Spittle bug larvae, like aphids, suck the sap of many garden plants. They protect themselves from dehydration and predators below an excreted spittle like foam.
Spittle bugs rarely do a lot of harm to the plants they feed on but they can cause yellowing and wilting when in large numbers and they do transmit some plant diseases. The spittle like foam can also be unsightly on garden plants.
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