[NAFEX] Disease resistant apples for Minnesota-Keepsake
Mark & Helen Angermayer
hangermayer at isp.com
Tue Apr 24 23:37:03 EDT 2007
What about Keepsake? It's listed as intermediate scab resistance. I'm
thinking at some point I'd like to try growing it. Is it realistic to think
it can be grown without fungicide in an area that gets about 40 inches of
----- Original Message -----
From: "Terry Bradshaw" <>
To: <nafex at lists.ibiblio.org>
Sent: Tuesday, April 24, 2007 6:21 AM
Subject: Re: [NAFEX] Disease resistant apples for Minnesota
> These charts should always be read with a grain of slat. There is a big
difference between disease resistance (don't get it as bad as others) and
what has been called field immunity (Scab: Liberty, Freedom, Crimson Crisp,
etc.). Yes, I know that Vf resistance can be broken down, but for all
intents and purposes most of the PRI and NY SRC (scab resistant cultivar)
releases can avoid scab sprays. The resistances listed in the table are a
varying scale of how bad the variety gets scab (in particular, and my
disease of focus here). Honeycrisp gets leaf scab, but I've never seen
fruit scab although we do spray ours, even if some get organic controls. It
gets black rot something wicked, though. In my experience Paulared requires
a full fungicide program for scab, and extra attention to powdery mildew and
fire blight. Zestar! gets scab for us as bad as McIntosh.
> Local conditions may play a role, but I would hesitate to plant an
orchard, expecting not to spray any fungicides, based on this table.
> My $0.02
> This is an interesting tabulation of resistance and susceptibility
> to several diseases for a number of mostly older apples grown by
> householders in Minnesota.
> I was interested to see a reminder of why Wolf River is a pretty good
> utility apple for zone 4 even if it's a bit on the bland side in
> flavor. In my limited experience the texture is quite nice when
> grown here in the Niagara Peninsula in Agriculture Canada zone 7a,
> near the northern limit of commercial peach growing.
> Doug Woodard
> St. Catharines, Ontario, Canada
> Terence Bradshaw
> Calais, VT 1450 feet, zone 4
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