Black spots / Defender

[Lagoon]

Hi There .... I picked up some safers defender. I can't seem to find some of the other more popular brands for fungus or bacteria. I did ask about a rose fungicide spray, I was told they not longer stock it and it's discontinued.They did have some powder forms but I was uncertain about this and didn't want to risk geting the wrong stuff.
I have some blackish pits on my phal and flat black spots on a Cochleata orchid. Has anyone here had any success with this product and did you use it as instructed on the label??

Thanks for any help