The Increase in Resistance in Insects to Insecticides

Abstract

A review of 7 spp. of insects for which exptl.'' evidence has been previously published supporting the proposition that these insects have increased their normal resistance to insecticides. These spp. represent 4 orders of insects of widely different food habits, which have shown an increase in resistance to insecticides representing contact- and stomach-poison sprays, fumigants, a bait spray, and where the insecticide is incorporated in the medium in which the insect lives. Examples of a few other insects and mites are mentioned, where circumstantial evidence tends to support the same proposition.