The organic phosphorus compounds hexaethyl tetraphosphate (HETP) and tetraethyl pyrophosphate (TEPP) are the active components of certain commercial insecticide formulations and have been shown to be toxic, at relatively low concentrations, to a rather wide array of organisms (Hall, 1950; Hall and Jacobson, 1948a: Hall, 1951; Harris, 1947; McIlrath, 1950; Smith et. al., 1948a and l 948b). From their work on the chemical and insecticidal properties of these compounds, Hall and Jacobson (1948a, 1948b) concluded that the so-called HETP is not a specific compound but actually a mixture of esters owing its biological potency to the TEPP that it contains. However, in a later publication, Hall (1950) implied that HETP contained other undetermined substances toxic to insects in addition to TEPP. After studying the hormone-like effects of these compounds upon plants both McIlrath (1950) and Hall (1950, 1951) suggested that degradation products of HETP and TEPP might also be one of the possible factors instrumental in eliciting the formative responses noted.
Proceedings of the Iowa Academy of Science
©1951 Iowa Academy of Science, Inc.
Hall, Wayne C.
"The Relationship of TEPP and Photoperiod to Flowering and Fruiting in Tomato,"
Proceedings of the Iowa Academy of Science, 58(1), 133-138.
Available at: https://scholarworks.uni.edu/pias/vol58/iss1/12