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Sucrose concentrations in exudate taken from severed aphid stylets. Data are from the literature. Reference citations are as follows: corn (38, 39), barley (40), spinach (41), peach (42), rice (43), wheat (44, 45), lettuce (46), clover (47), and willow (48–52). Data for willow from the Fisher laboratory (48–50) are shown as the mean and range of three studies.
