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Fireblight in Nova Scotia after Hurricane Arthur 2014

Posted by Claude Jolicoeur 
Fireblight in Nova Scotia after Hurricane Arthur 2014
July 29, 2014 11:03PM
This is now a couple of times I hear about this fireblight outbreak in Nova Scotia this summer. It seems the culprit could be hurricane Arthur. Interesting that a hurricane can carry the FB bacteria and inoculate it to so many trees!
see [www.herald.ns.ca]

David, are you affected by this?

Claude

Jolicoeur Orchard
Zone 4 in Quebec



Edited 1 time(s). Last edit at 07/31/2014 01:07PM by Michael Phillips.
Re: Fireblight in Nova Scotia after Arthur in summer 2014
July 30, 2014 07:24PM
The concept being put forward by Chris Duyshelov, who has been tagged as
the "expert", is that the hurricane shook the leaves, creating multiple
breaks in the cuticle, and allowing the bacteria entry. It was warm and
wet, fostering the growth of the bacteria. Whether the bacteria were
truly blown around, infecting previously virgin orchards, (as is being
suggested), or, rather, whether the bacteria are already virtually
universally distributed, and simply grow when conditions are suitable, (as
I suspect), I do not know. I did send a message to Chris asking whether
he had any information on the protective effect of competitive
colonisation (EMs); he has not responded. (The advice being offered at
present is to spray dilute copper every 10 days for the rest of the season
in young orchards, and maybe do nothing in mature orchards until the
dormant season.) I had applied Michael's 4 sprays, including EMs - did
that exert any protection?

Do I have it? Good question. In early June, (long before Arthur), some
twigs on some trees died and turned black. They did not have the typical
shepherd's crook appearance of fireblight, and the twig died back only to
the node at the base of the twig, not progressing anywhere beyond that
particular twig. I put it down to a fungal blight, (Nectria??), and since
it seemed to be self-limited, did nothing about it. The trees in question
seem quite happy, and have healthy foliage everywhere else. The hurricane
had no discernable effect, and the new growth seemed completely
unaffected. (The only damage I sustained was on one tree, a Red
Astrachan, on Ottawa-3 rootstock, which snapped cleanly off at the graft
union - an issue of incompatabiliy I think.)

There is one possibly significant, factor here. In the Valley they had
torrential rains together with the high winds. We had very lttle rain,
(but lots of wind).

Broomholm Orchard
Zone 5b in Nova Scotia
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