Citrus mussel scales are a type of insect that can cause significant damage to citrus trees. Some other synonyms for citrus mussel scale include red scale, California red scale, and Aonidiella aurantii. These insects are known for their hard shells, which can make them difficult to control with traditional insecticides. However, there are some effective natural and chemical treatments that can help to get rid of citrus mussel scales. If left untreated, these scales can weaken and eventually kill citrus trees, so it's important to keep an eye out for signs of infestation and take action as soon as possible if you notice any symptoms.