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Final potato psyllid monitoring update of 2025 season
Potato All Locations
potato psyllid
Posted on: September 19, 2025 by Tasha Stanzak
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
Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/
Psyllid captures decline overall, one new Lso-positive – 11 September 2025 update
Potato All Locations
Posted on: September 11, 2025 by Tasha Stanzak
• This week we received traps from 21 fields that we are monitoring. Most fields have undergone vine kill and/or monitoring on them has otherwise ceased.
• We captured a total of 11 psyllids across 3 fields.
• Captures were from Canyon and Twin Falls counties.
• Among the 17 psyllids captured last week, one tested positive for Lso.
This is our last week reporting psyllid captures. Next week we will report on Lso incidence in psyllids captured this week. Psyllid captures from this week were relatively low overall. One of the psyllids from last week tested positive for Lso; this was the first Lso-positive psyllid since early August. Lso incidence this year has been relatively high, but thankfully the relatively low abundance of psyllids should mitigate risk of ZC somewhat. Nevertheless, we encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids earlier this season. Next week we will post an end-of-season wrap up.
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
Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/
Psyllid captures still moderate, no new Lso – 4 September 2025 update
Potato All Locations
potato psyllid
Posted on: September 4, 2025 by Erik Wenninger
• This week we received traps from 17 fields that we are monitoring. Many fields have undergone vine kill and/or monitoring on them has otherwise ceased.
• We captured a total of 17 psyllids across 6 fields.
• Captures were from Gooding, Jerome, and Twin Falls counties.
• Among the 43 psyllids captured last week, none tested positive for Lso.
Psyllid captures were on par with the low-to-moderate numbers that we saw during the past few years at this time. Thankfully all the psyllids from last week again tested negative for Lso; we haven’t had any Lso-positive psyllids since early August. This should have been the last week of reporting on psyllid captures, but the busy season delayed retrieval of traps from some fields, so we hope to have those numbers next week. In the meantime, we encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids this season.
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
Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/
