Larvicide
[1][2] Bti and B. sphaericus are both naturally occurring soil bacterium registered as larvicides under the names Bactivec, Bacticide, Aquabac, Teknar, Vectobac, LarvX, and VectoLex CG.When the mosquito larvae ingest the bacteria, crystallized toxins are produced that destroy the digestive tract, resulting in death.Due to the small amount needed and the fast rate that temephos breaks down in water, this type of larvicide does not pose an unreasonable health risk to humans, but at large doses it can cause nausea or dizziness.[citation needed] Copper is also known for its larvicidal properties, and has been tested in field settings to determine its effectiveness and practicality for mosquito control.Median lethal concentration (LC50) of the formulation against Anopheles stephensi, Culex quinquefasciatus and Aedes aegypti was found to be 1.6, 1.8 and 1.7 ppm respectively.