I use a copper based fungicide called Phyton 27 on a wide range of
ornamental plants. I find it provides excellent control of Botrytis and
Bacterial leaf spots, as well as powdery mildews. PLEASE UNDERSTAND THESE
ARE NOT CPs. When I use the label rate I have found no phytotoxicity.
I am curious, because several ephiphytes sp? are mentioned as being
sensitive to copper based fungicides. First Bromeliads mentioned on
another mailing group (HGA-L). Then the mention here of Nepenthes and
in the reply posting Hoya. Does anyone know of a general sensitivity of
to copper in ephiphytes? Phil Soderman sgrower1@rain.org On Thu, 24 Nov
1994, Rogan Roth wrote:
> Dear All,
>
> Copper based fungicides seem to be a no-no for many ornamental
> plants (most?). I tried a similar thing with asclepiads (Hoya
> spp and Dischidia spp) with the same results - they turned a
> peculiar shade of grey, then brown and finally black! It took
> several plants a long time to recover and some never did. Good
> ventilation seems to be the only way to prevent fungal attacks
> without having to use noxious chemicals - this can be
> problematical if you are trying to maintain a high humidity.
>
> Cheers for now
> Rogan Roth.
>