Orange oil can be applied directly to termite-infested areas with a spray bottle or handheld device. It is also available in granules, which can be spread onto the soil and around foundations. The active ingredient in orange oil, d-limonene, works to naturally disrupt the exoskeleton of termites, killing them on contact. Protective equipment such as gloves and breathing masks should always be worn when applying orange oil due to toxicity concerns. It is important to note that orange oil may not penetrate deeply into wood structures unless absorbed via injection or dusting techniques.