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Evidence is presented that the effect on aphids of various chemicals applied to plants, e.g. water, N and K fertilisers, chlormequat chloride, and the amino acid antagonist 1‐amino‐2‐nitrocyclopentane‐1‐carboxylic acid, is dependent on a common nutritional mechanism. The value of content of soluble nitrogen compounds in a plant as an indicator of suitability for attack by aphids is demonstrated. Plant resistance as an added restraint contributing to integrated pest control is discussed.
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