Termites do not normally attack live, healthy trees so you most likely will not find any products that will work as a ground barrier around the trees. Most people are primarily concerned with protecting the big investment, their home, and Termidor SCwould be the product to use for that. It is only labeled to be used adjacent to the structure though. Please take a moment to read over our article on "How to do a Termite Treatment" for complete details.
Termidor SC cannot be used to treat fire ants or their mounds. We recommend that you treat the individual mounds (as well as a broadcast) with Extinguish Plus Fire Ant Bait. It will take approximately 1.5-2 lbs per acre and 2-5 TBSP per mound. Please see our Fire Ant Pest Guide for more information and tips about treating for this pest.
Termites do not attack live, healthy trees. If the tree has been damaged by termites it would be advisable to remove the tree and perform a liquid termite soil treatment with Termidor SC to ensure subterranean termites to not find a food source inside of your home. Please take a few minutes to read our article How to Perform a Termite Treatment which will explain how to do the treatment in laymens terms and also explain any needed equipment. Most folks find that they only need a 5 gallon bucket and perhaps a drill in some situations. You should follow the Termidor product label and you should mix Termidor with water as specified. No special equipment is needed to diltute Termidor because it is a water based product and readily mixes with water.
Spraying Termidor SC on the surface of soil is not going to offer a protective barrier like the trench and will only work for the general pests that contact the soil surface. Termidor binds to the soil that it is applied to and needs to be used in a trench 6 x 6 inches to offer the best protection. It also does not move through the soil after rain. Termites do not actually contact the surface so it would be best to go back and complete the trench in those areas that have not been done.
Termidor SC is applied as a spray once every six weeks topically up against the foundation for insects that crawl on top of the soil, such as ants. If you are trying to treat for subterranean termites, you will want to dig a trench up against the structure, and if there is concrete up against the foundation you will need to drill to apply the product. Please take a few moments to review our article on How to Get Rid of Subterranean Termites for specific application instructions.