RE: Precious Doll

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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Attachment: Precious Doll.jpg
Description: JPEG image


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