blight occurring in your field if you had some bloom last week.  The weather over this weekend only produced conditions for Botrytis infection at our North Ellsworth and East Machias/Whiting weather station locations.  Fields in these area are at risk of Botrytis infection, IF the fungus is in these fields.  You can scout for this disease in early blooming clones or dying tissue on weeds in the field.   The symptoms are dead, open, flowers with black hairs sticking out of them (see picture below). You will probably need a magnifying glass or hand lens to see the hairs.  

ONLY apply fungicides to control Botrytis blight IF 1) you have seen severe infection this year in early clones, this means more than one or two blossoms affected, and 2) you have had a severe problem with Botrytis blossom blight in previous years.

You will want to minimize any exposure of honey bees, bumble bees AND native pollinators to pesticides, including fungicides, during bloom.  Bumble bees and native pollinators will still be working pollinating your fields when poor conditions keep the honey bees in their hives.   The fungicides recommended for control of Botrytis blossom blight are considered non-toxic to honey bees BUT we do NOT know how native pollinators would react to these materials or how there may be subtle effects on honey bees and bumble bees. 

My recommendation is NOT to apply fungicides to control Botrytis blossom blight unless you are SURE you have it in your field.  In my experience  visiting many fields reported to have Botrytis blossom blight is that the dead blossoms have been due to Mummy berry disease in the majority of fields. 

If you do apply fungicides during bloom, apply them at LATE EVENING or at NIGHT to minimize the exposure of pollinators to these compounds.

Picture of Botrytis blossom blight showing black hairs coming off of dead flowers or leaves

 Any questions please call Seanna Annis  1-800-897-0757 (Maine only), or email at sannis@maine.edu

Thursday, May 22 Mummy berry disease and Botrytis blossom blight

Thursday, May 22nd, 2014

Hancock and Washington counties

Mummy Berry Disease

There was another infection period overnight for mummy berry disease at all fields with weather stations in Hancock and Washington counties.  Most cups will be dying off by now, but if you have a later or wetter field there is a chance you may have had infection period overnight.  Fungicide applications should protect your plants for about 7 to 10 days after application.   You have until about 3 days from the start of the latest infection to treat your plants to protect them. 

Botrytis Blossom blight
There were also conditions for a moderate to high risk of Botrytis infection around the weather stations at Sedgewick, North Ellsworth and Eastbrook/Waltham over  Tuesday, May 20th  and Wednesday, May 21st nights.   This does NOT mean these fields will get Botrytis blossom blight.  
 I suggest scouting for Botrytis blossom blight in early blooming clones  and dead weeds in those areas to look for the symptoms of the disease.  IF you find the symptoms, then your field may be at risk for Botrytis infection. 

 

Locations Mummy berry Infection  period starting Wednesday May 22nd 
Sedgewick 9:20am
North Ellsworth 11am
Eastbrook/Waltham 6:40pm
Deblois 9pm
Cherryfield 8:40pm
Jonesboro 8:15pm
Wesley  8:40pm
East Machias/Whiting 8pm

Any questions please call Seanna Annis  1-800-897-0757 (Maine only), or email at sannis@maine.edu

Mummy Berry Infection and Botrytis blossom blight Wed. May 21

Wednesday, May 21st, 2014

Knox, Lincoln and Waldo counties

Botrytis blossom blight

This is the time of year to scout for Botrytis blossom blight on early blooming blueberry clones.  Look at dead open flowers, and any dead or dying tissue (leaves or flowers) you see on weeds near or in your fields.  The symptoms are dead, open, flowers with black hairs sticking out of them. You will probably need a magnifying glass or hand lens to see the hairs. Your flowers may also be killed by mummy berry disease, which will not have the black hairs sticking out of the dead tissue.    If you do have Botrytis in your field and are getting a lot of bloom, this wet weather over the next week may cause infections by this fungus.  It is only worthwhile to apply fungicides for Botrytis blossom blight if you are sure you have this disease in your field.  If you do not have this fungus in your field, no matter how much wet weather you get during bloom you will not get Botrytis disease.  Be careful to protect pollinators if you do have to spray for this disease, spray when pollinators are not in the field.

Mummy Berry Disease

Hancock and Washington counties

There were mature spore producing cups found in a few plots around the barrens on Tuesday.  Most locations the cups were drying up. I expect there are still a few cups around in the barrens and they will be finishing up this week.  If you have a later or wetter field there is a chance you may have had infection periods in the past few days. Infection periods occurred overnight on Mon. May 19th  and Tues. May 20th (please see chart below). Wet weather is expected to continue the end of this week.

Infection periods and fungicide applications

Your fungicide application should protect your plants for about 7 to 10 days.  With heavy rainfall, there may be a bit shorter protection than 10 days.   With the infection periods in the last 2 days, you have until about 3 days from the start of the infection to treat your plants to protect them.

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.

 

Locations Infection  period starting Monday May 19th  Infection period starting Tuesday, May 20th
Dresden Mills likely none likely none
West Rockport likely none likely none
Appleton likely none likely none
Belfast  likely none likely none
Sedgewick 10am 3:40pm
North Ellsworth continued from Sun. May 18th 1:40pm
Eastbrook/Waltham 5:40pm 6:20pm
Deblois station down station down
Cherryfield 4:40pm 4pm
Jonesboro 3:45pm 7:45pm
Wesley  2:40pm 6:40pm
East Machias/Whiting 4pm 6pm

Mummy berry infection periods Sat May 10th

Saturday, May 10th, 2014

At all of the weather station conditions for a mummy berry fungus infection period occurred from Friday May 9th or Saturday May 10.  Please see the table below to see the approximate time when the  infection period started in your area.  Most growers in Knox, Lincoln and Waldo counties have plants that are susceptible and there are mummy berry cups producing spores in these areas.   In Hancock and Washington counties, there are mummy berry cups in the fields producing spores but  how far along the blueberry plants have opened vary by field. Growers will need to check their own fields to determine if greater than 40% of flower buds are at F2 and whether they need to spray.

In those areas where there was an infection period, if you have applied fungicide on or after Saturday, May 3rd your plants were protected during the infection period this weekend.  If you have not applied fungicides, you have until the evening of Tuesday May 13th, depending upon the rain in your area,  in most areas to apply fungicides (propiconazole or fenbuconazole) to kill any infection.  Other fungicides should be applied as protectants and before infection periods occur.

Location 2014 Infection period start 
Dresden Mills Sat. May 10 12:40am
West Rockport Sat. May 10 12:40am
Appleton Sat. May 10 1:20am
Belfast  Fri. May 9 6:20pm
Sedgewick Sat. May 10 7am
North Ellsworth Sat. May 10 1:40am
Eastbrook/Waltham Sat. May 10 7am borderline
Deblois weather station down
Cherryfield Sat. May 10 8:20am
Jonesboro Sat. May 10 8:15am 
East Machias/Whiting Fri. May 9 7:40pm and Sat. May 10 8:40am
Wesley  Sat. May 10 8am

Mummy Berry Season is getting close

Sunday, April 20th, 2014

With the warmer weather, flower buds are just starting to open up in the south and the mummy berry season is approaching.  If you have a mummy berry patch in Knox, Lincoln or Waldo counties, now is the time to start monitoring it.

Monitor your plants by checking the flower buds.  Once you have 40% or over of your flower buds at the F2 stage (crown stage) then you have enough plant tissue that an infection of the mummy berry fungus could be harmful.

I am looking for helpful growers to tell me how their plants are progressing and if they have a mummy berry patch, how that is doing as well.   If you do check your plants or mummy berry patch, please give me a call  or send me an email on how they are progressing. 

We have weather stations up in Dresden Mills, West Rockport, Appleton, and Belfast so far.  We hope to have the rest in place in the next two weeks.

If you wish to be receive these posts via email and are not currently doing so, please send your address to me at sannis@maine.edu.

Seanna Annis, 1- 800-897-0757 (Maine only) or  207-581-2621. 

Symptoms of Mummy berry disease and others

Monday, May 20th, 2013

I think the mummy berry infection season is over for this year.  Cups in most areas would have dried up over the last few days, so there won’t be any spores to infect the plants.   I don’t think this current wet weather will be causing any infection periods for the mummy berry fungus.

You may start seeing symptoms of Mummy berry disease in your field  now and over the next week.    It is too late to spray fungicide at this time. Any symptoms you find are from infections that occurred at least 9 to 10 days ago.  The spores produced on the dead leaves and flowers will NOT cause new killing infections. These spores will infect healthy flowers and produce mummy berries. The number of mummy berries produced are typically too low to be concerned about trying to control this stage of the disease.

MUMMY BERRY SYMPTOMS

Symptoms of mummy berry disease are shown in the pictures below. This fungus does attack and kill both flowers and leaves.  Flowers are typically killed before they open.  The petiole (base of leaf) of leaves give a characteristic shepherd’s crook shape.  Powdery gray spores can be seen at the base of the leaves or flowers where they attach to the plant. Unless it is a very susceptible clone, you will only see isolated leaves and flowers with the disease.

Picture of mummy berry disease symptoms on leaves and flowers. gray powder is found at the base of dead flowers and leaves

FROST

You may also see frost damage in some clones. Frost tends to affect most of the flowers on a stem. You may also see just the green growing tip of the leaf dying off. Please see pictures below.

 

Picture of frost damage of blossoms, all flowers on a stem tend to be affected. On leaves, the youngest leaf in the center of the cluster have been killed. 

Botrytis blossom blight

If you have had Botrytis blossom blight in your field previously, this is the time of year to scout for it in early blooming clones.  The symptoms are dead, open, flowers with black hairs sticking out of them (see picture below). You will probably need a magnifying glass or hand lens to see the hairs.   If you do have it in your field, this wet weather over this week may cause infection by this fungus.  It is only worthwhile to apply fungicides for Botrytis blossom blight if you are sure you have had this disease in the past and it has affected your yield.

Picture of Botrytis blossom blight showing black hairs coming off of dead flowers or leaves

 

If you have any questions, please email Seanna Annis at sannis@maine.edu or call 207-581-2621.

Mummy Berry Forecast for Thursday May 16th

Thursday, May 16th, 2013

Knox, Lincoln, Waldo and Southern Hancock counties

Mummy berry cups dried up early this week so it is unlikely there were any infections in your area in this last rain.

Northern Hancock and Washington counties

Most cups are finished from our monitored field sites.  Only one mature cup was still reported at Long Pond area near Deblois  today.  All the rest of the monitored sites, around Deblois, Wesley, Cherryfield and along the coast to East Machias do not have any remaining cups.  I expect the cups to be finished completely within a couple of days.

If you have a late field, there is a chance you may still have cups in your field and may have had an infection period last night.

For those of you who might have had an infection period last night, if you have applied fungicide on or after Monday May 6th, your plants were protected during this last infection period last night.  I would only recommend fungicides if you have a late field that is not yet elongating flower buds and has a history of severe mummy berry disease.  If you have not applied fungicides, you have until Sunday  May 19th  in the evening  to apply fungicides to kill any infection.    You will want to consider if you have bees in your field in your decision to apply fungicides.

If you have any questions please contact Seanna Annis via email sannis@maine.edu or by phone 207-581-2621.

Weather station location Start of infection period on Wednesday May 15th
West Rockport Cups done
Appleton Cups done
Sedgewick Cups done
Ellsworth Cups done
Silsby Plains 8:40pm
Deblois 9:20pm
Montegail  9pm
Rocky Pond 9:20pm
Jonesboro No cups Monday
East Machias No cups Monday
Meddybemps 10:20pm

Mummy berry forecast and Frost – Tuesday May 14th

Tuesday, May 14th, 2013

Meddybemps area only

Our Meddybemps weather station  indicated there was an infection period in that field last night starting at 7:20pm and continuing to  8:40am.    For this infection period in the Meddybemps area if you have applied fungicide on or after Sunday May 4th, your plants were protected during the infection period overnight.  If you have not applied fungicides, you have until Thursday May 16th  in the evening  to apply fungicides to kill any infection.    You will want to consider if you have bees in your field in your decision to apply fungicides.

Other areas

No infection periods were indicated in our other monitored fields.

The temperature dipped below 30F at our Silsby Plain field, but no where else.  In Silsby Plain, it was below 30F from midnight to 1:20pm. This may cause frost damage to fully open flowers.

Any questions, please contact Seanna Annis at 581-2621 or send me an email sannis@maine.edu.

Mummy Berry Forecast for Monday May 13th

Monday, May 13th, 2013

Knox and Lincoln Counties

The mummy berry cups were finishing up last week and unless you had a very late field, you probably did not have any infection over this past weekend.

Waldo and Southern Hancock counties

The mummy berry cups were finishing up a the end of last week, but there may have been infection periods over this weekend in your areas.  If you have a mummy berry plot, I would like to know if it is finished or not. 

Northern Hancock and Washington counties

There were infection periods in fields in these areas over the weekend.

Mature mummy berry cups were reported across this area on Friday, but no new cups or pinheads were observed.   I expect these cups will be finished by early this week. 
If you have a mummy berry plot, I would like to know whether the cups are finished.  

 

Frost warning

Temperatures dipped drastically on Sunday night and are expected to be in the 30sF for the next two nights. From Lee Beers graduate work, fully open flowers can be damaged at temperatures below 30F.

For these last infection periods starting on Saturday, if you have applied fungicide on or after Thursday May 2nd, your plants were protected during the infection period this past weekend.  If you have not applied fungicides, you have until Wednesday May 15th  in the evening (depending upon the field) to apply fungicides to kill any infection.    You will want to consider if you have bees in your field in your decision to apply fungicides.

Any questions, please contact Seanna Annis at 581-2621 or send me an email sannis@maine.edu.

Weather station location Start of infection period on Saturday May 11th Start of infection period on Sunday May 12th
West Rockport cups probably have gone by
Appleton cups probably have gone by
Sedgewick 4:20pm 7:40pm
Ellsworth 4:40pm continued to Monday
Silsby Plains 3:40pm continued through Monday
Deblois 5pm 8:40pm
Montegail  5:20pm 5pm
Rocky Pond 6:20pm 8:40pm
Jonesboro 4:15pm and probably continued through Monday
East Machias wetness continuous from Friday night
Meddybemps 5:20pm 12:40pm

Mummy Berry Forecast for Saturday May 11th – another infection period

Saturday, May 11th, 2013

 As you may have guessed, there was another infection period in all of our monitored sites overnight (from Friday May 10th) and there will be another one today and into tomorrow (Sunday May 12th) morning.  

The good news for more southern fields in Knox and Lincoln counties is that  I suspect the mummy berry cups are finished or just about.  Unfortunately, I do not have a grower monitoring a mummy berry plot that far south so this is my best estimate  considering the reports from other areas.  If you have a late field around West Rockport area you may have experienced an infection period.

The rest of the monitored fields still have reports of mature cups so they do have the fungus around and are likely to have had another infection period overnight.   I expect we are near the end of the season and the warm dry weather next week will finish off the cups.

Remember your plants are susceptible even if the leaves are unfurled and flowers are starting to appear.    

For this last infection period, if you have applied fungicide on or after Wednesday May 1st, your plants were protected during the infection period last night.  If you have not applied fungicides, you have until Monday May 13th  in the evening (depending upon the field) to apply fungicides to kill any infection.

I would like to hear from anyone with a mummy berry plot, to know if their mummies are still producing cups or finished. Please call 207-581-2621 or send me an email at sannis@maine.edu.

If you have any questions, please contact Seanna Annis at sannis@maine.edu, or 581-2621.

Weather station location Start of infection period on Friday May 10th
West Rockport 7:40pm only in late fields
Appleton 11pm
Sedgewick 8:40pm
Ellsworth 7pm
Silsby Plains 6:20pm
Deblois 10pm
Montegail  11:40pm
Rocky Pond midnight
Jonesboro 8:15pm
East Machias 8:40pm
Meddybemps 7pm