Red gum lerp psyllid
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This Australian import,
Glycapsis brimblecombei, feeds on eucalyptus foliage and has been devastating redgum and other eucalyptus trees in California, Florida, Hawaii and South America since 1998. Note the tiny adult psyllid on the midvein of the leaf. The white "lerps" that the insect forms serve as shelters for the developing nymphs that live and feed underneath.
Turf Insects