I have been using a product containing harpin proteins that has been a tonic for all orchids in my hobbyist's collection of 600 - 700 plants. Its trade name is "Messenger". Quoting from www.messenger.info, their web site: "The technology is based on a family of naturally occurring proteins called “harpins”. Harpin proteins stimulate natural reactions in plants that enhance disease resistance, growth, and flowering." One 0.25 ounce packet of the product makes a gallon of spray which is enough to treat about 1000 plants. Treated plants live up to the manufacturer's claims. It even arrests Phalaenopsis Crud.
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