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hardy  Aroids)" <ARISAEMA-L at NIC.SURFNET.NL> Aroids)" <ARISAEMA-L at NIC.SURFNET.NL>
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From: Adam Fikso <irisman at AMERITECH.NET>
Subject: Re: Variegated (questions)
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Adam here again.  I will add a further note to Jim Shields's comments.  I
grew orchids for many years and virus infections are a real problem there.
The cymbidium viruses do not sho up much in healthy plants, but an infect=ed
plants can be identified quickly by the appearance of portions of the lea=f
which show the bleaching of cells (as in irises) but along the entire lea=f.
In Phalaenopsis, and Cattleyas, sometimes the only appearance is a small
dark spot on the petals before it is time for the flower to normally begi=n
the usual signs of aging. Typically,the plant then very slowly weakens an=d
fails to thrive.  Transmission is not only by insect vectors,as Jim noted=,
but by trimming tools, dead leaves, soles of shoes.  The Durio nurseries =in
Louisiana for years have not allowed any cigarette smoking on their groun=ds.
Although the tobacco virus supposedly is different from the other viruses
that affect plants--There is some soft (anecdotal)    evidence  that the
tobacco virus may mutate into one of the other forms.  Nothing definitive
here, though.  I should note that all my information here is derived from
reading and interpreting what I've read from a broad knowledge- base. Thi=s
is not my specialty area.

Oiginal Message -----
From: "J.E. Shields" <jshields at INDY.NET>
To: <ARISAEMA-L at NIC.SURFNET.NL>
Sent: Tuesday, June 13, 2006 9:21 AM
Subject: Re: Variegated (questions)


> Hi folks,
>
> I'm not well informed about Arisaema variegation or diseases, but I've =run
> into plant viruses all too often over the past 30 - 40 years.
>
> Plant viruses, once in a plant, essentially never go away.  They are
> transmitted in most cases by a vector, such as aphids, mealy bugs, etc.
> All the offsets of a virus-infected plant are very likely to also carry
> the infection.  Many collectors destroy any plant that looks
> virus-infected as soon as it is discovered.  A virus infection can spre=ad