AP Photo/Lynne Sladky
In this Wednesday, July 31, 2014 photo, scientist Calum Russell loads bacteria from different insects into a vial which will put into an Asian Citrus Psyllid to see if certain strains of bacteria will protect the psyllid, at the University of Florida Citrus Research and Education Center, in Lake Alfred, Fla. Some of the world's top researchers are working at this center to unlock the puzzle of citrus greening caused by the psyllid. The invasive bug carries bacteria that are left behind when the psyllid feeds on a citrus tree's leaves.
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