What method do oils primarily use to control mosquito larvae?

The method by which oils primarily control mosquito larvae is through suffocation and drowning. When oils are applied to water surfaces where mosquito larvae reside, they create a thin film that spreads on the surface. This film interferes with the larvae's ability to access the air they need to breathe. As a result, the larvae are unable to acquire oxygen and ultimately suffocate.

In addition to suffocating the larvae, the oil can also lead to drowning because it makes it difficult for them to navigate through the water. Mosquito larvae typically hang at the water surface to breathe, and with the oil film present, their movement is impeded, leading to their demise.

This method is generally effective because it targets the physical aspects of the larvae’s environment without relying on chemical reactions or hormonal changes within their biology.