Recently I found a new local nursery which had a decent selection of cold-hardy succulents. I bought over a dozen Semps, Rosularias, Orostachys, Sedum, plus an Opuntia, and an Echinocereus. I have since discovered that many of them have root mealies.... Most of these plants will be going in the ground (PIGged as Rosemarie would say), so I am hoping that natural predators will take control the populations on those plants (I will also be removing as much soil as possible prior to planting). However, some of these plants I had planned to plant in a new trough garden I am assembling, where natural predators will not have much effect. I try not to use insecticides or pesticides in my garden. Does anyone have any suggestions on how to get rid of these beasts? I've dealt with regular mealies often ( rubbing alcohol), but have little experience with root mealies. Also, does anyone know how cold-hardy they are, ie. will a winter outside in a shallow trough kill them?
P.S. Returning them is not an option!