Re: arisaema rust/mayapple rust/

Anybody know if Daconil is effective against powdery mildew? I can't seem
to keep the stuff off my Pulmonarias.

Gerry

At 08:43 PM 5/12/00 -0400, you wrote:
>Knew the good folks on Trillium-L would know about the mayapple
>rust...got two replies, both from very knowledgeable people.
>
>Dr. Jim Waddick says this is fairly common on his local wild
>populations of Podophyllum on an irregular- depends on the season-
>basis with some plants getting it badly but it doesn't seem to harm
>them in the long run.  He thinks it's just an opportunist fungi and
>relatively harmless.
>
>Jim McClements says he's noted it both last year and this year, more
>on some special seedlings than adult plants and including some of the
>Chinese species.  He checked with Barry Yinger (Asiatica Nursery) who
>imports and sells a lot of the Chinese species. Barry says it's not
>the same fungus as the Arisaema rust and doesn't seem as serious.
>Barry uses Daconil to combat it, which he says works well for him.
>Jim used the Daconil once and hasn't seen more infected plants since.
>
>Personally, I'm relieved to find it's not as virulent as the Arisaema
>rust, tho' I've not seen it on my populations of mayapple (knock on
>wood).
>
>Rust fungi (as well as hundreds of other disease fungi) are all
>around all the time.  Most plants have a high tolerance for them and
>survive with either disfigurement or some damage...rather like we
>humans deal with the various bacteria and virus (viri?..what is
>plural of virus?)  floating around us all the time.
>
>I have never used Daconil, but search results appear to indicate it
>is widely used for turf diseases. The Biocontrol In Greenhouses web
>page
>
>http://ipmwww.ncsu.edu/biocontrol/2a.htm/
>
>seems to indicate it as one of the products which most predator
>insects can tolerate.  Appears the primary ingredient is
>chlorothalonil.  Extoxnet has a page on this with everything you'd
>ever want to know about its toxicity to humans and other critters.
>Appears it's fairly benign except for fish.
>
>http://pmep.cce.cornell.edu/profiles/extoxnet/carbaryl-dicrotophos/chl
>orothalonil-ext.html
>
>So, seems as though, if you want to try using a control, Daconil - or
>some formulation of it, appears that there are several - should be
>worth trying.  As with any fungicide or pesticide, proper precautions
>need to be taken and instructions on the package followed.
>
>Marge Talt, zone 7 Maryland
>mtalt@clark.net
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