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amorphophallus SICK Looking bulb HELP
From: "Greg Dorst" <gregg1- at charter.net> on 2004.11.15 at 14:11:11(12380)
If it is injured or sick it finds its way to my house.
Paeoniifolius Bulb, received from my friend, appears to have an injury
from possible digging instrument used for its removal. It has been out of
the soil for about 4 weeks. The gash is about 7" long and 4" wide. Ya it
is a nice size one for sure. I have used a spoon yesterday 11-14-04 and
removed the "Mush" and "decay", and some seemingly discolored tissue up to
the point of clean healthy flesh. I would like to save this bulb if
possible. There is a few spots remaining which appear as slight
discoloration ( dark spots ) but still, "semi firm" that would require
deeper and more radical tissue insult to remove. I would say that I
extracted a good 15% of the bulbs mass. Is there anything else which I
should do other than say a prayer? Is the extraction of the decay the
proper means to save the bulb? Is there a wonder application to end future
decay? The soil the plant was in, is it considered contaminated? My
suggestion to that was, " dump it and avoid the risk of any possible
From: "Michael Marcotrigiano" <mmarcotr at email.smith.edu> on 2004.11.15 at 14:38:07(12381)
If you know someone with a greenhouse that has a supply of fungicides
you may want to apply Banrot (trade name) to the cut. It can be used as
a powder and is often used for tuberous begonia etc and other easy to
rot storage organs. Don't ask me where to get it but I have seen it used
at a few places.
From: Ron Kaufmann <kaufmann at sandiego.edu> on 2004.11.15 at 14:54:15(12382)
Dusting the wound with powdered sulfur can be very effective in stopping
the rot. Since most people (myself included) don't have powdered sulfur just
lying around the house, a very good alternative can be powdered cinnamon. I've
had very good luck saving tubers by doing exactly what you did, coating the
exposed area with powdered cinnamon, and allowing the cinnamon to dry.
From: "D. Scott Taylor" <staylor at brevardparks.com> on 2004.11.16 at 14:35:37(12384)
I have posted previously a couple of times about similar problems I
have had with paeoniifolius, and based on those communications I have
surmised that it can be a 'problem' species. Now I am wondering/hoping
that some clones are maybe less subject to this disorder. I have had
ongoing problems with 'rot' in this species, particularly with larger
tubers. I have tried cutting away the rot area and treating with
fungicides (I have tried Captan and Mancozeb). I have also tried
sulfur and treating lesions with bleach: sometimes this works and
sometimes not: often the rot will continue until much of the tuber is
consumed. Oddly enough, when I get rot on konjac, the simple cutting
away of the lesion seems to solve the problem, so these two species
seem different in this regard. The recommendation I have had is that
damaged tubers not be replanted, and also do not reuse planting media.
A well-drained media is also supposed to be very important. I have
tried drenching the soil with Mancozeb throughout the growing season,
and this really didn't seem to help; my suspicion at this point is the
the problem may not be fungal in origin: in fact, I have sent two
different samples to path labs with no definitive results. This
remains somewhat of a (frustrating!) mystery!!!
D. Scott Taylor
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