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  • From: Claude Jolicoeur <cjoli@gmc.ulaval.ca>
  • To: "nafex@lists.ibiblio.org" <nafex@lists.ibiblio.org>
  • Subject: Re: [nafex] crab apple disease resistance
  • Date: Mon, 7 Apr 2014 16:26:36 -0400

Hello Devin,
I guess my own experience is not quite like yours. True, crabs that have a lot of Malus baccata (the Siberian crab) are most often scab resistant. But I have seen crabs that were quite severely affected by scab.
As of insects, I can tell you that I have a great crab here that is the most severely affected variety in my orchard by the European Sawfly. It does also get some maggot, although not as much as some other varieties.
So it is pretty hard to say for sure that planting crabs will insure you clean fruit...
Claude

where there is still a good 3 feet of snow on the ground!


Le 17:39 2014.04.06, vous avez écrit:
A picture and caption I noticed at the recent Maine Tree Crop Alliance Scionwood
Swap reminded me of an idea/question that has long been brewing in my
mind about the seeming resistance of crab apples to all manner of bugs
and insects. Perhaps its not surprising that bugs in particular would go for the big choice fruits given the chance. Still, it seems that there
is some mystery to be uncovered here. It just doesn't seem that crab
apple trees typically suffer from the onslaught of plague and pestilence here in the northeast. Maybe the fruits are just so small and numerous
that the curculio riddled drops aren't noticeable? Still doesn't explain the blemish free fruit festooning every branch. I suppose high levels of tannins could be a factor. Still, it seems that some of the better eating crabs are quite often free of blemishes somehow. Whatever the explanation, are similar
mysterious forces at work when it comes to summer apples. It seems that
Transparent apples, for one, seem to suffer little if any damage. Has
anyone else noticed this, and if so, how do you explain it? At the swap
this year, I focused largely on getting some choice crab varieties in the hopes that these might prove quite a bit easier to grow. Any thoughts?.
-Devin Smith
Witness Oak Polycultures
Rockingham, VT
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