Thanks for the ideas about Listerine and hydrogen peroxide. I'm a firm believer in avoiding nasty chemicals because of my 2 cats who are indoors, and the birds who visit the backyard outdoors.
When using cinnamon the liquid extract is more effective and easer to use than the powder.
Worm Tea. leachate from a worm bed not the castings, is a natural pesticide and effective against all insects. Totally harmless to humans and pets.
A pair of scissors is still the best home remedy against Phythium fungus (black rot). Cut off the infected area before it spreads into the pseudobulbs.
When using most liquid solutions a few drops of dish soap as a wetting agent allows the solution to spread more easily over the plant.