Disregard my previous post -- apparently Mark was right, and I was wrong!
According to
http://www.omegachemistries.com/pdf%...20Dioxide.pdf, the two
are the same compound -- and Hydrogen Peroxide is a lot easier on the
skin, etc. if you spill it.

Just don't complain to us when all your roses starting looking like "blonde
floozies"

Anne Lurie
Raleigh, NC





"Mark. Gooley" wrote in message
...
I saw some product sold as a sort of horticultural disinfectant,
with a mention that it could be sprayed on roses with black spot
as it would kill any live spores on contact. It turned out that it
was "hydrogen dioxide" at a concentration of 27% or so.

Now, as far as I know, that's a synonym for hydrogen peroxide,
and the drugstore stuff can be as cheap as $1 a quart for the usual
3% solution -- about a tenth as strong. So suppose that one put a
pint or quart of the cheap stuff for each gallon capacity of a sprayer,
and diluted it. Spraying it on any live black spot spores (and one
would hope, various other fungal spores, and perhaps some fungal
infestations) would kill them, presumably. Now, it's not a sure cure,
it's not a long-term preventive, but it's certainly cheap and it's
certainly
not toxic. Anyone tried it? Any thoughts?

(After a couple rainy weeks last month, almost every rose I have has
shown SOME black spot, and some have nearly been defoliated. I've
been alternating Daconil and Funginex sprays on a weekly basis. Also,
some of the rugosae have something that looks like rust.)

Mark., north Florida, zone 8b