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  • From: david.maxwell@dal.ca
  • To: 'North American Fruit Explorers' <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] apple tree sudden death
  • Date: Fri, 22 Jul 2011 14:03:20 -0300

Nope. Area is well drained, arguably too dry. Trees on either side (8 ft.
away) are healthy.
Foliage is not bronzed, but paler than adjacent trees. And, yes, O-3 is
supposed to be
resitant to Phytophthora.

> David,
> My best is phytophthora root rot. Any chance that the drainage is
> less than wonderful in that spot?
>
> Here is some more phytophthora information:
> http://www.cals.ncsu.edu/course/pp728/cactorum/Pcactorum.html
>
> The Ottawa rootstock is supposedly resistant to Phytophthora, so
> perhaps that guess is in left field. Apple experts!! What could it
> be?
>
> Michele in SW Ohio
>
>
> -----Original Message-----
> From: nafex-bounces@lists.ibiblio.org
> [mailto:nafex-bounces@lists.ibiblio.org] On Behalf Of
> david.maxwell@dal.ca Sent: Thursday, July 21, 2011 1:15 PM To:
> nafex@lists.ibiblio.org Subject: [NAFEX] Dying tree
>
> One tree in my orchard has decided to die in the past few days, and I
> have no idea what could be the cause. Any thoughts or advice greatly
> appreciated. The tree in question is cv. Gideon, on Ottawa-3
> rootstock, about 7 years old. It has suddenly wilted - all the leaves
> are drooping, the fruit is starting to dry up and wrinkle. It is not
> black, nor are there shepherd crook deformities to suggest fireblight.
> It is just wilting. The trunk looks entirely intact. No sign of
> borers, (which I do have elsewhere in the orchard). No holes
> suggestive of voles eating the roots. Tree on either side look fine.
> There are a number of healthy-looking root suckers springing up,
> suggesting to me that the roots are in fact OK, and the problem lies
> in something plugging the vascular channels above ground, eg. a fungal
> disease - are there such things? I very much doubt that there is
> anything I can do to save this tree, but what should I do in terms of
> management at this point? (cut it off at ground level and use one of
> the root suckers to build a new tree? Dig the whole thing up and
> examine the root system for a clue? Any other suggestions?
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