Honeydew as a food source for natural enemies: Making the best of a bad meal?

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Recent advances in conservation biological control of arthropods by arthropods (2008, background): “In the first paper of this special issue, Wäckers et al. (2008) review the suitability of this resource as a food source for natural enemies and discuss whether parasitoids of honeydew-producing hosts are better adapted than are other species to utilize honeydew.”
Parasitoid learning: Current knowledge and implications for biological control (2015, background): “of sap-feeding Homoptera (Wäckers et al., 2008), even when they are not hosts.”
Beyond nectar provision: the other resource requirements of parasitoid biological control agents (2016, background): “There have been few studies examining the extent to which honeydew feeding takes place in the field, or the conditions that encourage it, but such a ‘double dependency’ of parasitoids on pest insect species is bound to have implications for biological control (W€ackers et al., 2008).”
The impact of adult diet on parasitoid reproductive performance (2017, background): “Honeydew has not evolved to attract sugar-feeding arthropods and contains plant-derived and aphid-synthesized compounds, which can reduce its nutritional suitability (Wäckers et al. 2008).”