You can also use 2 very safe products that should be in your garden center. Usually they have one of these. Safer-soap or horticultural oil. I had scales on my houseplant orchids and used the soap. It took a few treatments, but they seem to finally be gone. OH yeah, they WILL kill your plant if you don't get rid of them. They got one of my orchids, but since they were on the underside of the leaf it was too late by the time I noticed them.