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  HELP Amorphophallus konjac
From: "Martin Neitz" martin_neitz at hotmail.com> on 2002.10.20 at 13:01:24(9569)
Dear all,

Today was harvest day for all the nice A konjac tubers :) ... and
two of my big konjac does look very sick... the tuber looks like they
where in the micro-wave for about 30 minutes...

does anybody has an idea what it is?
can it be a virus which may infect the rest of the tuber?
should I trash the tuber an simply forget it?
is their anything I can do for the tuber?

their are some pictures where you can see the cause... the "cuts" are about
2cm deep...

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From: "Petra Schmidt" petra at plantdelights.com> on 2002.10.23 at 10:24:41(9574)
I've not seen tuber problems like those in your photos, but I'd suggest that
you cut the infected areas away and see what the tissue looks like beneath
it...if clean, then just use some powdered fungicide on the cleaned cuts and
let the tuber dry out. The tuber should force out some new growing points
later on. If the tissue beneath the infected areas looks equally infected,
toss them out.
Were these growing in the ground or in pots? The damage almost looks like a
burn. Keep us posted.
Petra

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From: "Wilbert Hetterscheid" hetter at worldonline.nl> on 2002.10.24 at 10:36:32(9578)
Guys, this is probably the result of Fusarium infection. Fusarium settles in
the oputer layers of the tuber and prohibits that layer from growing as fast
as it should, hence the inner part of the tuber sort of "bursts" through the
suboptimal outer layer. It is a weakness disease and means that the plants
have not grown under optimal conditions. Next season, try to scrape off the
old, infested layers, which are usually a bit spongy/corky and replant and
try to optimise conditions. You may ask the horticultural experts in this
group if there is a pesticide in the USA for battling this. if the cracks
are too deep there IS the danger of desiccation during dormancy. You may
indeed want to seal the cracks with a paste.

Lord P.

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