I found a few gasteria plants with mealy bugs and these plants have had these for a few years. They've been treated several times but every January they begin to show up again. This time I'm keeping them in plastic bags for a week while they are being treated with BotaniGard ES and hopefully this will put an end to the insects for good. I probably won't be able to tell if the bag method works until next January, but this method has worked on several cactus plants that had reoccurring mealy bugs. I soak the soil and coat the leaves with the solution and then put the potted or unpotted plant in a plastic bag for a week in an area with low light.