Re: Re: Re: Lavender

Neil:

Don't know about the causes; it could have something to do with a disruption
to the internal growth tip where new leaves are generated.  I usually break
off the pineappled greens, but pineappled rhizomes often have no increases
present, rarely seem to generate new increases and I lose most of them.  The
also seem extremely attractive to aphids, nesting inside the swollen leaf
spikes.  I don't think the aphids have anything to do with the cause, but they
are usually present on pineappled fans.

John Reeds
  ----- Original Message -----
  From: Neil A Mogensen
  To: Iris-talk
  Sent: Thursday, March 18, 2004 12:11 PM
  Subject: [iris] Re: Re: Lavender


  Thanks, John, for the remarks about POEM OF ECSTASY.

  Has there been any progress made since the mid-70's on identifying cause of
  and/or treatment for pineappling?

  As I understand it, one of the causal factors is climate--I've lived too
far
  north to see much of it.

  The apical meristem seems to lose its organization in long continued heat
or
  high soil temperatures, and I have seen a few relatively minor expressions
of
  what I assume to be the same disorder.  I think I remember someone saying a
  treatment that has had success is to slice off the growing terminal,
letting
  unaffected side increases (if any)  pick up the growth.  They could be or
  would be normal.

  Am I remembering something there accurately or just imagining it?

  The last I remember reading about the subject (I've skipped the discussion
in
  TWOI so far) was that no consistent pathogens have been found.  The cause
  remained a mystery

  Neil Mogensen  z  7 western NC

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