Reports of potato psyllids in Idaho potato fields read like a good news-bad news joke.
The bad news is yellow sticky cards in an increasing number of counties have picked up adult psyllids, according to a University of Idaho pest alert.
And some of those psyllids have tested positive for Candidatus liberibacter, the bacterium responsible for zebra chip.
The good news is scouts have yet to find any nymphs or immatures, and they haven't seen any colonization of potato plants by psyllids.
Among the counties where sticky cards, which are part of a University of Idaho sampling network, have caught psyllids are:
Twin Falls County, with some psyllids positive for liberibacter. Zebra chip-infected plants were confirmed at two sites, including the university's Kimberly Research and Extension Center.
Jerome County, psyllids at one site positive for liberibacter.
Minidoka County, some psyllids positive for liberibacter.
In addition, crop consultants or growers have submitted samples that tested positive from Elmore, Canyon and Minidoka counties.
For more information on potato psyllids and zebra chip, visit the University of Idaho's Kimberly Center.