unknown Aroid disease

[Adam Fikso]

Barry?  It looked bacterial to me, too--and probably Erwinia carotovorum--
if not wind-borne, then perhaps water-borne from splashes.  If it were my
plant,I'd give it an aspirin drench in addition to the chlorine bleach
wash.  I agree that disinfecting the tools and pots and the entire area
cannot be over-emphasized if these are grown indoors. I assumed that
Gerfried was growing outdoors. Part of the reason that Erwinia is hard to
control is because the bacterium lyses the tissue in advance of the apparent
infection, and if say, one excises the apparently affected part, one has
only removed the part that is already dead, not the part that is also
already infected.




----- Original Message -----
From: "Barry Yinger" <asiatica at NNI.COM>
To: <ARISAEMA-L at NIC.SURFNET.NL>
Sent: Tuesday, November 01, 2005 10:59 AM
Subject: Re: unknown Aroid disease


Probably a bacterial disease, these can be fast-spreading and hard to
control with chemicals. Cultural practices encourage these diseases.
Affected plants should be unpotted, washed free or soil and disinfected
with a ten percent bleach solution or a commercial product such as
Greenshield or Zerotol. The growing area and all pots and tools should
be disinfected too. Report in new well-drained mix and if possible move
plants to a new growing area. Watch watering and allow plants to dry
some between watering.


On Nov 1, 2005, at 11:18 AM, Adam Fikso wrote:

> Gerfried. This is my opinion, because I am by no means an expert in this
> area, nor did you provide enough information to be able to more than risk
> a guess. When did this occur? What are your growing conditions? soil?
> drainage? exposure to direct sun? climatic conditions just before you
> noticed the problem? what month?
>
> My guess is this: You are growing them in too rich a mix (too much
> fertilizer), drainage is not quite sufficient. The wilt began occurring
> after a wet, cold,cloudy period and was then followed by a dry period.
> Best guess, the plants don't get enough direct light and they're too wet,
> and what you have there is a surface infection (wind-blown) brought on by
> poor growing conditions and insufficient air circulation.