Spittle bugs are one of the main spreaders for the Xylella Fastidiosa bacteria. When they feed on an infected plant, they then carry it onto the next plant and diffuse the pathogen. Spittlebugs are actually quite common field insects. Here are some interesting facts that you might not know about the Spittlebugs.
Spittlebug Facts
For more information about the Xylella Fastidiosa bacteria, click here.
Sources: John Innes Centre in plant and microbial science, ThoughtCo article by Debbie Hadley, University of California Agriculture & Natural Resources