Hi! we tried to restart trees by leaving a few nodes above the graft,
but failed miserably. The darn trees never re-sprouted. We had much
better success pruning out the diseased portions. We also found
sterilizing shears was a waste of time. The article can be found at:
Toussaint, V., and Philion, V. 2007. NATURAL EPIDEMIC OF FIRE BLIGHT
IN A NEWLY PLANTED ORCHARD AND EFFECT OF PRUNING ON DISEASE
DEVELOPMENT. In XI International Workshop on Fire Blight 793, ISHS, p.
313-320.
Vincent
On 18-Jun-2009, at 2:17 PM, Mark Longstroth wrote:
Good Job Allen.
I discussed that type of program Monday with a grower.
Other sad fireblight tales.
I had a grower who planted RubiJon this spring, which bloomed after
normal and now have blossom blight.
I suggested cutting back to 2 or 3 nodes above the graft union in an
effort to save the rootstock (M26) on any tree that showed any
symptoms.
He also had a block of Idared on G30 which got fireblight in the
fall (leaf hoppers?). He noticed 30 dead trees out of 150 this
winter when he pruned but about half the planting has or is
collapsing now and he will remove them all.
-----------------------------------------
Mark Longstroth
SW Michigan District Fruit Educator
Van Buren County MSU Extension
Email - longs...@msu.edu
http://web1.msue.msu.edu/vanburen/disthort.htm
-----------------------------------------
-----Original Message-----
From: apple-crop@virtualorchard.net [mailto:apple-crop@virtualorchard.net
]On Behalf Of Allen Teach - Sunrise Orchard
Sent: Thursday, June 18, 2009 1:01 PM
To: Apple-Crop
Subject: Re: Apple-Crop: Fireblight on Ernst Bosch
Gentlemen:
I certainly agree with Mark to get rid of the culprit tree
yesterday. However, let me relay an experience we had last year.
On a five acre block of 3rd leaf Honeycrisp on B9 and CG 16 (tall
spindle) we had some blossom blight on very late rat tail bloom and
began seeing sporadic shoot blight in late June. I immediately made
"ugly stub cuts" on the affected branches, fired up the sprayer and
applied Apogee to the entire block. I continued to patrol the
block and reapplied the Apogee about 3 weeks later. this is totally
unscientific but we were able to avoid a disaster. Granted
Honeycrisp/B9-CG 16 is not extremely susceptible but we had the
trees set up with water and fertilizer to grow vigorously.
Allen Teach
Sunrise Orchards Inc.
Gays Mills, WI
P.S.
Let's all dodge the severe weather the next couple of days!
----- Original Message -----
From: Axel Kratel
To: Apple-Crop
Sent: Thursday, June 18, 2009 11:18 AM
Subject: Re: Apple-Crop: Fireblight on Ernst Bosch
Mark, that sounds like good advice. Basically, I cut once, that
didn't help. I cut again. if it comes back again I will yank out the
tree.
I do have a question for the group:
When fireblight die back shows up as a result of flowers getting
rained on, which of these two reasons would cause it:
1) Fireblight is systemic in the tree
2) Fireblight was brought to the tree from an outside vector.
Thanks.
From: Mark Longstroth <longs...@msu.edu>
To: Apple-Crop <apple-crop@virtualorchard.net>
Sent: Thursday, June 18, 2009 7:36:12 AM
Subject: RE: Apple-Crop: Fireblight on Ernst Bosch
Axel,
If I had a 4 year old tree in an orchard of 200 trees with
fireblight that bad, I would yank it out of the ground today!
In my experience, 4 year old trees with that bad an infection don't
survive.
It sounds like the bacteria is running faster than you can cut and
in my experience it will run very fast in wood back through three
year old wood and in a 4 year old tree it is just a short jump to
the rootstock. MM111 is rated as moderately resistant and I doubt
it will survive with an infected susceptible scion such as you
describe. If you inject strep into the tree you might save it or
find out that you have a resistant strain in your orchard.
Do you really want a source of fireblight in your orchard while you
try to save one tree? What are you going to do if you have a storm
which spreads the infection to other trees?
Get rid of it now while the infection is only in one tree. It is
much easier to manage fireblight if you do not have a source in the
orchard.
I saw fireblight literally destroy hundreds of acres of apple trees
in 2000 here in SW Michigan. The industry still has not recovered
from that epidemic.
-----------------------------------------
Mark Longstroth
SW Michigan District Fruit Educator
Van Buren County MSU Extension
Email - longs...@msu.edu
http://web1.msue.msu.edu/vanburen/disthort.htm
-----------------------------------------
-----Original Message-----
From: apple-crop@virtualorchard.net [mailto:apple-crop@virtualorchard.net
]On Behalf Of Axel Kratel
Sent: Wednesday, June 17, 2009 12:19 AM
To: Apple-Crop
Subject: Apple-Crop: Fireblight on Ernst Bosch
Dear all,
I have an "Ernst Bosch" apple tree on MM111 that has developed a
pretty bad case of fireblight. I have over 200 trees and I've never
seen fireblight here before, so this is a first for me. Symptoms
included the classic die back with the orange colored droplets.
I've cut the infected wood, and applied serenade, and I've had to go
back twice now to cut more. I've cut back quite far, yet the cuts
are still turning orange. I disinfected sheers in between cuts. On
the last cuts I've resorted to treating the cuts with hydrogen
peroxide, but it seems hopeless.
Any hope of saving the tree or should I sacrifice it? It's on it's
fourth leaf. I am surprised that this variety is so susceptible. The
literature claims it's not especially sensitive to fireblight.
Thanks for your advice. I am willing to forgo organic to save a
tree, so if there's any sort of systemic treatment that would be
possible, I would consider it. Serenade is a good preventative, but
it's too late for this tree.
Vincent Philion, agr., M.Sc.
Phytopathologiste
Laboratoire de production fruitière intégrée
Institut de recherche et de développement en agroenvironnement
335, Rang des vingt-cinq Est
Case postale 24
Saint-Bruno-de-Montarville (Québec) J3V 4P8
Tél. bureau: 450 653-7368 poste 224
Tél. laboratoire: 450 653-7368 poste 229
Cellulaire: 514-623-8275
Autre: 802-659-4282
Télécopie: 450 653-1927
Verger du parc national du Mont-Saint-Bruno
330, Rang des vingt-cinq Est
Case postale 24
Saint-Bruno-de-Montarville (Québec) J3V 4P8
Téléphone et télécopieur : 450 653-8375
Courriel: vincent.phil...@irda.qc.ca
Site Internet: www.irda.qc.ca
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