As far as I know, no (cannot be 100%). The vendor says it was juice from where the leaf was cut or cloning solution. Plant is older now a few weeks, don't see any bugs. However, I freaked at the time, sprayed it down several times with spinosid and pyrethrin. She' never regained her vigor .
I see some brown stuff on the vein there as well as shiny spots. Personally, never been able to reproduce that kinda thing...... that pheno of blueberry extra juicy maybe?