My only experience with scale is on Gardenias. They always come from the nurseries infected, which doesn’t show up for a few months. I am on my second potted gardenia on my patio and resorted to a systematic insecticide to get rid of it after a year of organic methods such as horticultural oil, spinosad and some other one I am forgetting. The scale is so resistant that I needed a year of monthly systemic treatment in the soil to get rid of it for both plants. Once it is gone it doesn’t come back, since they are on my covered patio and separate from any other plants. Otherwise scale is kinda everywhere on the citrus trees in peoples yards in So Cal.

You're going to have great difficulty eliminating that Scale without employing a systemic insecticide. I've found Talstar Pro to be very effective, or Imidacloprid will work also. There's always something like Dimethoate (an organophosphate insecticide) which will be very VERY effective, but its an older type of insecticide and one of the more toxic varieties. I use it only when there are no other options.

Paul Barden I tried the Inudacloprid as a drench a few weeks ago and it did not appear to work,,,,, The roses seem to be worse....

Do you know where I could purchase Dimethoate, when I do a google search it brings up all kinds of insecticides but when I click on them they have something else as the active ingriedient. The only one I could find was Cygon that listed Dimethoate as the active ingredient but I can't find it to purchase it.....

Thank you for your help.

Sharon