Both copper and sulfur are natural fungicides and can be used on orchids. So can the combination called coppersulfide. Pyrethrins are insecticides derived naturally from chrysanthemum flowers. They act as nerve agents to paralyze the pests. No problem using them on orchids either.
Some news from the OC:
One of my miniphals: Phal. Peter Blue Sky (Phal. Siam Treasure x Phal. pulcherrima)
This is Vaughnara [Vnra.] Fiftieth Anniversary (Bc. Richard Mueller x Epi. magnoliae):
Another one of the little Phals: Phal. Mancervi (Phal. mannii x Phal. cornu-cervi)
Psychopsis Mendenhall alba form
Must run to a nursing home concert, more later.
Jim
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