[Bases for control of arthropod vectors: III--Insecticides and questions they raise (author's transl)].

Insecticides are still nowadays our main way of control of arthropod vectors. Their use raises many important question, resistance of the vectors, toxicity, risks of pollution and costs of spraying campaigns. These various drawbacks are considered with special regard to the problem of resistance its world wide spreading, its mechanisms, its meaning. The various types of toxicity are also detailed.