Termidor SC can kill sugar ants when used outside around the perimeter of the home but these are not actually a species of ant. It is just what ants that are looking for a sugar/carb based food are called since they go for sweets. We would suggest using either the Indoor or Outdoor Ant kit depending on where you are seeing activity.
Sugar Ant Products/Kits
How to Get Rid of Ants Treatment Guide
No, Demand CS and Termidor can not be used in the same area at the same time. Termidor SC is a non-repellent product that works with a delayed reaction time and a transfer effect. Termidor SC also has a very limited label that only allows you to use it on or immediately adjacent to a structure. Demand CS on the other hand is broadly labeled and will kill the insects that walk over treated surfaces. If you mix the two together you will be losing the non-repellent factor and transfer effect of the Termidor SC and you will be severely limiting the places you can spray the Demand CS. Termidor SC is not labeled to be tank mixed with other products.
Termidor SC is labeled for all types of termites. How you use it is determined by the species of termites you are dealing with. If you have termites in your home, we recommend doing the liquid treatment as outlined in the "How To Do A Termite Treatment" article and then inside the home where you know you have the termites you will treat them directly by injecting the Termidor into the wall or cutting a hole into the wall and spraying on the wood or however you can get the product to the termites. It only needs to touch a few termites to work.
Termidor SC should have no effect on plants that are inadvertently sprayed with the product. It is important to read and follow the Termidor SC product label which states that you can only treat one foot up from and one foot out from where the ground meets the structure. The label also recommends that you remove or prune away plants, shrubs or tree branches that touch the structure. Vegetation that comes into contact with the structure may offer a route of entry for the ants allowing them to enter the structure without ever having come into contact with the treated area.