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Re: [aroid-l] amorph tuber rot problems

  • Subject: Re: [aroid-l] amorph tuber rot problems
  • From: rajshekhar misra rajshekharmisra@yahoo.com
  • Date: Fri, 2 Jan 2004 21:19:18 -0800 (PST)

Dear Dr.Taylor
A very happy new year. Tuber rot in A.paeoniifolius is
a serious problem at times. I am sure you may be
starting with healthy planting material. The soil
should be certainly well drained. Please check for
nematode population in the potting mixture.
Meloidogyne incognita infests the roots and tubers
paving way for a lot of secondary pathogens. If you
can afford to discard the infected planting material
and start with fresh planting material providing
proper soil drainage, the problem could be controlled.
--- Scott Taylor <staylor@brevardparks.com> wrote:
> Hello:  The best of the New Year to everyone and I
> enjoy the list immensely.
> 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:  I
> 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 with
> 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 away
> 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 tubers
> 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 mixture
> 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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