Chapter 12. H. F. van Emden. 1978. Insects and secondary plant substances—an alternative viewpoint with special reference to aphids. Pages 309-323. In: J. B. Harborne (editor). Biochemical Aspects of Plant and Animal Coevolution. London, Academic Press, 435 pages.

Keywords: influence of secondary substances on phytophagous insects, insect growth, plant-host selection, phagostimulant and deterrent compounds, influence of secondary substances on predation by carnivorous insects, Brevicoryne brassicae, Diaeretiella rapae, secondary substances and host restriction of insects, the advantages of host restriction, defense against predators, maximization of feeding efficiency, improvement of population regulation, the distribution of host restriction in aphids, stable versus less stable ecosystems, Mysus persicae, polyphagy, host specificity and insect evolution, r and k selection