That should work. My shrubs had horrible scale. It was here when we moved in . And the freaking ants! Everywhere, farming them. I had to bust out the Bayer and drench it. I hated to do it but it was just too far gone. It worked really quickly and the plants are recovering.

I hate using chemicals, but tea scale is the worst. It can kill mature bushes, so you really don't have much choice. The other organic treatment is to spray them with dormant oil (a lighter oil that won't hurt the plants) every ten days until the scales are gone. I'm going to have to go nuclear on my Confederate Rose next year. Luckily, it will die back this winter and come back out, but the whiteflies are just too much. I was hoping for blooms, but no matter what I've done, they are just unbeatable. Next year for sure, it's Bayer, although I really, really hate to do it, but I love that plant.

Brew a pot of coffee and once it cools down, spray that on scales. They will die on contact. Tea scale is a lot easier to get rid of than Asian cycad scale

If I see it happen again I'll try this, thanks.