The most effective methods of mosquito control are to eliminate stagnant water where larvae can develop and applying larvicide to targeted locations. After determining that standing water is contaminated with mosquito larvae, staff uses Bacillus thuringiensis (Bti) and/or Bacillus sphaericus (Bsp) to inhibit development. Bti and Bsp are, commonly applied with ground corn or a silica-based granule that are ingested by the larvae. When that happens, the bacteria that eat away the stomach and intestines of the larvae, killing them before they further develop into pupae and adults. Although very effective on the mosquito larvae, this process causes no harm to people or other mammals, and is non-toxic to all aquatic organisms.