Hi Suze,
Yes, so far, so good. I have had some of them nest in the undersides of the leaves, but the Take Down seems to freeze them in their tracks. You may be able to find it in a local Nursery store, which is where I found it. About the same price - but you save shipping, and you have it to use immediately. My plants are doing well. Here is a photo of a pair of Siberia taken last week:
Just hope we continue to get mild weather for another few months. Supposed to hit 100 degrees here over the weekend. This is actually our warm Season, as you may remember the Oakland Fire of several years ago that burned 500 homes. That hit the last week of September.
Raybo