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Minimizing Foreign Material in Potatoes: Download a printable poster and view on-line educational videos at www.uidaho.edu/cals/potatoes/food-and-farm-safety
All Crops All Locations
Foreign material
Posted on: September 10, 2019 by Nora Olsen
Minimizing Foreign Material in Potatoes:
Download a printable poster and view on-line educational videos at www.uidaho.edu/cals/potatoes/food-and-farm-safety
Foreign material is any material that is not the potato tuber. It is "trash" or "garbage" in potatoes. Many foreign materials originate in the field, but others enter the product stream through equipment and during storage and handling. Whether potatoes are destined for the fresh market or processing, foreign material is a great concern to the Idaho potato industry. By minimizing foreign material in the field, in storage, and in the processing plant, growers and processors help maintain a high-quality product, safe standards, and consumer confidence.
The video “Continuing to Manage Foreign Material for Quality Idaho Potatoes” outlines ways you can reduce foreign material in your potatoes. The video (English and Spanish versions) are available on-line at www.uidaho.edu/cals/potatoes/food-and-farm-safety.
New this year: Remove Foreign Materials poster. Download and print a poster (16" x 24”) that provides examples of common foreign material found in potato production. Display the poster in areas to educate employees and as a reminder to remove foreign material.
Call for Pink Rot
Potato All Locations
Pink Rot (Phytophthora erythroseptica)
Posted on: September 6, 2019 by Jeff Miller
Miller Research has received funding to evaluate the pink rot pathogen (Phytophthora erythroseptica) for sensitivity to mefenoxam and phosphorous acid. If you observe pink rot, please send us samples. It is best to send tubers which are only partially decayed and still have some healthy tissue remaining. It is very difficult, if not impossible, to isolate the organism from completely rotted tubers.
Wrap tubers in dry paper towels and send them as quickly as possible to:
Miller Research
426 E 200 N
Rupert, ID 83350
Please contact Cheryn Clayton by phone (208-531-5124) or email (cheryn@millerresearch.com) to notify us that samples are being sent. If you have any questions, please feel free to contact me at 208-431-4420.
Good luck with harvest!
Jeff Miller
Psyllid update September 5 2019
Potato All Locations
Potato Psyllid
Posted on: September 5, 2019 by Lucy Standley
This week we had traps deployed in 62 of the 79 fields (78.4%) monitored this year, and we found a total of 32 psyllids across 13 (16.4%) of the 79 monitored fields. Many of the 79 total fields that we were sampling have been vine-killed.
Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (6 fields), Owyhee (2 fields), Twin Falls (2 fields), Jerome (1 field), and Power (1 field).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Our research with Russet Burbank in Idaho has shown that plants should be protected from infection with the ZC bacterium at least until one week before vine kill to reduce ZC symptoms. Therefore, we continue to urge growers to maintain their IPM programs.
We are not including “heat maps” this week given that they tend to show skewed patterns with smaller sample sizes.
Following recommendations from our ZC Advisory Committee last year, we shortened the duration of our monitoring program. This week we conclude the official monitoring program, though we will continue monitoring fields at the Kimberly Research & Extension Center as well as grower- and crop consultant-submitted samples. We will post any important updates that develop.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
2019 Vine Kill Recommendations - Late Blight infected and non-infected fields
Potato All Locations
Vine Kill
Posted on: August 30, 2019 by Pamela Hutchinson
Information about vine kill with little or no mechanical operations (beating/flailing, splitting vines). Late blight spores can spread by mechanical vine kill. Use of only vine-kill chemical products can provide enough reduction of plant material for efficient harvest.
Psyllid abundance remains relatively steady
Potato All Locations
potato psyllid
Posted on: August 29, 2019 by Erik Wenninger
This week we had traps deployed in 76 of the 79 fields (96.2%) monitored this year, and we found a total of 58 psyllids across 26 (32.9%) of the 79 monitored fields. Three of the 79 total fields that we were sampling have been vine-killed.
Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (10 fields), Elmore (4 fields), Twin Falls (4 fields), Jerome (2 fields), and Cassia (3 fields).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Overall psyllid captures have remained relatively steady over the last few weeks. However, we continue to urge growers to maintain their IPM programs.
“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. The moderately “hot spot” observed during recent weeks in the western Treasure Valley remains, with another small area of moderate pressure south of Mountain Home.
This was the last sample week for quite a few of our fields, so we likely will not include heat maps next week given that they tend to be skewed with smaller sample sizes.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
Fruit Field Day at Parma Research & Extension
Landscape and Garden All Locations
Posted on: August 29, 2019 by Maria Held
The University of Idaho Pomology and Viticulture Fruit Field Day is taking place on Friday, September 6th from 8:30 am to 1 pm at the University of Idaho Pomology Research Orchards and Vineyards
31727 Parma Rd, Parma, ID 83660. This is a free event for anyone interested in fruit production.
Please RSVP to maurineb@uidaho.edu or call 208-791-6228 with the number in your party.
See the attached flyer for directions.
Potato Disease Spore Trapping Bulletin August 19th to 23rd specific to the late blight outbreak in Paul
Potato All Locations
Potato Late Blight
Posted on: August 28, 2019 by James Woodhall
Late blight outbreak in Paul – update
Phytophthora infestans has been reported in eight fields in the Paul area. The initial findings were on the 19th of August. There have been no new reports since Friday 23 August.
In the spore trap directly located in the outbreak area, Phytopthrora infestans was detected on three of the four days it was operating. No other spore traps tested positive for Phytophthora infestans this week, including the spore traps at Acequia and east of Rupert. Also, no critical periods of humidity have been observed since the 13th of August. Therefore the risk of late blight outside the affected area near Paul is likely to be less than last week.
It is likely that the outbreak at Paul was associated with periods of high humidity above 90% for several hours observed on 30th and 31st July and on the 8th, 9th and 10th of August. No periods of 90% relative humidity have been observed at the Paul weather station since the 13th of August.
Growers in the immediate area close to the outbreak are asked to remain vigilant and continue to taking measures to protect themselves against late blight through comprehensive scouting and applications of the appropriate fungicides. Growers in the wider Magic Valley, particularly east of Paul, are advised to continue being vigilant for the pathogen, particularly if humidity levels increase. Although weather does not appear to be conducive for disease development, airborne spores have been detected and a risk still remains.
No spores were detected at Rexburg this week. The last detection there was the 31st July. No periods of critical humidity (RH 90% and above) have been observed since the 9th of August. Risk levels can now be considered ‘normal’ for this area.
James Woodhall
Potato Disease Spore Trapping Bulletin August 12th to 18th plus further information on the late blight outbreak in Paul
Potato All Locations
Potato Late Blight
Posted on: August 22, 2019 by Juliet Marshall
At the request of Dr. James Woodhall, I am sending this late blight update. This is additional information to that sent yesterday by Dr. Jeff Miller.
News for the current week
Late blight disease was observed in six fields in the vicinity of Paul on Monday 19th August. This was confirmed by both PCR and LAMP and the genotype was determined to be US23.
Spores of Phytophthora infestans (late blight) were found on two days at Acequia and at one day in Rupert in spore traps (these are the two nearest traps to the outbreak).
Spores of Alternaria solani (early blight) were found at Parma (4 days), Golden Valley (1 day), Tetonia (1 day), Acequia (3 days) and Rupert (3 days).
Spores of Sclerotinia sclerotium (white mold) were found at Acequia (2 days) and Golden Valley (1 day).
Recommendations
Growers in the vicinity of the outbreak should include fungicides with activity to Phytohthora infestans in their spray program. Please consider that spores were found up to 15 miles away from the infected area (see risk maps attached).
Growers in the rest of the Magic Valley should be on high alert for Phytophthora infestans and actively scout for the disease and consider using appropriate fungicides in their spray program.
We also ask that growers in the Rexburg area continue to be vigilant and scout for the pathogen as a spore trap there was positive for P. infestans a few weeks ago.
The risk outside those areas is likely to be relatively low, prior to the detection in Rexburg on the 31st July, no other trap in the network has tested positive since June. Nevertheless please consider late blight has been reported in Idaho and is a potential source of inoculum.
Detailed information on late blight disease, its management, sources of help and diagnosis, are provided in the document attached.
Best wishes,
James, Kasia and Phill
» Late blight outbreak more information
» Map
» Graphic
Psyllid monitoring update 22 Aug 2019
Potato All Locations
Potato Psyllid
Posted on: August 22, 2019 by Lucy Standley
This week we had traps deployed in 78 of the 79 fields (98.7%) monitored this year, and we found a total of 52 psyllids across 26 (32.9%) of the 79 monitored fields. One of the 79 total fields that we were sampling has been vine-killed.
Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (9 fields), Owyhee (2 fields), Elmore (1 field), Twin Falls (6 fields), Jerome (3 fields), Cassia (1 field), and Minidoka (1 field).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Overall psyllid captures have remained relatively steady over the last few weeks. However, we continue to urge growers to maintain their IPM programs.
“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. The “hot spots” observed during recent weeks in the western Treasure Valley have diminished somewhat.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
August 2019 Idaho outbreak of potato late blight – further information and recommendations
Potato All Locations
Late Blight
Posted on: August 22, 2019 by James Woodhall
Please see the attached sheets for more information on the current late blight outbreak in southern Idaho.
Idaho Association of Plant Pathology Annual Meeting, Nov 6 -7 in Twin Falls, Idaho
All Crops All Locations
IAPP
Posted on: August 21, 2019 by Juliet Marshall
This is an invitation and call for papers for the 2019 annual meeting of the Idaho Association of Plant Protection in Twin Falls, ID at the Canyon Crest Dining and Event Center. The conference will cover all aspects of plant protection including entomology, nematology, weed science and plant pathology.
Please consider contributing research results, observations, unusual pest and disease occurrences and topics which could be discussed as a group, etc. to the meeting. Each presentation will be allotted at least a 20-minute time slot. A final program will be advertised in October. Registration begins at 12:30 p.m. on Wednesday and the program will begin at 1:00 p.m. Registration costs $15.00 and can only be made by check or cash. Certified Crop Advisor (CCA) and Pesticide Recertification credits (ISDA) will be available.
Hotel reservations must be made on your own.
Please reply by email and / or complete and return the bottom half of the attached form. If you are not attending this meeting but would like to be notified of future meetings, please send us your updated contact information. Responses can be sent to:
James Woodhall
jwoodhall@uidaho.edu
University of Idaho, Parma R&E Center
Late blight found in southwestern Minidoka County
Potato All Locations
Late Blight
Posted on: August 19, 2019 by Jeff Miller
Late blight has been found in southwest Minidoka County near the town of Paul in multiple potato fields. Late blight sporulation was observed on diseased tissue. The University of Idaho will be checking for additional confirmation by PCR.
Weather conditions are not favorable for pathogen spread, but the blight is extensive in some of these fields. Risk of spread would be very high if thunderstorms develop. It is recommended that growers maintain an effective fungicide program to protect against late blight. Additional information on late blight fungicides can be found at the website below. The article was written in 2018, but the information is still applicable for this year.
Miller Research is interested in mapping the extent and severity of the blight. If you find late blight, please let us know. Locations will be kept confidential.
Tomato Fruit Issues
Landscape and Garden All Locations
Posted on: August 19, 2019 by Maria Held
Are you experiencing issues with you tomato fruit like blossom end rot, catfacing, splitting, zippering and such? Below are some links to help you determine what is going on with your tomatoes. Remember that variety selection and consistent watering are important in preventing some of these problems.
» http://vegetablemdonline.ppath.cornell.edu/NewsArticles/Tom_ComDis.htm
» http://blogs.cornell.edu/livegpath/gallery/tomato/zippering-fruit-disorder-on-tomatoes
» http://blogs.cornell.edu/livegpath/gallery/tomato/thrips-and-their-feeding-injury/
» http://blogs.cornell.edu/livegpath/gallery/tomato/feeding-injury-caused-by-stink-bugs/
First call for topics for the 2020 Idaho Potato Conference
Potato All Locations
Posted on: August 19, 2019 by Jerry Neufeld
This the first call for topics for the 2020 Idaho Potato Conference that will take place in Pocatello on January 22nd and 23rd. Please provide your ideas for potential workshops and presentations for this year's conference to Kasia Duellman (kduellman@uidaho.edu), Nora Oslen (norao@uidaho.edu) or Mike Thornton (miket@uidaho.edu) by September 16th so that we can put together a preliminary list for a program planning meeting. Please also take the time to survey your stakeholders for any input and indicate whether you would be interested and willing to present a workshop or seminar.
Thank you, and we look forward to seeing your responses.
Sincerely,
Kasia Duellman, Nora Olsen and Mike Thornton
Co-Chairs 2020 UI Potato Conference
UI Ag Talk Tuesday August 20 at 8:00AM in Rupert
All Crops All Locations
General announcment
Posted on: August 16, 2019 by Kasia Duellman
Join us for the last scheduled UI Ag Talk Tuesday of 2019 on Tuesday, August 20 at 8:00 AM at the University of Idaho Minnidoka County Extension Office (85 E Baseline Rd, Rupert, ID).
Invited Speakers:
Jason Thomas - Utilizing Barn Owl Boxes to Manage Voles
Steve Hines - Cover Crops
Other Topics are determined by YOU. Interaction and input from all attendees are welcomed and encouraged.
You can join in person, or by phone by dialing the following number and meeting ID:
Call-in Number: (669) 900-6833
Meeting ID: 349427773
You can also join the meeting by using Zoom on your computer:
Zoom link: https://uidaho.zoom.us/j/349427773
2019 Organizers: Kasia Duellman (kduellman@uidaho.edu), Pam Hutchinson (phutch@uidaho.edu), and Juliet Marshall (jmarshall@uidaho.edu)
Previous newsletters related to these sessions are available here: https://webpages.uidaho.edu/extension-seed-potato/ATT.html
August 15, 2019 Psyllid Monitoring Update
Potato All Locations
Potato Psyllid
Posted on: August 15, 2019 by Lucy Standley
This week we had traps deployed in 76 of the 79 fields (96.2%) monitored this year, and we found a total of 55 psyllids across 24 (30.4%) of the 79 monitored fields. One of the 79 total fields that we were sampling has been vine-killed.
Psyllids were collected on sticky traps in potato in the following counties: Payette (2 fields), Canyon (11 fields), Owyhee (1 field), Elmore (1 field), Gooding (1 field), Twin Falls (5 fields), Jerome (1 field), Cassia (1 field) and, Minidoka (1 field).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Overall psyllid captures have remained relatively steady over the last few weeks. However, we continue to urge growers to maintain their IPM programs.
“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. We continue to observe a “hot spot” in the western Treasure Valley.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
Corn Earworm Counts - 8/14/19
Corn Treasure Valley
corn earworm
Posted on: August 14, 2019 by Jerry Neufeld
Click on the pdf below to see the corn earworm counts taken this morning. It appears there are still CEW moths in the valley; however, the threat of damage should be getting smaller since the CEW moths lay eggs in fresh silk, and there is less and less fresh silk around each day.
Malheur Experiment Station Onion Variety Day August 27
All Crops All Locations
Posted on: August 14, 2019 by Janet Jones
You are invited to the Malheur Experiment Station Onion Variety Day!
Place: Malheur Experiment Station, 595 Onion Ave, Ontario, OR
in the field off Onion Avenue under the canopy.
Date: Tuesday, August 27, 2019
Registration starts at 9:00am with donuts and refreshments in the onion field.
A complimentary lunch will be served at noon in the barn.
Click on the PDF below for the Flyer.
Please RSVP for lunch or if you need more information call
Jan Jones at (541) 889-2174 or email janet.jones@oregonstate.edu.
August 8, 2019 First psyllid in eastern Idaho this year
Potato All Locations
Potato Psyllid
Posted on: August 8, 2019 by Lucy Standley
This week we had traps deployed in 78 of the 79 fields (98.7%) monitored this year, and we found a total of 73 psyllids across 27 (34.2%) of the 79 monitored fields. However, we are still waiting to receive traps from 3 sites in the Magic Valley. One of the 79 total fields that we were sampling has been vine-killed.
Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (9 fields), Elmore (2 fields), Gooding (1 field), Twin Falls (6 fields), Jerome (1 field), Cassia (2 fields), Minidoka (2 fields), and Bingham (1 field). This was our first capture of a potato psyllid this year in eastern Idaho, which consistently has shown later first incidence of psyllids and lower abundance overall.
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Psyllid captures have fluctuated only a bit over the past three weeks, and thankfully we have not observed hot psyllids since mid-July.
“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. “Hot spots” continue to be observed in the western Treasure Valley.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
Corn Earworm Counts - 8/6/19
Corn Treasure Valley
corn earworm
Posted on: August 6, 2019 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, August 6. There may be a few more moths this week, but the counts are still not real high. I am also including moth counts taken from the Grandview area. There are corn earworm moths around the valley, scouting on a more localized basis is still probably a good thing to do. I do not like the way the table displays in this box, so click on the pdf below to see the moth counts.
August 1, 2019 Psyllid captures declined a bit this week
Potato All Locations
Potato Psyllid
Posted on: August 1, 2019 by Lucy Standley
This week we had traps deployed in 81 of the 82 fields (98.7%) monitored this year, and we found a total of 67 psyllids across 27 (32.9%) of the 82 monitored fields. However, we are still waiting to receive traps from 19 sites in eastern Idaho. One of the 82 total fields that we were sampling has been vine-killed.
Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (12 fields), Owyhee (1 field), Elmore (3 fields), Twin Falls (6 fields), Cassia (1 field), and Minidoka (1 field).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Psyllid captures dropped a bit relative to last week; however, we continue to urge growers to maintain their IPM programs, especially given that we have historically seen an increase in captures during August.
“Heat maps” of this week’s results will soon be included on the UI and WSU websites (see links below), pending resolution of technical difficulties we are currently having with them.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
Blossom End Rot on Summer Squash and Tomato
Landscape and Garden Treasure Valley
Blossom End Rot on Squash and Tomato
Posted on: July 31, 2019 by Maria Held
Blossom end rot is showing up on summer squash. Tomatoes, peppers, eggplant and even watermelon may be affected. It occurs in the first fruits formed on the plants and is caused by a lack of calcium in the fruit. Most garden soils a sufficient supply of calcium; refer to your soil test results. However, uneven watering may cause symptoms in fast growing plants.
» https://pender.ces.ncsu.edu/2013/05/why-are-my-squash-rotting/
» https://www.canr.msu.edu/resources/blossom_end_rot_tip_sheet
Corn Earworm Counts - 7/31/19
Corn Treasure Valley
corn earworm
Posted on: July 31, 2019 by Jerry Neufeld
Below are the corn earworm moth counts from this morning. The greatest number of moths were found south of Lake Lowell and near Melba. Still, the numbers are fairly low. I am not aware of any thresholds in Idaho for this pest. According to a Purdue Extension publication entitled CORN INSECT CONTROL RECOMMENDATIONS – 2016, “control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheromone trap just before or during silking.” You may want to scout cornfields for this pest, especially south of Lake Lowell and near Melba.
Location Date 7/31/19
South of Caldwell 5
South of Lake Lowell 18
South of Nampa 3
Melba 12
South of Melba 13
SouthWest of Homedale 7
West of Wilder 1
Between Parma & Wilder 3
West of Caldwell 7
UI Ag Talk Tuesday August 6 at 8:00AM in Pocatello
All Crops All Locations
General announcment
Posted on: July 30, 2019 by Kasia Duellman
Join U of I Extension personnel next Tuesday, August 6, for another UI Ag Talk Tuesday session, held this time at 8:00 AM at the Bannock County Extension office, 10560 Fairgrounds Rd, Pocatello.
The featured topic will be presented by U of I Extension specialist Ben Eborn, UI Extension Ag Economist. He will talk about economics/cost of production/markets forecast. Other topics are determined by YOU and those who attend, either in person or by Zoom.
To attend by Zoom,
Call-in Number: (669) 900-6833
Meeting ID: 349427773
(Optional) Zoom link: https://uidaho.zoom.us/j/349427773
See you there!
The UI Ag Talk Tuesday sessions are held first and third Tuesdays during the growing season (May through August) unless otherwise indicated, at different locations across southeastern Idaho. Following the sessions, a newsletter is made available that summarizes the topics discussed and provides articles on other timely topics.
Blossom Drop on Tomatoes and Peppers
Landscape and Garden Treasure Valley
Blossom Drop
Posted on: July 29, 2019 by Maria Held
Gardeners are experiencing blossom drop on their tomatoes and other vegetables. This is due to high daytime > 90 F and low nighttime <55 F temperatures we have been experiencing. Pollen becomes sterile during hot weather. Fertilizer high in nitrogen and lots of water lead to growth of leaves instead of fruit set.
» https://extension.oregonstate.edu/news/why-vegetables-drop-blossoms
