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Re: [aroid-l] amorph tuber rot problems

  • Subject: Re: [aroid-l] amorph tuber rot problems
  • From: "Petra Schmidt" petra@plantdelights.com
  • Date: Sun, 4 Jan 2004 10:19:52 -0500

Hello Scott,
Are you letting the tubers dry off completely before placing them into cool
storage?  And have you tried storing them in warmer temperatures (what is
your cool storage temp?).   I've seen tuber rot become a real problem with
wet cold conditions during dormancy and even during the leaf collapsing
pre-dormancy stage; we're getting tubers out of ground beds or out of cool
wet growing conditions to let them dry off in dry warmth and light before
placing them into winter storage.  Our winter storage is about 45 degrees F
and dry.
Have you tried using a powder fungicide, instead of a drench, after harvest?
Again, keeping the tubers as dry as possible once they're out of the
ground/pots is critical, in my growing experience here in North Carolina...a
liquid drench at the end of the growing season would not be a good idea here
but coating the suspected problem tubers in powdered fungicide and letting
them dry off is a better option here.
Keep us posted, please...

----- Original Message ----- 
From: "Scott Taylor" <staylor@brevardparks.com>
To: <aroid-l@lists.ncsu.edu>
Sent: Friday, January 02, 2004 4:46 PM
Subject: [aroid-l] amorph tuber rot problems

> Hello:  The best of the New Year to everyone and I enjoy the list
> I have discussed this problem with a few of you already, off list, but
> thought that I would bring it up again, as it is continuing to plague me:
> am trying to raise Am. paeoniifolius in some quantity for a few years now.
> I have been growing in containers, and I am having a continuing problem
> a 'soft-rot' of tubers after harvest.  I had some pathology work done on
> some of infected tubers last year and both Rhizopus and Verticillium spp.
> were found (fungi).   The problem typically appears a week or two after
> harvest, mostly afflicting larger tubers (> 10 cm dia).  I find it mostly
> ineffective to try and 'salvage' infected tubers: if I drastically cut
> the infected portion and coat with fungicide, the lesions continue to
> spread.  I altered my growing strategy in several ways this year: 1) brand
> new  potting soil (no more 'reuse' of soil), 2) regular soil drenches with
> fungicide (Mancozeb)- 4-5 times during the growing season, 3) drench tuber
> in fungicide after harvest.  I am growing to dormancy and handle the
> with the greatest care during and after harvest (stored cool and dry).
> However, the problem continues, to a lesser degree perhaps, but still very
> disconcerting. I suspect that one error I am making is using a soil
> that is not well enough drained, but I can't believe that with all of the
> fungicide that I am still experiencing this.  Of course, here in Florida
> where 10 cm of rain may fall on a July afternoon, a 'well-drained' mixture
> may not apply!   Any and all ideas welcome!  Many thanks!
> D. Scott Taylor, Ph.D.
> Brevard County Environmentally Endangered Lands (EEL) Program
> Central Region Land Manager
> 5560 North US Highway 1
> Melbourne, FL 32940
> tel: 321.255.4466
> FAX: 321.255.4499
> email: staylor@brevardparks.com

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