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Honeydew is a sweet, sticky substance secreted by certain insects, primarily aphids and scale insects. These insects feed on plant sap, which is rich in water and sugars. To extract enough nutrients, they must ingest large quantities of sap. Their digestive system concentrates the nutrients, and the excess water, along with some sugar and waste materials, is excreted from the rectum.12

This sugary excretion, honeydew, serves as a food source for other insects, such as ants, which are attracted to its sweetness. Ants often protect and care for the aphids that produce honeydew, a relationship where ants "milk" the aphids for their sweet secretion. In some cases, specialized ants, known as honey ants, store honeydew in the abdomens of certain worker ants called repletes, which can then regurgitate it to feed the colony. Honeydew can also support the growth of a dark fungus called sooty mold on plants.2345

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