Potato psyllids trapped in a commecial field in Twin Falls County, Idaho, have tentatively tested positive for Candidatus Liberibacter solanacearum, the bacterium responsible for zebra chip.

Genetic testing conducted by potato virologist Alex Karesev's lab in Moscow are being followed up by a different genetic test to confirm Liberibacter, according to a university udpate.

Additional psyllids collected in late June from this site as well as from the university's Kimberly Research and Extension Center, Kimberly, will be tested for the disease later this week.

Scouting has yet to find the psyllid in any life stage on potato plants in the area.

But the pest has been found in field bindweed along the edge of the field with the "hot" psyllids.

And psyllid eggs have been subsequently found on several bindweed plants.

If these psyllids ultimately are confirmed with Liberibacter, it would be the first report of the disease in the Pacific Northwest this season.