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Final psyllid monitoring update of 2026 season
Potato All Locations
potato psyllid
Posted on: September 17, 2026 by Erik Wenninger
This is the final report of the 2026 potato psyllid / Lso monitoring season.
Last week we provided a season wrap up, but we did not yet have the final results of Lso testing of the most recently captured potato psyllids. Thankfully, only 3 more psyllids tested positive: 2 from a site in Elmore County and 1 from a site in Twin Falls County. The overall percent incidence of Lso in psyllids collected this season landed at just under 3%.
The following is a summary of last week’s wrap up: The risk of ZC may have been moderately elevated by the relatively high number of psyllids captured, but mitigated a bit by the relatively low prevalence of Lso in psyllids. The percentage of psyllids with Lso was lower this year then for each of the previous four years.
It is worth noting that several sites in Canyon County, and a few in Elmore and Twin Falls counties, accounted for much of the abundance of psyllids as well as the “hot” psyllids that we captured. So risk of ZC has not been uniform across the state. As is typical, we saw few psyllids in the Upper Snake region, and none of them tested positive for Lso.
For any growers that have not vine killed yet, we urge you to keep your IPM programs going, especially for areas that are at slightly higher risk.
A huge thank you to all 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! We could not do this work without your help.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/extension/food/ipm/ag-pests/psyllids
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 the current week and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org
» https://idahopestmonitoring.org
» https://tinyurl.com/potatopsyllid
» https://www.uidaho.edu/extension/food/ipm/ag-pests/psyllids
September 11, 2026 – Season wrap up, part 1
Potato All Locations
potato psyllid
Posted on: September 11, 2026 by Erik Wenninger
Last week we reported on our last trapping week of the season. We had hoped to have Lso test results by today for psyllids captured last week; unfortunately delays in shipping inhibited our ability to do so, but we expect to have those results next week. However, we can still summarize what we’ve reported on this season.
Overall captures were relatively high this season, with captures similar to the most recent “high water mark” of 2020 and 2021. Captures during the last two weeks were notably even higher than for the same time period during those two previous years. So far the overall percent incidence of Lso in psyllids is around 3%.
The risk of ZC may have been moderately elevated by the relatively high number of psyllids captured, but mitigated a bit by the relatively low prevalence of Lso in psyllids. The percentage of psyllids with Lso was lower this year then during each of the previous four years.
It is worth noting that several sites in Canyon County, and a few in Elmore, and Twin Falls counties, account for much of the abundance of psyllids as well as the “hot” psyllids that we’ve been capturing. So risk of ZC is not uniform across the state. As is typical, we saw few psyllids in the Upper Snake region, and none of them tested positive for Lso so far.
For any growers that have not vine killed yet, we urge you to keep your IPM programs going, especially for areas that might be at slightly higher risk.
Next week, we’ll report on the last batch of psyllids undergoing Lso testing.
» https://www.uidaho.edu/extension/food/ipm/ag-pests/psyllids
