RE: Precious Doll

Hi Bob,
         One of the recommendations I got was to improve the soil 
drainage.  So, over the last few years I've added lots of coarse sand to 
the native heavy clay.  That may be a factor in what seems to be a 
decreasing problem.  Adding hardwood bark chunks has also been recommended, 
presumably because that improves drainage too.  I have also read that 
shallow tilling is good since it exposes more of the pathogen to the 
elements.  I'd love to be able to rotate the crop, but that's not happening 
unless I add more garden space.
         I remember I wanted to cross Precious Doll with Isabelle; don't 
know why I never got around to it.
         Ken
At 10:03 PM 9/24/2005, you wrote:
>Ken -- You're not the only one to have had serious root rot problems.
>I lost a whole year of seedlings to it back in the 80s -- virtually
>every one! I had planted the seedlings in the same soil as the
>previous Siberian seedling crop and obviously some soil pathogen had
>built up and was lurking. The good news -- having no other place to
>put the next year's crop, we put a few inches of new soil on that
>same area and tilled it shallowly, then planted the seedlings with
>finger's crossed. Those seedlings grow beautifully with no sign of
>disease. It was one of our best seedling years ever -- it gave
>Coronation Anthem, Strawberry Fair, Shall We Dance and Simple Gifts!
>Since then, though, I have tried never to plant new seedlings where
>old ones have grown. I don't know if this experience helps, but if
>all else fails, maybe you could try raising the growing area by
>adding a bunch of new, and presumably clean, soil. By the way I think
>I did cross Precious Doll with a 6-petal type, but I don't think it
>set any seed. The photo attached shows the partial 6-fall pattern on
>PD (fall pattern starting to show on two of the three standards,
>though not very strongly developed). Bob
>
>
>At 11:33 AM 9/18/2005, you wrote:
> >Bob,
> >          I have had Cornell Plant Path. do analyses twice.  They ID'd
> >Pythium ssp. and Fusarium, different times.  I have done a lot of reading
> >on line about this, mostly at cooperative extension web sites, and it seems
> >if you have one of these bad guys, you are likely to have several of
> >them.  The way they present, the plants look pretty much OK until bloom
> >time; then they start browning off as the hot weather begins.  The heat
> >stress makes it worse.  I'm now using a rotation of two chemicals for each
> >of two classes of organism, plus Plantshield, which is a biological control
> >you can use along with the fungicides.  I believe I am getting the problem
> >under control, but I certainly have lost some plants I really didn't want
> >to lose.
> >          I think I got this problem by using compost from a pile maintained
> >by Cornell, from their horse barns and landscaping.  It may not have been
> >quite finished, and I urge anyone out there who's using a municipal compost
> >source to be careful.  Ask questions about what's in it, and be sure to let
> >it age.  But I can't rule out having gotten it from mail order
> >irises.  What I really don't understand is why I'm the only one who seems
> >to have a problem with this.  I wonder what heinous acts I committed in a
> >past lifetime to deserve this?
> >          Ken
> >At 09:40 AM 9/16/2005, you wrote:
> > >Oh yes Ken, I forgot -- have you been able to identify the causative
> > >organism for the root rot? Bob
> > >
> > >
> > >
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