Just my personal experience, dont know if any studies made, I think a lot of 
the problem is copper deficiancy, after doing leaf analysis, my copper levels 
were in the bottom of the scale, alsso in soil analysis, added Kocide 3000 to 
dormant spray, and small amount (2oz per 100 gal) in spring sprays, also copper 
added to herbicide spray, copper levels in leaf analysis came up but stil not 
normal, I have less  FB and can see the difference. Also, nothing beats staying 
on top of the situation by walking the orchard every morning and cut it out 
before it spreads, this works well for small orchards like mine. Most of my FB 
is shoot blight, I think strep sprays are a waste of $$$. This my be because 
the strep is old, does anyone know how to read date of manufacture  on the 
bag?? Lee Elliott,  Apple Hill/ Upstart Nursery, Winchester, Illinois
On Sat, 8/15/15, apple-crop-requ...@virtualorchard.net 
<apple-crop-requ...@virtualorchard.net> wrote:

 Subject: apple-crop Digest, Vol 56, Issue 8
 To: apple-crop@virtualorchard.net
 Date: Saturday, August 15, 2015, 11:00 AM
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 Today's Topics:
    1. Re: Looking for comments on fire blight
       (Weinzierl, Richard A)
 Message: 1
 Date: Fri, 14 Aug 2015 21:26:58 +0000
 From: "Weinzierl, Richard A" <weinz...@illinois.edu>
 To: Apple-crop discussion list <apple-crop@virtualorchard.net>
 Subject: Re: [apple-crop] Looking for comments on fire
 Content-Type: text/plain; charset="utf-8"
 U of I Kane County Extension Office, 535 South Randall Road,
 St. Charles, IL
 From: apple-crop-boun...@virtualorchard.net
 On Behalf Of Vincent Philion
 Sent: Friday, August 14, 2015 12:49 PM
 To: Apple-Crop <apple-crop@virtualorchard.net>
 Subject: Re: [apple-crop] Looking for comments on fire
 blight management
 Hi Tim! nice to read you!
  I think there are more sources of fire blight bacteria in
 the general environment in the northeastern USA due to your
 woodlots and forests (with feral apples and native hosts
 such as Hawthorne)  as contrasted with the treeless
 conditions around many eastern Washington orchards.
 I agree! But still is fascinating to see whole areas without
 FB and others with FB, despite similar weather.
 We often make ?false positive? predictions because of this =
 conditions are great for FB, but not FB develops because
 bacteria are simply not there. We have nice qPCR data
 throughout bloom to prove it.
  The bacteria (in the hypanthium) need to thrive in the
 nectary in order to reach numbers sufficient to switch on
 their virulence. Once this is accomplished you have an
 Do you have a good reference for me on this specific topic?
 When I reviewed the literature, I only found a few things
 from Pusey. This might explain some cases.
 We can learn a great deal about interpreting models by
 looking at the weather data around the time that we are
 fairly certain that isolated infection events
 occurred.  We can also look at when expected infections
 did not occur.   It would be very helpful to
 me if any of you would share weather data including
 rainfall, hourly temperature (or daily temps) and especially
 leaf wetness readings.  Please send data that covers
 days from first bloom to about 3 to 4 weeks after petal
 fall.  Excel files are a real time saver.
 We?re Also looking for the same type of data?!
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