Re: [apple-crop-2] What to do when fireblight hits tall spindle

[Doug Nelson]

 cuts.  I don’t recommend it because the bacteria can move 3 feet beyond the
>> site of visible infection, so disinfesting is a moot point.  Here is my
>> latest article (June 26, 2018) in Penn State Fruit Times about what to do
>> about fire blight now (it’s just below the info about apple scab):
>>
>>
>>
>> https://extension.psu.edu/mid-season-tree-fruit-disease-update
>>
>>
>>
>> And a note: do not spray any streptomycin.  Streptomycin is for bloom
>> time only, and after a trauma event, such as hail. Do not spray it beyond
>> these times.  If you are concerned about new shoot growth (if this is a new
>> orchard pushing right now), I would recommend Cueva to limit spread of
>> shoot blight.
>>
>>
>>
>> Kari Peter, Ph.D.
>> Assistant Research Professor - Tree Fruit Pathology
>> Department of Plant Pathology and Environmental Microbiology
>> Penn State Fruit Research and Extension Center
>> 290 University Dr., P.O. Box 330
>> Biglerville, PA 17307-0330
>>
>> Office: 717-677-6116 Ext. 223
>> Fax: 717-677-4112
>> E-mail: ka...@psu.edu
>> <https://webmail.psu.edu/webmail/shell.cgi?timestamp=1362517824>
>>
>> Twitter: https://twitter.com/drtreefruit
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *From:* apple-crop-boun...@virtualorchard.com [mailto:
>> apple-crop-boun...@virtualorchard.com] *On Behalf Of *Hugh Thomas
>> *Sent:* Thursday, July 19, 2018 1:14 AM
>> *To:* Apple-crop discussion list
>> *Subject:* Re: [apple-crop-2] What to do when fireblight hits tall
>> spindle
>>
>>
>>
>> Doug, it's sort of complicated. First, you probably know the bacteria
>> travels from the tip downwards. The idea is to cut well below where the
>> infection has traveled. You can cut away some bark and see where the brown
>> area meets green cambium. I cut pass this point - well past it. I'm
>> guessing I would cut about three times the length of the affected area. For
>> example, if the tip has died back 6 inches, I would remove 18 inches of
>> that limb. This is my gut but but this has worked for me in the past. I
>> don't know the extent of your knowledge, but you need to be careful not to
>> spread the bacteria with your tools and hands. Some people dip their tools
>> in alcohol or Clorox between cuts. I use Clorox wipes on my shears, making
>> sure I use a fresh wipe almost every cut, as the wipe ought to be very wet.
>> On small limbs, say a quarter of an inch or less, I rip the limb off. The
>> big thing is, take action now!!  With warm weather you can get a lot of
>> damage. If you burn the limbs, don't let the smoke drift into your orchard
>> - something a guy told me
>>
>> Sent from my iPhone
>>
>>
>> On Jul 18, 2018, at 10:24 PM, "wincowg...@centurylink.net" <
>> wincowg...@centurylink.net> wrote:
>>
>> Doug- where are you located?
>>
>> What rootstock(s)?
>>
>> What cultivars?
>>
>> How old are the trees in your tall spindle?
>>
>> What was your fireblight control program at bloom?
>>
>> any post bloom program(s)
>>
>>
>>
>> Win
>>
>>
>>
>> On Jul 18, 2018, at 9:26 PM, Doug Nelson <
>> doug.nel...@nelsonmultimedia.com> wrote:
>>
>>
>>
>> I appear to have fireblight popping up in my orchard. The ipm group tells
>> me to prune all limbs back to central leader and not to do any spraying.
>>
>>
>>
>> What do you do?
>>
>> ___
>> apple-crop mailing list
>> apple-crop@virtualorchard.com
>> http://virtualorchard.net/mailman/listinfo/apple-crop
>>
>>
>>
>> Win Cowgill
>>
>> Apple-Crop Co-Founder
>>
>> Professor Emeritus, Rutgers, the State University
>>
>> Visiting Scholar, UMASS-Amherst
>>
>> CEO- Win Enterprises International, LLC
>>
>> Editor Horticultural News
>>
>> PO Box 143
>>
>> Baptistown, NJ 08803
>>
>> Office 908-489-1476
>>
>> Fax- 908-996-6404
>>
>> Email: wincowg...@mac.com
>>
>> www.wincowgill.com
>>
>> www.virtualorchard.net/
>>
>> http://giselacherry.com/
>>
>> http://virtualorchard.net/njfruitfocus/index.html
>>
>> http://www.appletesters.net
>>
>> http://nc140.org
>>
>> Twitter  @mrsuncrisp <https://twitter.com/mrsuncrisp>
>>
>>
>>
>> ___
>> apple-crop mailing list
>> apple-crop@virtualorchard.com
>> http://virtualorchard.net/mailman/listinfo/apple-crop
>>
>> ___
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>> apple-crop@virtualorchard.com
>> http://virtualorchard.net/mailman/listinfo/apple-crop
>>
>
>
> --
> Doug Nelson
> President
> Nelson Multimedia Inc.
>
>
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Re: [apple-crop-2] What to do when fireblight hits tall spindle

[br...@beechcreekorchards.com]

t; Kari Peter, Ph.D.
>>> Assistant Research Professor - Tree Fruit Pathology
>>> Department of Plant Pathology and Environmental Microbiology
>>> Penn State Fruit Research and Extension Center
>>> 290 University Dr., P.O. Box 330
>>> Biglerville, PA 17307-0330
>>> 
>>> 
>>> Office: 717-677-6116 Ext. 223
>>> Fax: 717-677-4112
>>> E-mail: ka...@psu.edu
>>> 
>>> Twitter: https://twitter.com/drtreefruit
>>> 
>>>  
>>> 
>>>  
>>> 
>>>  
>>> 
>>>  
>>> 
>>> From: apple-crop-boun...@virtualorchard.com 
>>> [mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of Hugh Thomas
>>> Sent: Thursday, July 19, 2018 1:14 AM
>>> To: Apple-crop discussion list
>>> Subject: Re: [apple-crop-2] What to do when fireblight hits tall spindle
>>> 
>>>  
>>> 
>>> Doug, it's sort of complicated.   First, you probably know 
>>> the bacteria travels from the tip downwards. The idea is to cut well below 
>>> where the infection has traveled. You can cut away some bark and see where 
>>> the brown area meets green cambium. I cut pass this point - well past it. 
>>> I'm guessing I would cut about three times the length of the affected area. 
>>> For example, if the tip has died back 6 inches, I would remove 18 inches of 
>>> that limb. This is my gut but but this has worked for me in the past. I 
>>> don't know the extent of your knowledge, but you need to be careful not to 
>>> spread the bacteria with your tools and hands. Some people dip their tools 
>>> in alcohol or Clorox between cuts. I use Clorox wipes on my shears, making 
>>> sure I use a fresh wipe almost every cut, as the wipe ought to be very wet. 
>>> On small limbs, say a quarter of an inch or less, I rip the limb off. The 
>>> big thing is, take action now!!  With warm weather you can get a lot of 
>>> damage. If you burn the limbs, don't let the smoke drift into your orchard 
>>> - something a guy told me
>>> 
>>> Sent from my iPhone
>>> 
>>> 
>>> On Jul 18, 2018, at 10:24 PM, "wincowg...@centurylink.net" 
>>>  wrote:
>>> 
>>> Doug- where are you located?
>>> 
>>> What rootstock(s)?
>>> 
>>> What cultivars?
>>> 
>>> How old are the trees in your tall spindle?
>>> 
>>> What was your fireblight control program at bloom? 
>>> 
>>> any post bloom program(s)
>>> 
>>>  
>>> 
>>> Win
>>> 
>>>  
>>> 
>>> On Jul 18, 2018, at 9:26 PM, Doug Nelson  
>>> wrote:
>>> 
>>>  
>>> 
>>> I appear to have fireblight popping up in my orchard. The ipm group tells 
>>> me to prune all limbs back to central leader and not to do any spraying. 
>>> 
>>>  
>>> 
>>> What do you do?
>>> 
>>> ___
>>> apple-crop mailing list
>>> apple-crop@virtualorchard.com
>>> http://virtualorchard.net/mailman/listinfo/apple-crop
>>> 
>>>  
>>> 
>>> Win Cowgill
>>> 
>>> Apple-Crop Co-Founder
>>> 
>>> Professor Emeritus, Rutgers, the State University
>>> 
>>> Visiting Scholar, UMASS-Amherst
>>> 
>>> CEO- Win Enterprises International, LLC
>>> 
>>> Editor Horticultural News
>>> 
>>> PO Box 143
>>> 
>>> Baptistown, NJ 08803
>>> 
>>> Office 908-489-1476
>>> 
>>> Fax- 908-996-6404
>>> 
>>> Email: wincowg...@mac.com
>>> 
>>> www.wincowgill.com
>>> 
>>> www.virtualorchard.net/
>>> 
>>> http://giselacherry.com/ 
>>> 
>>> http://virtualorchard.net/njfruitfocus/index.html
>>> 
>>> http://www.appletesters.net
>>> 
>>> http://nc140.org
>>> 
>>> Twitter  @mrsuncrisp
>>> 
>>>  
>>> 
>>> ___
>>> apple-crop mailing list
>>> apple-crop@virtualorchard.com
>>> http://virtualorchard.net/mailman/listinfo/apple-crop
>>> 
>>> ___
>>> apple-crop mailing list
>>> apple-crop@virtualorchard.com
>>> http://virtualorchard.net/mailman/listinfo/apple-crop
>> 
>> 
>> -- 
>> Doug Nelson
>> President
>> Nelson Multimedia Inc.
>> 
>> 
>> ___
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>> http://virtualorchard.net/mailman/listinfo/apple-crop
> 
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Re: [apple-crop-2] What to do when fireblight hits tall spindle

[maurice tougas]

Do you see long vertical cankers, dark brown streaking, cracking bark?


On 7/20/18, Doug Nelson  wrote:
> hugh makes me think i dont have fire blight given his description. What I
> have happening is clusters of trees (about 4 or 5 per cluster in 3
> different clusters) across my 6000 tree orchard. When the tree becomes
> symptomatic all the leaves brown and the entire tree seems to dies withing
> 5 days- all the leaves become droopy then brown at once. Maybe this is
> something else happening? Attached are pictures.
> [image: 22297.jpeg]
> [image: 22289.jpeg]
> [image: 22291.jpeg]
> [image: 22301.jpeg]
>
> On Thu, Jul 19, 2018 at 7:45 AM Kari Peter  wrote:
>
>> Pruning out fire blight this time of year can be tricky depending how
>> much
>> fire blight you are pruning out.  Excessive pruning will encourage more
>> shoot growth = more shoot growth means susceptible shoots to fire blight
>> right now especially with conditions favorable for disease.  Trees should
>> be hardened off right now meaning new shoot growth should be finished.
>> When this occurs, the bacteria stops moving in the trees and new fire
>> blight incidence should stop.  I would highly recommend avoiding doing
>> anything that would encourage new shoot growth right now.  If it were me,
>> I
>> would just wait until the dormant period to aggressively remove
>> everything.  There is much debate about cleaning pruning shears between
>> cuts.  I don’t recommend it because the bacteria can move 3 feet beyond
>> the
>> site of visible infection, so disinfesting is a moot point.  Here is my
>> latest article (June 26, 2018) in Penn State Fruit Times about what to do
>> about fire blight now (it’s just below the info about apple scab):
>>
>>
>>
>> https://extension.psu.edu/mid-season-tree-fruit-disease-update
>>
>>
>>
>> And a note: do not spray any streptomycin.  Streptomycin is for bloom
>> time
>> only, and after a trauma event, such as hail. Do not spray it beyond
>> these
>> times.  If you are concerned about new shoot growth (if this is a new
>> orchard pushing right now), I would recommend Cueva to limit spread of
>> shoot blight.
>>
>>
>>
>> Kari Peter, Ph.D.
>> Assistant Research Professor - Tree Fruit Pathology
>> Department of Plant Pathology and Environmental Microbiology
>> Penn State Fruit Research and Extension Center
>> 290 University Dr., P.O. Box 330
>> Biglerville, PA 17307-0330
>>
>> Office: 717-677-6116 Ext. 223
>> Fax: 717-677-4112
>> E-mail: ka...@psu.edu
>> <https://webmail.psu.edu/webmail/shell.cgi?timestamp=1362517824>
>>
>> Twitter: https://twitter.com/drtreefruit
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *From:* apple-crop-boun...@virtualorchard.com [mailto:
>> apple-crop-boun...@virtualorchard.com] *On Behalf Of *Hugh Thomas
>> *Sent:* Thursday, July 19, 2018 1:14 AM
>> *To:* Apple-crop discussion list
>> *Subject:* Re: [apple-crop-2] What to do when fireblight hits tall
>> spindle
>>
>>
>>
>> Doug, it's sort of complicated. First, you probably know the bacteria
>> travels from the tip downwards. The idea is to cut well below where the
>> infection has traveled. You can cut away some bark and see where the
>> brown
>> area meets green cambium. I cut pass this point - well past it. I'm
>> guessing I would cut about three times the length of the affected area.
>> For
>> example, if the tip has died back 6 inches, I would remove 18 inches of
>> that limb. This is my gut but but this has worked for me in the past. I
>> don't know the extent of your knowledge, but you need to be careful not
>> to
>> spread the bacteria with your tools and hands. Some people dip their
>> tools
>> in alcohol or Clorox between cuts. I use Clorox wipes on my shears,
>> making
>> sure I use a fresh wipe almost every cut, as the wipe ought to be very
>> wet.
>> On small limbs, say a quarter of an inch or less, I rip the limb off. The
>> big thing is, take action now!!  With warm weather you can get a lot of
>> damage. If you burn the limbs, don't let the smoke drift into your
>> orchard
>> - something a guy told me
>>
>> Sent from my iPhone
>>
>>
>> On Jul 18, 2018, at 10:24 PM, "wincowg...@centurylink.net" <
>> wincowg...@centurylink.net> wrote:
>>
>> Doug- where are you located?
>>
>> What rootstock(s)?
>>
>> What cultivars?
>>
>> How old are the trees in your tall spindle?
>>
&g

Re: [apple-crop-2] What to do when fireblight hits tall spindle

[Vincent Philion]

Seems my previous attempt never reached the listserv:


I entirely agree with Kari (Hi Kari!),

The Terminal bud is the best solution for stopping fire blight. Once growth 
stops, you don’t have to worry about hail or anything else.

So at this point, I would also recommend waiting after harvest. You could 
consider keeping your picking staff an extra few days to clean up the fire 
blight if that’s possible.

When trees are actively growing, different story:

Quick Pruning is extremely useful when the first symptoms appear. We consider 
cleaning shears a hassle. It just slows down operations without measurable 
benefit.

Making sure pruning crews are aware that they CAN spread the disease if they 
are careless is much more useful than sterilizing.




Vincent Philion, agr., M.Sc.
Microbiologiste/Phytopathologiste (pomiculture)

Institut de recherche et de développement en agro-environnement
Research and Development Institute for the Agri-Environment

www.irda.qc.ca

Centre de recherche
335, Rang des Vingt-Cinq Est
Saint-Bruno-de-Montarville (Québec)  J3V 0G7

vincent.phil...@irda.qc.ca

Bureau: 450 653-7368 poste 350
Cellulaire: 514-623-8275
Skype: VENTURIA
Télécopie: 450 653-1927

Verger expérimental
330, Rang des vingt-cinq Est
Saint-Bruno-de-Montarville (Québec)  J3V 4P6
Téléphone et télécopieur : 450 653-8375
Local pesticide: 450-653-7608

Fiers héritiers du travail des frères Saint-Gabriel: 
http://arboretum8gabrielis.wordpress.com




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Re: [apple-crop-2] What to do when fireblight hits tall spindle

[Vincent Philion]

I entirely agree with Kari (Hi Kari!),

The Terminal bud is the best solution for stopping fire blight. Once growth 
stops, you don’t have to worry about hail or anything else.

So at this point, I would also recommend waiting after harvest. You could 
consider keeping your picking staff an extra few days to clean up the fire 
blight if that’s possible.

When trees are actively growing, different story:

Quick Pruning is extremely useful when the first symptoms appear. We consider 
cleaning shears a hassle. It just slows down operations without measurable 
benefit.

Making sure pruning crews are aware that they CAN spread the disease if they 
are careless is much more useful than sterilizing.




Vincent Philion, agr., M.Sc.
Microbiologiste/Phytopathologiste (pomiculture)

Institut de recherche et de développement en agro-environnement
Research and Development Institute for the Agri-Environment

www.irda.qc.ca

Centre de recherche
335, Rang des Vingt-Cinq Est
Saint-Bruno-de-Montarville (Québec)  J3V 0G7

vincent.phil...@irda.qc.ca

Bureau: 450 653-7368 poste 350
Cellulaire: 514-623-8275
Skype: VENTURIA
Télécopie: 450 653-1927

Verger expérimental
330, Rang des vingt-cinq Est
Saint-Bruno-de-Montarville (Québec)  J3V 4P6
Téléphone et télécopieur : 450 653-8375
Local pesticide: 450-653-7608

Fiers héritiers du travail des frères Saint-Gabriel: 
http://arboretum8gabrielis.wordpress.com




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Re: [apple-crop-2] What to do when fireblight hits tall spindle

[Kari Peter]

Pruning out fire blight this time of year can be tricky depending how much fire 
blight you are pruning out.  Excessive pruning will encourage more shoot growth 
= more shoot growth means susceptible shoots to fire blight right now 
especially with conditions favorable for disease.  Trees should be hardened off 
right now meaning new shoot growth should be finished.  When this occurs, the 
bacteria stops moving in the trees and new fire blight incidence should stop.  
I would highly recommend avoiding doing anything that would encourage new shoot 
growth right now.  If it were me, I would just wait until the dormant period to 
aggressively remove everything.  There is much debate about cleaning pruning 
shears between cuts.  I don’t recommend it because the bacteria can move 3 feet 
beyond the site of visible infection, so disinfesting is a moot point.  Here is 
my latest article (June 26, 2018) in Penn State Fruit Times about what to do 
about fire blight now (it’s just below the info about apple scab):

https://extension.psu.edu/mid-season-tree-fruit-disease-update

And a note: do not spray any streptomycin.  Streptomycin is for bloom time 
only, and after a trauma event, such as hail. Do not spray it beyond these 
times.  If you are concerned about new shoot growth (if this is a new orchard 
pushing right now), I would recommend Cueva to limit spread of shoot blight.

Kari Peter, Ph.D.
Assistant Research Professor - Tree Fruit Pathology
Department of Plant Pathology and Environmental Microbiology
Penn State Fruit Research and Extension Center
290 University Dr., P.O. Box 330
Biglerville, PA 17307-0330

Office: 717-677-6116 Ext. 223
Fax: 717-677-4112
E-mail: 
ka...@psu.edu<https://webmail.psu.edu/webmail/shell.cgi?timestamp=1362517824>
Twitter: https://twitter.com/drtreefruit




From: apple-crop-boun...@virtualorchard.com 
[mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of Hugh Thomas
Sent: Thursday, July 19, 2018 1:14 AM
To: Apple-crop discussion list
Subject: Re: [apple-crop-2] What to do when fireblight hits tall spindle

Doug, it's sort of complicated. First, you probably know the bacteria travels 
from the tip downwards. The idea is to cut well below where the infection has 
traveled. You can cut away some bark and see where the brown area meets green 
cambium. I cut pass this point - well past it. I'm guessing I would cut about 
three times the length of the affected area. For example, if the tip has died 
back 6 inches, I would remove 18 inches of that limb. This is my gut but but 
this has worked for me in the past. I don't know the extent of your knowledge, 
but you need to be careful not to spread the bacteria with your tools and 
hands. Some people dip their tools in alcohol or Clorox between cuts. I use 
Clorox wipes on my shears, making sure I use a fresh wipe almost every cut, as 
the wipe ought to be very wet. On small limbs, say a quarter of an inch or 
less, I rip the limb off. The big thing is, take action now!!  With warm 
weather you can get a lot of damage. If you burn the limbs, don't let the smoke 
drift into your orchard - something a guy told me

Sent from my iPhone

On Jul 18, 2018, at 10:24 PM, 
"wincowg...@centurylink.net<mailto:wincowg...@centurylink.net>" 
mailto:wincowg...@centurylink.net>> wrote:
Doug- where are you located?
What rootstock(s)?
What cultivars?
How old are the trees in your tall spindle?
What was your fireblight control program at bloom?
any post bloom program(s)

Win

On Jul 18, 2018, at 9:26 PM, Doug Nelson 
mailto:doug.nel...@nelsonmultimedia.com>> 
wrote:

I appear to have fireblight popping up in my orchard. The ipm group tells me to 
prune all limbs back to central leader and not to do any spraying.

What do you do?
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Win Cowgill
Apple-Crop Co-Founder
Professor Emeritus, Rutgers, the State University
Visiting Scholar, UMASS-Amherst
CEO- Win Enterprises International, LLC
Editor Horticultural News
PO Box 143
Baptistown, NJ 08803
Office 908-489-1476
Fax- 908-996-6404
Email: wincowg...@mac.com<mailto:wincowg...@mac.com>
www.wincowgill.com<http://www.wincowgill.com>
www.virtualorchard.net/<http://www.virtualorchard.net/>
http://giselacherry.com/
http://virtualorchard.net/njfruitfocus/index.html
http://www.appletesters.net
http://nc140.org
Twitter  @mrsuncrisp<https://twitter.com/mrsuncrisp>

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Re: [apple-crop-2] What to do when fireblight hits tall spindle

[Hugh Thomas]

Doug, it's sort of complicated. First, you probably know the bacteria travels 
from the tip downwards. The idea is to cut well below where the infection has 
traveled. You can cut away some bark and see where the brown area meets green 
cambium. I cut pass this point - well past it. I'm guessing I would cut about 
three times the length of the affected area. For example, if the tip has died 
back 6 inches, I would remove 18 inches of that limb. This is my gut but but 
this has worked for me in the past. I don't know the extent of your knowledge, 
but you need to be careful not to spread the bacteria with your tools and 
hands. Some people dip their tools in alcohol or Clorox between cuts. I use 
Clorox wipes on my shears, making sure I use a fresh wipe almost every cut, as 
the wipe ought to be very wet. On small limbs, say a quarter of an inch or 
less, I rip the limb off. The big thing is, take action now!!  With warm 
weather you can get a lot of damage. If you burn the limbs, don't let the smoke 
drift into your orchard - something a guy told me

Sent from my iPhone

> On Jul 18, 2018, at 10:24 PM, "wincowg...@centurylink.net" 
>  wrote:
> 
> Doug- where are you located?
> What rootstock(s)?
> What cultivars?
> How old are the trees in your tall spindle?
> What was your fireblight control program at bloom? 
> any post bloom program(s)
> 
> Win
> 
>> On Jul 18, 2018, at 9:26 PM, Doug Nelson  
>> wrote:
>> 
>> I appear to have fireblight popping up in my orchard. The ipm group tells me 
>> to prune all limbs back to central leader and not to do any spraying. 
>> 
>> What do you do?
>> ___
>> apple-crop mailing list
>> apple-crop@virtualorchard.com
>> http://virtualorchard.net/mailman/listinfo/apple-crop
> 
> Win Cowgill
> Apple-Crop Co-Founder
> Professor Emeritus, Rutgers, the State University
> Visiting Scholar, UMASS-Amherst
> CEO- Win Enterprises International, LLC
> Editor Horticultural News
> PO Box 143
> Baptistown, NJ 08803
> Office 908-489-1476
> Fax- 908-996-6404
> Email: wincowg...@mac.com
> www.wincowgill.com
> www.virtualorchard.net/
> http://giselacherry.com/ 
> http://virtualorchard.net/njfruitfocus/index.html
> http://www.appletesters.net
> http://nc140.org
> Twitter  @mrsuncrisp
> 
> ___
> apple-crop mailing list
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