I follow the directions for 'ornamentals'. I understand broughtonias &
their intergenerics can have black leaf spots or blacken leaf margins from
malathione use. No scientific evidence for that, just an opinion from an
old grower I know.

K Barrett

"jadel" wrote in message
oups.com...
How much 50% malathion per gal. of water is needed to treat for scale
and other nasties on orchids? The directions on the malathion package
are not specific about orchids, referring only to "ornamentals." I
think 2 teaspoons per gallon is what I want, but I am not sure.

Are there any orchid genera which will be harmed by malathion?


J. Del Col