Zerotol is a broad-spectrum algaecide/fungicide that is labeled for plant
use (as compared to being labeled for use on hard surfaces). It has a zero
hour REI and requires no respirator. It is available from most of the
grower supply companies. The smallest size I have seen it sold in is a two
and a half gallon jug which sells for more than $100. It is my
understanding that its chemistry differs from Hydrogen Peroxide by one
oxygen. Many smaller growers use Hydrogen Peroxide in the same way Zerotol
is used. Maybe someone in the group has experience using Peroxide. I am
not sure this helps but Zerotol is 27% and is used at .5 to 1.25 oz per
gallon. Household Peroxide is 3%. If you do not get any better suggestions
you might want to try 10 ozs peroxide per gallon of water and see if this
clear up the wood without killing the plant. I would only test it on one
plant and if I had an old basket with the mold and not a plant I would try
that first to make sure it will even help.

Pat

"cvandyke" wrote in message
]...
I want to remove the black deposits on the wood baskets in which my Vanda
orchids are growing. Mostly for aesthetics, but I don't want to tear the
plants apart and put them in new baskets. Someone from the AOS mentioned a
product called "xeratrol" or something like that (not sure of the
spelling -could be something related to a peroxide). Does anyone know what
this chemical is and where to get it - or another solution to the problem?

Thanks

Charles VanDyke