North American Fruit Explorers mailing list at ibiblio

["Ed Fackler" <ed.fackler@gmail.com>]

Al:

     Late season (post bloom) blight can be caused by hail, even wind trauma (often at night time when folks are unaware), leafhopper feeding (as you mention below) and stinkbug feeding.  Also the amount of host (nearby) bacteria plays a role of this incidence I think.  I suspect that hail/windstorm trauma is the most common cause (east of the Rockies anyway).

     
ed

On Nov 25, 2007 8:22 AM, Alan Haigh <alandhaigh@gmail.com> wrote:

I have been growing my own and managing for others a wide range of varieties of pears here in the vicinity of southeastern NY for almost 20 years.  Based on what I gathered from the literature, I began with the anticipation of ongoing warfare with fire blight.  Experience has not met anticipation and fire blight has not been a major issue.  On most sites, including my own orchard, I've never seen a single strike.  Knock on wood.

 

There are two sites, however, where this tree-killer has reared its ugly head but the timing of its attacks are strictly Che Guevara-  small attacks when least expected.  I've always read that fire blight occurs in the spring starting in the open blossoms with pollinaters as vector.  In the two orchards where it has appeared the symptoms did not become visible until mid-July.  In one site it hit a Bosc pear for 2 straight seasons while leaving an adjacent Bosc and a Seckel alone.  So far, Ive had to remove about 50% of the tree.

 

In the other site the strikes come about the same time and have also appeared for the 2nd season but have been more widespread 2nd time around.  The first season only the Bosc was badly damaged but this year the quinces, a red Bartlett and a Seckel also had some damage.  There was also a scattering of strikes throughout the various varieties of apples but for these trees the damage was minor.

 

I'm guessing the vector to be leaf-hoppers but that's an uneducated leap.  Does anyone out there have some information about late season fire blight?

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