Hello Terry, You could try spraying the under leafs with a weak vinegar water solution or other weak acidic solution (lemon juice or phosphoric acid and water). I imagine you would have to spray at regular intervals. Spraying the sap off before the mildew forms would be preventative.
Mark Sullivan _______________________________________________ the OrchidGuide Digest (OGD) [email protected] http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
