Cuckoo spit
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Thistle_with_cuckoo_spit.jpeg
Thistle_with_cuckoo_spit.jpeg
Cuckoo-spit is a frothy secretion found on plants. It is produced by the immature nymphal stage of various plant-lice of the familiar Cercopidae and Jassidae, belonging to the homopterous division of the Hemiptera. In the adult condition these are sometimes called froghoppers.