RE: Precious Doll
- Subject: RE: [sibrob] Precious Doll
- From: Ken Walkup k*@cornell.edu
- Date: Sun, 18 Sep 2005 11:33:22 -0400
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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