Las Vegas Sun

September 23, 2014

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In this Wednesday, July 31, 2014 photo, horticulture professor Fred Gmitter holds root stock of a citrus tree at the University of Florida Citrus Research and Education Center, in Lake Alfred, Fla. Gmitter is studying the citrus greening disease and has discovered that a certain variety of orange trees grafted onto one kind of rootstock appear to be more tolerant to greening. Greening is caused by an invasive bug called the Asian Citrus Psyllid, which carries bacteria that are left behind when the psyllid feeds on a citrus tree's leaves.

AP Photo/Lynne Sladky

In this Wednesday, July 31, 2014 photo, horticulture professor Fred Gmitter holds root stock of a citrus tree at the University of Florida Citrus Research and Education Center, in Lake Alfred, Fla. Gmitter is studying the citrus greening disease and has discovered that a certain variety of orange trees grafted onto one kind of rootstock appear to be more tolerant to greening. Greening is caused by an invasive bug called the Asian Citrus Psyllid, which carries bacteria that are left behind when the psyllid feeds on a citrus tree's leaves.