Topics considered here include the need for high purity [e.g., hexachlorocyclohexane and polychloroborane isomers and
2,4,5-trichlorophenoxyacetic acid (2,4,5-T)], environmental degradation and the bioactivity of resulting photoproducts and metabolites, pesticide photochemistry (including the use of structural optimization, photostabilizers, and photosensitizers to achieve suitable persistence), the presence of multiple active ingredients in botanical insecticides, the need to consider compounds with common mechanisms of action, issues related to primary and secondary targets, and chemically induced or genetically modified changes in plant biochemistry.
The phenoxyacetic acids 2,4-dichlorophenoxyacetic acid (2,4-D) and
2,4,5-trichlorophenoxyacetic acid (2,4,5-T) constituted Hormoslyr (Gullvik, Sweden), one of the most widely used pesticides in Sweden during that period.
