It has generally been supposed that the uptake of large quantities of plant sap by aphids is the direct result of suction. Zweigelt (1914) has questioned this concept, and Kennedy & Mittler (1953) have thrown further doubt on the supposition that aphids are typical ‘sucking’ insects. The present paper sets out results, obtained in a study of the uptake of phloem sap by Tuberolachnus salignus (Gmelin), which may help to clarify this question.

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