Re: CULT: aspects of rot - long
- Subject: Re: [iris-talk] CULT: aspects of rot - long
- From: "Donald Eaves" d*@eastland.net
- Date: Wed, 2 Oct 2002 20:50:09 -0500
Bill,
>> How far along had the rot progressed?
>
>The rhizome was thumb size, the variety was Peace and Harmony. The
>progression is about 25%. The foliage had not yet deterioated. Also of
>interest is the point at which the rot begins, or at least where it
surfaces.
>It starts 1/3 of the rhizomes length form the oldest end of the rhizome.
The
>rhizome itself has only a minute wound where it was detached from the
mother
>rhizome with that joint being almost completely matured at the time of
>detachment. It now appears to be attempting to generate leaf tissue from
that
>end.
>
>I will post a picture to iris pictures.
O.K. I viewed the photo. Out of the ground for a while. Should've been
quite dry before the rot set in it would seem. Else the rot would have
progressed further by this time. So how does Erwinia manage this? Does it
require only the moisture in the rhizome itself? If so, then drying the
surface would seem to be effective only if the rot has not progressed any
deeper than the surface. Does it have some kind of feeding network where it
can invade healthy appearing tissue before it becomes apparent?
I think the post from Steve indicates the genetic factors involved could
potentially be really complicated. If multiple modifiers are at work and
different modifiers work/don't work under different types of stress, then it
is going to be very hard to identify cultivars that are truly rot resistant.
A theory that's going to be hard to prove one way or the other. If my
growing conditions were more consistant, then that task might be easier.
Here things vary widely - measured in hours at times, much less days, weeks
or seasons. I think this may be a Zone 7 characteristic. Perhaps the
variations aren't as great in other zones. At least when I lived in Zone 8,
while they were often not very amenable to growing things, what occurred was
certainly more predictable.
Donald Eaves
donald@eastland.net
Texas Zone 7b, USA
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