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Contact

College of Agricultural & Life Sciences

Physical Address:
E. J. Iddings Agricultural Science Laboratory
606 S Rayburn St

Mailing Address:
875 Perimeter Drive MS 2331
Moscow, ID 83844-2331

Phone: 208-885-6681

Fax: 208-885-6654

Email: ag@uidaho.edu

Web: uidaho.edu/cals/potatoes

Location

Mailing Address:
1693 S 2700 W
Aberdeen, ID 83210

Phone: 208-397-4181

Fax: 208-397-4311

Web: uidaho.edu/cals/aberdeen

Location

Mailing Address:
3793 North 3600 East
Kimberly ID 83341-5076

Phone: 208-423-4691

Fax: 208-423-6699

Web: uidaho.edu/cals/kimberly

Location

Mailing Address:
29603 U of I Lane
Parma, ID 83660-6699

Phone: 208-722-6701

Fax: 208-722-6708

Web: uidaho.edu/cals/parma

Location

News, updates & conferences

Idaho Potato Conference

Jan. 18-20, 2022 (Mountain Time)

View 2021 Presentations

Seed Potato Germplasm Program

We maintain and distribute disease free germplasm and mini-tubers for domestic and international seed potato growers and researchers.

View Site

Idaho AgBiz Publications

Learn more about the cost of potato production.

learn more

Ag Talk Tuesday

May-August | First & third Tuesday | 11 a.m. to 1 p.m. Mountain Time

view schedule and register today

Pacific Northwest Pest Alert Network

Receive updates on current pest infestations on specific crops.

Learn more

Publications

Visit the College of Agricultural and Life Sciences and University of Idaho Extension publishing catalog for potato related publications.

Sept. 17, 2021

This is the final report of the 2021 Idaho psyllid monitoring program.

From our samples from last week, we found our first Lso-positive psyllid of the season, on a site in Owyhee County. All other psyllids tested from last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). The total percent positive among all sites for the season was 0.08%, which is the lowest incidence of Lso we have observed during the past decade.

During mid- to late July, it appeared that overall psyllid captures would be relatively high this year; however, captures were lower during August, which is the time of year that our psyllid captures are often highest. It is possible that the high temperatures during June to July contributed to higher captures and the more moderate temperatures in August contributed to more modest captures. In the end, overall captures across the season were relatively modest compared to other seasons, and similar to overall captures last year.

Greater abundance of psyllids earlier during the season should generally contribute to greater risk of ZC disease development over the season. However, risk of ZC is a function of both psyllid abundance over the season and Lso incidence. The extremely low incidence of Lso observed in psyllids coupled with relatively modest captures overall, suggests relatively low risk of ZC in the crop this season.

To dive more deeply into the capture data over the season, you can view contour maps that illustrate relative psyllid abundance across the landscape each week at https://potatoes.decisionaid.systems/.


Sept. 9, 2021

This week we had traps deployed in 53 fields, though we are still waiting for traps from one Treasure Valley field and 8 eastern Idaho fields. We found a total of 66 psyllids across 15 (34%) of the 44 fields for which we have data. With many fields undergoing vine kill, this is our last week of retrieving sticky traps. We will, however, report on Lso results and a season recap next week.

Overall psyllid captures this week were similar to the last two weeks, with considerably lower captures than for most recent weeks. We recorded moderate captures in parts of the Treasure Valley and Owyhee to Elmore counties as well as near Twin Falls. We recorded low captures elsewhere.

Psyllids were captured in the following counties: Canyon (three fields), Owyhee (three fields), Elmore (one field), Twin Falls (five fields), Minidoka (two fields) and Cassia (one field).

All psyllids tested from last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). Testing of late-arriving psyllids from one field in Canyon County is pending. Thus far, all of our psyllid samples have been negative.

With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs.


Sept. 2, 2021

This week we had traps deployed in 58 fields, though we are still waiting for traps from one Treasure Valley field. We found a total of 72 psyllids across 13 (23%) of the 57 fields for which we have data. Many fields have undergone vine kill and will no longer be sampled.

Overall psyllid captures this week and last week have been considerably lower than for recent weeks. Contour maps (see links below) graphically reflect relatively high abundance of psyllids collected in Elmore County. We recorded moderate to low captures in other parts of the state and zero captures in eastern Idaho.

Psyllids were captured in the following counties: Canyon (3 fields), Owyhee (3 fields), Elmore (2 fields), Gooding (1 field), and Twin Falls (4 fields).

All psyllids from last week tested negative for Lso, the bacterium associated with zebra chip disease (ZC). Thus far, all of our psyllid samples have been negative.

With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs.


Aug. 26, 2021

This week we had traps deployed in all 73 fields, though we are still waiting for traps from two fields in eastern Idaho. We found a total of 64 psyllids across 22 (31%) fields.

Overall psyllid captures were considerably lower than for recent weeks. Contour maps (see links below) graphically reflect relatively high abundance of psyllids collected in some fields in the western Treasure Valley and in Elmore County, but this abundance is markedly lower than in previous weeks. Moderate to low captures were recorded in the Magic Valley and very few captures were recorded east of the Magic Valley.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (9 fields), Payette (1 field), Owyhee (2 fields), Elmore (2 fields), Twin Falls (6 fields), Cassia (1 field), and Bingham (1 field).

Once again, all psyllids tested from last week were negative for Lso, though testing of a single psyllid from last week is still pending. We have yet to find any Lso-positive psyllids this season.

With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs about two weeks before vine kill. Please consider this in your late-season IPM programs.

To view contour maps in more detail, set up a free account here: https://potatoes.decisionaid.systems/.


Aug. 19, 2021

This week we had traps deployed in all 73 fields, though we are still waiting for traps from one field. We found a total of 115 psyllids across 25 (35%) fields.

Overall psyllid captures were slightly lower than last week. Contour maps (see links below) still graphically reflect relatively high abundance of psyllids collected in some fields in the western Treasure Valley. The Elmore County “hot spot” is slightly diminished. Moderate to low captures were recorded in the Magic Valley. We captured two psyllids in Cassia County, but recorded no psyllid captures further east.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (7 fields), Payette (1 field), Gem (1 field), Owyhee (2 fields), Elmore (2 fields), Gooding (1 field), Jerome (2 fields), Twin Falls (7 fields), Cassia (2 fields), and Power (1 field).

Once again, all psyllids tested from last week were negative for Lso, though tests of psyllids from six fields in the western Treasure Valley that arrived late to us last week are still pending. We have yet to find any Lso-positive psyllids this season.

Nevertheless, we urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place.

To view contour maps in more detail, set up a free account here: https://potatoes.decisionaid.systems/.


Aug. 12, 2021

This week we had traps deployed in all 73 fields. We found a total of 131 psyllids across 25 (34%) fields.

Overall psyllid captures were a bit higher than last week. Contour maps (see links below) still graphically reflect relatively high abundance of psyllids collected in some fields in Elmore County (though slightly lower than in recent weeks) and the western Treasure Valley, but a small “hot spot” is also developing near Twin Falls. Otherwise, modest captures were recorded elsewhere in the Magic Valley, and we continue to see very few psyllids in the Upper Snake region.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (7 fields), Payette (1 field), Owyhee (3 fields), Elmore (2 fields), Gooding (1 field), Jerome (2 fields), Twin Falls (7 fields), Cassia (1 field), and Power (1 field).

Once again, all psyllids tested from last week were negative for Lso. We have yet to find any Lso-positive psyllids this season.

Nevertheless, we urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place.

Contour maps or “heat maps” are included on the UI website (see link below). These maps describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed in collaboration with colleagues at Washington State University from our many years of data on psyllids in Idaho. We include just a screenshot of the contour maps on our site, so we encourage stakeholders to visit the Decision Aid Systems site and create a free account to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/.


Aug. 5, 2021

This week we had traps deployed in all 73 fields monitored this year. We found a total of 94 psyllids across 30 (42%) of the 73 fields.

Overall psyllid captures declined again from last week. Contour maps (see links below) still graphically reflect relatively high abundance of psyllids collected in some fields in Elmore County and the western Treasure Valley, but at least in the Treasure Valley tend to show more moderate incidence of psyllids than last week. Modest captures were recorded in the Magic Valley, and we continue to see very few psyllids in the Upper Snake region.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (9 fields), Owyhee (3 fields), Elmore (2 fields), Gem (1 field), Gooding (2 fields), Jerome (4 fields), Twin Falls (6 fields), Cassia (1 field), Minidoka (1 field), and Bingham (1 field).

All of the psyllids tested from last week and all previous weeks have been negative for Lso.

Nevertheless, we urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place.

Contour maps or “heat maps” are included on the UI website (see link below). These maps describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed in collaboration with colleagues at Washington State University from our many years of data on psyllids in Idaho. We include just a screenshot of the contour maps on our site, so we encourage stakeholders to visit the Decision Aid Systems site and create a free account to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/.


July 29, 2021

This week we had traps deployed in all 73 fields monitored this year. We found a total of 126 psyllids across 36 (49%) of the 73 fields.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (11 fields), Owyhee (2 fields), Elmore (2 fields), Payette (1 field), Gem (1 field), Gooding (2 fields), Jerome (4 fields), Twin Falls (6 fields), Cassia (2 fields), Minidoka (3 field), and Power (2 fields).

Psyllid captures overall declined a bit from last week. Contour maps (see links below) still graphically reflect relatively high abundance of psyllids collected in some fields in the western Treasure Valley and Elmore County, but both areas show more moderate incidence of psyllids than last week. Moderate captures were recorded in the Magic Valley, and we continue to see very few psyllids in the Upper Snake region.

All of the psyllids tested from previous weeks have been negative for Lso.

We urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place.

Contour maps or “heat maps” are included on the UI website (see link below). These maps describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed in collaboration with colleagues at Washington State University from our many years of data on psyllids in Idaho. We include just a screenshot of the contour maps on our site, so we encourage stakeholders to visit the Decision Aid Systems site and create a free account to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/


July 22, 2021

This week we had traps deployed in all 73 fields monitored this year. We found a total of 191 psyllids across 31 (42%) of the 73 fields.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (11 fields), Owyhee (3 fields), Elmore (2 fields), Payette (1 field), Gem (1 field), Gooding (1 field), Jerome (3 fields), Twin Falls (7 fields), Minidoka (1 field), and Power (1 field).

All of the psyllids tested from previous weeks have been negative for Lso, though we are waiting for results from 32 psyllids from six fields that arrived to us late. We continue to have issues with shipping times being slower than in previous years.

Psyllid captures overall ticked up slightly from last week. Contour maps (see links below) graphically reflect the relatively high abundance of psyllids collected in some fields in the western Treasure Valley during the past three weeks, as well as a “hot spot” that has been growing each week in Elmore County. A small area west of Twin Falls showed relatively high captures this week as well. Very few psyllids have been detected in the Upper Snake region thus far.

We urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place.

Contour maps or “heat maps” are included on the UI website (see link below). These maps describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed in collaboration with colleagues at Washington State University from our many years of data on psyllids in Idaho. We include just a screenshot of the contour maps on our site, so we encourage stakeholders to visit the Decision Aid Systems site and create a free account to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/


July 15, 2021

This week we had traps deployed in all 76 fields monitored this year (though we are waiting to receive traps from 11 sites). We found a total of 108 psyllids across 24 (33%) of the 73 fields for which we have data.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (12 fields), Owyhee (two fields), Elmore (two fields), Gooding (one field), Jerome (two fields), Twin Falls (five fields) and Bingham (one field).

All of the psyllids tested from previous weeks have been negative for Lso, though we are waiting for results from two individual psyllids from two fields from last week (the other psyllids tested from those fields were negative).

Psyllid captures overall are similar to last week, though slightly lower captures were recorded in some of the Treasure Valley fields that had the most captures last week. We urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place.

Contour maps or “heat maps” of this week’s and the previous week’s results are included on the U of I website (see link below). These maps describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed in collaboration with colleagues at Washington State University from our many years of data on psyllids in Idaho. The maps graphically reflect the relatively high abundance of psyllids collected in some fields in the western Treasure Valley during the past two weeks, as well as a “hot spot” in Elmore County. Abundance of psyllids remains moderate to low in the Magic Valley and very few psyllids have been detected in the Upper Snake region.

We include just a screenshot of the contour maps on our site, so we encourage stakeholders to visit the Decision Aid Systems site and create a free account to view these and other data in more detail: https://potatoes.decisionaid.systems/.


July 8, 2021

This week we had traps deployed in 73 of the 76 fields (96%) monitored this year and we found a total of 139 psyllids across 30 (41%) of the 73 fields. We are waiting to receive cards from nine more sites.

Psyllids were collected on sticky traps in potato in the following counties: Payette (one field), Canyon (12 fields), Gem (one field), Owyhee (three fields), Elmore (two fields), Gooding (one field), Jerome (two fields), Twin Falls (five fields), Minidoka (two fields) and Power (one field).

Lso results are still pending due to shipping delays, but results will be posted here once results are in.

Thus far, psyllid captures are tending to be a bit higher than they were at this time the last two years. We urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place.


Contact

College of Agricultural & Life Sciences

Physical Address:
E. J. Iddings Agricultural Science Laboratory
606 S Rayburn St

Mailing Address:
875 Perimeter Drive MS 2331
Moscow, ID 83844-2331

Phone: 208-885-6681

Fax: 208-885-6654

Email: ag@uidaho.edu

Web: uidaho.edu/cals/potatoes

Location

Mailing Address:
1693 S 2700 W
Aberdeen, ID 83210

Phone: 208-397-4181

Fax: 208-397-4311

Web: uidaho.edu/cals/aberdeen

Location

Mailing Address:
3793 North 3600 East
Kimberly ID 83341-5076

Phone: 208-423-4691

Fax: 208-423-6699

Web: uidaho.edu/cals/kimberly

Location

Mailing Address:
29603 U of I Lane
Parma, ID 83660-6699

Phone: 208-722-6701

Fax: 208-722-6708

Web: uidaho.edu/cals/parma

Location