sentences:  Therefore, researchers conducted electrical penetration graph experiments of leaf hoppers in which they wired beet leafhoppers to an EPG machine and characterized the types of waveforms produced.The data showed that beet leafhoppers primarily ingested phloem sap along with xylem and mesophyll sap.What was surprising however was that the rate of phloem ingestion in beet leafhoppers is significantly lower than that in other sap feeding insects.