I have used a Q tip with windex on each that that did it. Also have used other stuff that killed them, but they didn't fall off. You may use Alcohol as well, get them off now, then use a strong spray of water to wipe them clean. Watch for new one to hatch. Keep with it until, you don't see any more. Often when you get a plant like that, they are dead but just not removed. Be sure to also wash your hands so not to spread those babies around. Norma

Thanks for the info. Saw some more a few days after I scraped the 15-20 away, but haven't seen any since. If I don't see any next week, then maybe I got them all. Good to hear that it'll probably be okay... Silver Queen is a beauty. (And my second sans... oh wait, third. Got a hahnii just before it.)

Thanks again!

I glad to be of help, and especially glad to receive a thank you.

I have been using a windex spray bottle, and spraying the plants, they don't seem to mind at all, I have used it on the Haworthia, I don't get scale on Sansevieria, they should not have any pest. Use a QT to try it out first on Sans. I use used alcohol, and Neem oil, I have used soap and water, Ultra Fine is another oil. Do you need any more suggestions. Norma