Dithane m-45 how to use

[Zoren]

Dithane m-45 how to use
I bought 2 new Phalaenopsis species: Bellina (1 spike with almost blooming bud with a second bud about to come out and Cornu cervi with I think 6 spikes, I got them from RF Orchids in Homestead Florida. Geo of RF Orchids informed me that the Cornu cervi has a small 'leaf fungus' and sold me Dithane m-45 to be apply it to the plant. The instructions he gave me are 1 tablespoon of powder to 1 gallon of water, to be applied every 10 days for about a month or as long as it takes to get rid of the leaf fungus. I have no experience with this product and the instructions to not very understandable. I also would like to know if I can spray all my orchids even if they don't have a fungus or mold. Is it safe to use the product as a form of protection. Do any senior or any member have any experience with this product. I could use some help from anyone out there!! Zoren...