What is citrus greening disease?

Citrus greening disease is one of the world’s most serious citrus diseases, with no known cure. Within years, the disease greatly reduces the production of citrus trees and is spread by gnat-sized insects called Asian citrus psyllids.

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In this segment:

John Caravetta, associate director of the plant services division of the Arizona Department of Agriculture

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Ken Burns presents ‘Country Music’

The new documentary premieres Sunday, Sept. 15, through Wednesday, Sept. 18, and Sunday, Sept. 22, through Wednesday, Sept. 25, at 7 p.m. each night

Detective odd couple 'Shakespeare and Hathaway' return

The unlikely detective duo of return to Arizona PBS for a second season beginning Thursday, Sept. 5, at 9 p.m. on Arizona PBS.  This quirky crime drama is packed with corpses, comedy and cracking mysteries.

Season 8 of 'Death in Paradise' brings more quirky island mysteries

On Saturday nights at 8 p.m., Detective Jack Mooney of "Death in Paradise" is really starting to get to know the people and places of Saint Marie – to a degree that surprises some of his colleagues.