Insecticidal activity of the pyrethrins and related compounds VIII. Relation of polarity with activity in pyrethroids

Comparing insecticidal activities of a wide range of pyrethroids with polarities measured by reversed phase, thin‐layer chromatography suggests that there are optimum polarities for potency in both Musca domestica and Phaedon cochleariae, and that these optima have closely similar values. The significance of these conclusions is discussed.