Final psyllid monitoring update of 2025 season

This is the final report of the 2025 potato psyllid / Lso monitoring season.

Among the 11 psyllids captured last week, two tested positive for Lso, the bacterium associated with zebra chip disease (ZC).

Overall captures have been remarkably similar for the last three years. About 10% of all psyllids tested positive for Lso this year compared to about 4% last year and 6% the year before. The risk of ZC may have been slightly elevated this year by the prevalence of Los, but mitigated somewhat by relatively low psyllid captures. It is worth noting that nearly all of the Lso-positive psyllids were captured in the Magic Valley, with a few in the Treasure Valley, and none in the Upper Snake region.

Please remember that our research with Russet Burbank shows that ZC can develop during storage if infection occurs as late as two weeks before vine kill.

Thanks again to all of our cooperators who helped to deploy and retrieve so very many yellow sticky traps! And thanks to the growers who let us use their fields for this work!

More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid