What is the primary purpose of using residual insecticides?

The primary purpose of using residual insecticides is to create a long-lasting toxic barrier. These insecticides are designed to persist on surfaces for an extended period, continuously affecting any pests that come into contact with the treated areas. This long-lasting effect is crucial for controlling pest populations effectively and preventing re-infestation.

By establishing this barrier, residual insecticides help to maintain control over pest activity over time, reducing the need for frequent applications. This is particularly beneficial in situations where pests are known to re-enter an area or where there is a high potential for reinfestation.

While immediate knockdown of pests is important in certain situations, this is generally achieved with contact insecticides rather than residuals. Attracting pests away from structures and enhancing the effects of other pesticides are not the primary purposes associated with residual insecticides and are typically strategies employed in other pest management practices.