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Black Mold on Onion
Onion Treasure Valley
Black Mold of Onion - Aspergillus niger
Posted on: August 21, 2015 by Stuart Reitz
Black mold has been found in some early harvested onions in the Treasure Valley.
Black mold is caused by the fungus Aspergillus niger. This disease can develop in the field or during storage. The predominant symptom is a black discoloration of tissue. Infected bulbs may show blackening at the neck, streaks or spots of black fungal spores on or beneath the outer scales, and black discoloration in bruised areas.
Bulbs usually get infected by the fungus through wounds, especially through the neck as onions mature and tops fall over or are cut. The fungus is common in the soil and on dead plant material and spores can readily spread through the air.
Therefore, keeping bulbs in good condition will help prevent disease development.
It is critical to promptly and adequately dry bulbs after harvest so there is not too much moisture in the necks to promote disease development. Remember, warmth and moisture favor disease development.
It is also important to avoid wounding and bruising when bulbs are harvested, transported, or stored.
Storing bulbs at low temperatures (35°F to 55°F) and low humidity helps to control black mold if the bulbs have been cured properly.
Handouts from the Late Blight Management Meetings
Potato All Locations
Late blight
Posted on: August 20, 2015 by Jeff Miller
Meetings were held in American Falls and Idaho Falls on August 18 focused on providing information on late blight management in potato. PowerPoint handouts from those meetings are attached here. The first reviews management in the field up until harvest. The second discusses storage management. The third discusses vine kill as it relates to late blight management.
» Managing Late Blight Late Season
2015 Idaho Association of Plant Protection Annual Meeting
All Crops All Locations
Posted on: August 20, 2015 by Jeff Miller
This is a call for presentations for the 2015 annual meeting of the Idaho Association of Plant Protection in Jerome, ID at the Best Western Sawtooth Inn and Suites. The meeting will be held Wednesday, November 4 from 1:00 pm to 5:00 pm (registration starts at 12:30) and Thursday, November 5 from 8:00 am to 12:00 pm. Please consider contributing research results, observations, unusual disease occurrences, topics which could be discussed as a group, etc. to the meeting. Each presentation will be allotted a 20 minute time slot. Please let us know if you feel you would need more or less time. A final program will be advertised in early 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 at the Best Western Sawtooth Inn can be made by calling 208-324-9200. Indicate you will be attending the IAPP meetings. Regular rooms are available at the corporate rate of $69.99 + tax, but reservations must be made prior to October 12.
Please reply by email or complete and return the bottom half of the attached sheet. 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 either Erik Wenninger at erikw@uidaho.edu or Trent Taysom at trent@millerresearch.com.
Canyon SCD Tour
Announcements Treasure Valley - Idaho
Posted on: August 19, 2015 by Jerry Neufeld
The Canyon County Soil Conservation District is holding its 6th Annual 319 Tour of Best Management Practices on August 25, 2015. Click on the pdf below for more details.
Clarification on late blight meeting
Potato All Locations
Late blight
Posted on: August 14, 2015 by Jeff Miller
The previous alert did not specify the locations for the late blight management meetings:
American Falls at the American Falls High School Auditorium - Tuesday, August 18 from 10:00 am -12:00 pm
Idaho Falls at the University of Idaho (Tingey Administration Building auditorium) – Tuesday, August 18 from 1:30 pm – 3:30 pm
Managing Late Blight Going into Storage
Potato All Locations
Late blight
Posted on: August 14, 2015 by Jeff Miller
Please note that the American Falls meeting outlined below replaces the meeting planned for Aberdeen!
The University of Idaho and Miller Research are sponsoring a meeting on managing late blight going into storage. The meeting agendas are as follows:
American Falls - Tuesday, August 18 from 10:00 am -12:00 pm.
Idaho Falls – Tuesday, August 18 from 1:30 pm – 3:30 pm
Dr. Jeff Miller will speak first and discuss proper disease identification, pathogen life cycle and biology, disease management considerations in the field, and appropriate use of fungicides late season through vine kill.
Dr. Nora OIsen will discuss post –harvest fungicide use and selection and proper storage management considerations.
Two ISDA recertification credits are available.
potato psyllid update
Potato All Locations
potato psyllids
Posted on: August 14, 2015 by Erik Wenninger
Abundance of potato psyllids captured in potato fields in Idaho is up slightly from last week. We captured 63 psyllids on sticky cards in fields across the Treasure and Magic Valleys, including fields in Payette, Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, and Cassia counties. In addition, we found one potato psyllid nymph on a leaf sample from a field in Gooding County.
All of the psyllids collected last week (cards deployed during the week of July 26 and collected during the week of August 2) tested negative for liberibacter (Lso), the bacterium that causes zebra chip.
We captured 43 psyllids from our fortnightly bittersweet nightshade sampling around the Treasure and Magic Valleys. This also is up slightly from the previous samples.
We collected tubers this week and last from several fields that have had the highest incidence of liberibacter-positive psyllids. Foliar symptoms were mostly lacking and, although most tubers examined were clean, a few were found with apparent zebra chip (ZC) symptoms. These samples are being tested for liberibacter, which is the only way to determine with certainty whether or not the plants actually have ZC.
Although all psyllids collected last week were negative for liberibacter and tuber samples that we have examined have been mostly clean, the level of liberibacter found in psyllid samples from Canyon and Ada counties during recent weeks suggests that risk of ZC may be higher in this area. Therefore, we encourage growers and crop consultants to scout for symptomatic plants and to consider this risk level when making insecticide decisions through the remainder of the season.
Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
new layout for PNWPestAlert.net
Announcements All Locations
Posted on: August 14, 2015 by Jerry Neufeld
We are excited to announce a new look and added functionality for the PNWPestAlert.net website. We have been busy this summer, working with our programmer to change the look of the website, as well as adding some additional functions. In a few days we will change over to the new webiste and begin using it. We are also adding content area for “Landscapes and Gardens”. This area of the website will be administered by Ariel Agenbroad, Area Extension Educator for Food Systems & Small Farms with University of Idaho Extension. On the new homepage, you will now see three categories for Alerts: Current Alerts will show all Alerts posted to the website; Crop Alerts will show only Alerts related to agricultural crops; and Landscape and Garden Alerts will show only Alerts related to urban landscapes and garden environments. Current subscribers do not need to do anything different to continue to receive your chosen alerts. However, if you would like to make changes to your user profile or sign up to receive “Landscape and Garden” alerts, you can do that by clicking on “Edit User Profile” (lower left hand side on the new home page) and then make any desired changes to your profile.
We hope you enjoy the new look and functionality of the website and bear with us while we get the bugs out of the new system (no pun intended). If you encounter any issues with the new site, please contact us at jerryn@uidaho.edu or ariel@uidaho.edu and we will address your concerns as soon as possible.
Jerry Neufeld
Ariel Agenbroad
Late blight management meeting
Potato All Locations
Late blight
Posted on: August 14, 2015 by Jeff Miller
A meeting on managing late blight going into storage will be held at the Aberdeen High School on Tuesday, August 18 at 10:00 AM. Speakers will be Dr. Nora Olsen (University of Idaho) and Dr. Jeff Miller (Miller Research). Call Jeff at 208-431-4420 for more information.
Malheur Exp. Station Onion Variety Day
Onion Treasure Valley - Oregon
Posted on: August 14, 2015 by Bill Buhrig
Please join us for the annual Onion Variety Day at the Malheur Experiment Station outside of Ontario on August 25. Tour the plot in the morning and catch lunch as well! It will be a good time!
Check out the attached PDF for more information!
More late blight samples
Potato All Locations
Late blight
Posted on: August 14, 2015 by Jeff Miller
Late blight had been confirmed in additional counties. Positive samples were confirmed in Madison, Fremont, and Jefferson counties yesterday and this morning. Two samples have also been confirmed in Cassia County - one on the east side an another on the west.
Late blight in Cassia, Madison, Fremont, and Jefferson Count
Potato All Locations
Late blight
Posted on: August 13, 2015 by Jeff Miller
Late blight had been confirmed in additional counties. Positive samples were confirmed in Madison, Fremont, and Jefferson counties yesterday and this morning. Two samples have also been confirmed in Cassia County - one on the east side an another on the west.
Potato Diseases Update
Potato Eastern Idaho
late blight, early blight, white mold, bacterial stem rot
Posted on: August 8, 2015 by Phillip Wharton
In the Treasure Valley area Dr. Mike Thornton reports that they are primarily seeing white mold, bacterial stem rot and early blight. The crop is beginning to senescence in some fields, and growers should be carefully monitoring soil moisture to make sure they match water applications to crop use.
In the rest of southern and south eastern Idaho conditions remain favorable for late blight. With the current frequent rain showers and thunderstorms moving through the area and cooler night time temperatures growers should be very vigilant for late blight. In the past two weeks, Dr. Jeff Miller has reported that most of the late blight out breaks have been spread by the thunderstorms moving through the area. This is evident by the uniform levels of disease spread throughout infected fields instead of in isolated infection points or at the edge of fields spreading inwards.
In the past week, the University of Idaho has confirmed 4 more positive infections in Power county and two more in Bingham county but none in Minidoka county. To date, the late bight out breaks appear to be limited to these three counties. All isolates from these outbreaks have been identified as the US 23 genotype and mefenoxam (Ridomil) sensitive.
As we move towards harvest, growers affected by late blight need to be aggressive in managing the disease at the end of the season and going into storage. Growers should be aware that in addition to attacking foliage, late blight can infect tubers at any stage of development before and after harvest and in storage, with symptoms and rot usually only showing up in storage. Late blight infection of tubers is characterized by irregularly shaped, slightly depressed brown to purplish areas on the skin. These symptoms may be less obvious on russet and red-skinned cultivars. A tan to reddish-brown, dry, granular rot is found under the skin in the discolored area, extending into the tuber usually less than half an inch. For more information and photos of late blight tuber symptoms see the attached link (http://bit.ly/1KWFt6a).
Late in the season it is advisable to avoid excessive irrigation as tubers become infected with late blight when spores wash down through the soil from infected leaves. Vines should also be killed at least two weeks before harvest, especially in blight infected fields. This interval minimizes the chance of tubers getting contaminated with late blight inoculum during harvest, and allows previously infected tubers to decompose in the field. If blight is present in the field or in the vicinity of the field at harvest, it may also be beneficial to spray foliage after vine killing with labeled fungicides to kill living late blight spores on the foliage.
For more detailed information on a late season checklist for managing late blight and fungicide fungicide recommendations see the attached link (http://bit.ly/1Kb3ELg).
For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases
Late blight update
Potato All Locations
Late blight
Posted on: August 8, 2015 by Jeff Miller
Late blight is spreading in several locations in southern Idaho. Please see the attached "Late blight update" for a summary of the epidemic and an overview of control measure. We have also attached a review of fungicides available for late blight control along with a checklist for managing late blight going into storage.
Links to web pages from the University of Idaho and Miller Research with additional information are listed below.
» http://www.millerresearch.com/alerts/pest-alerts/item/49-late-blight-management-2015
» http://www.idahopotatodiseases.org/lateblight.html
Potato psyllid abundance similar to recent weeks; more Lso-p
Potato All Locations
potato psyllids
Posted on: August 7, 2015 by Erik Wenninger
Abundance of potato psyllids in potato fields in Idaho this week was similar to the past two weeks, if not slightly lower. We captured 37 psyllids on sticky cards in fields across the Treasure and Magic Valleys, including fields in Payette, Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, and Cassia. In addition, we found a potato psyllid on a card from a field in Power County that was collected last week and submitted to our lab this week.
From week 10 of sampling (cards deployed the week of July 12th and collected the week of the 19th), we collected 14 psyllids that tested positive for liberibacter (Lso), the bacterium that causes zebra chip. All were from fields in Canyon or Ada counties.
From week 11 we had several psyllids, mostly in the Treasure Valley, that tested positive for liberibacter (Lso), the bacterium that causes zebra chip. Positive psyllids were found in Payette County, Canyon County (four different fields), Ada County (15 positive psyllids in one field), Owyhee County, and Twin Falls County. In addition, we found positive psyllids at our bittersweet nightshade site in Murtaugh and at Dierkes Lake in Twin Falls (one from each site).
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
corn earworm
Corn Treasure Valley
corn earworm
Posted on: August 6, 2015 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, August 6. Corn earworm moths lay eggs in corn with fresh silk. Since silking is done for the year, this will be my last corn earworm count for the growing season.
Melba Area 0
South of Nampa 0
Middleton Area 0
Parma Area 8
Wilder Area 44
Homedale Area 4
Pride Lane 0
Spider Mites
All Crops Treasure Valley
Spider MItes
Posted on: July 31, 2015 by Stuart Reitz
Two-spotted spider mites are being found in bean and mint fields in the Treasure Valley. With the return of very hot weather, spider mite populations may build up rapidly to damaging levels.
Scout bean, mint and other susceptible crops, such as sugar beets, corn, and potato, to determine if action is necessary. For more information on two-spotted spider mites, consult the PNW Insect Handbook at the link below and contact the extension office.
More positive psyllids in Ada County; first Payette and Powe
Potato All Locations
Potato Psyllid
Posted on: July 31, 2015 by Erik Wenninger
Abundance of potato psyllids in potato fields in Idaho this week slightly increased, with 57 psyllids captured (compared to 43 last week) across the Treasure Valley, Magic Valley, and Upper Snake. Psyllids were captured this week from several fields in Ada and Canyon counties, as well as from sites in Owyhee, Payette, Twin Falls, Jerome, Cassia and Power counties. This represents the first psyllid captured in Payette as well as in Power County.
Last week we were waiting for results from psyllids captured on cards deployed in potato fields July 6th to 13th. Five psyllids from two different fields in Ada County tested positive for liberibacter (Lso), the bacterium that causes zebra chip. We continue to run a little behind receiving results, but they will be posted on the website below as soon as they come in. Please continue checking throughout the week. We are still waiting on results from psyllids captured last week.
We captured 27 psyllids at our bittersweet nightshade sites around the Treasure and Magic Valleys.
We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
Grape Mealybugs
All Crops Treasure Valley
grape mealybugs
Posted on: July 30, 2015 by Jerry Neufeld
Large numbers of male grape mealybugs have been found in two of the pheromone lure traps in the winegrape research vineyard trial plots in Parma between 7/23 and 7/29 . Mealybugs damage grapes by contaminating clusters with cottony egg sacs, larvae, adults, and honeydew. To date, we have not seen any evidence of crawlers, egg sacs or females on any winegrape vines in the vineyard trial plots.
In the winegrape research trial plots we have made 3 pesticide applications for mealybug this season- a late dormant oil, an early season and a July 17 foliar application of Provado (thiacloprid) - so it is likely that we are trapping males from a source outside of the winegrape trial plots. Susceptibility to mealybug damage varies by variety. It is worse on varieties that produce clusters close to the base of the shoot because the fruit often touches old wood. There is also the potential for the grape mealybug to vector leaf roll virus in grapes. For more information on this pest, including photos and management strategies, visit http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug and http://www.ipm.ucdavis.edu/PMG/r302301811.html.
» http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug
Grape Mealybugs
All Crops Treasure Valley
grape mealybugs
Posted on: July 30, 2015 by Jerry Neufeld
Large numbers of male grape mealybugs have been found in two of the pheromone lure traps in the winegrape research vineyard trial plots in Parma between 7/23 and 7/29 . Mealybugs damage grapes by contaminating clusters with cottony egg sacs, larvae, adults, and honeydew. To date, we have not seen any evidence of crawlers, egg sacs or females on any winegrape vines in the vineyard trial plots.
In the winegrape research trial plots we have made 3 pesticide applications for mealybug this season- a late dormant oil, an early season and a July 17 foliar application of Provado (thiacloprid) - so it is likely that we are trapping males from a source outside of the winegrape trial plots. Susceptibility to mealybug damage varies by variety. It is worse on varieties that produce clusters close to the base of the shoot because the fruit often touches old wood. There is also the potential for the grape mealybug to vector leaf roll virus in grapes. For more information on this pest, including photos and management strategies, visit http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug and http://www.ipm.ucdavis.edu/PMG/r302301811.html.
» http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 30, 2015 by Jerry Neufeld
It appears corn earworm moths (adults) are starting to show up in slightly larger numbers, although, my trapping numbers are still fairly low. Below are the moth counts from this morning, July 30.
Melba Area 0
South of Nampa 0
Middleton Area 3
Parma Area 4
Wilder Area 18
Homedale Area 12
Pride Lane 0
I am not aware of Idaho treatment thresholds for this pest, however, the following excerpt was taken from an Extension Publication from Purdue University.
Management Guidelines
Corn Insect Control Recommendations: E-series 219-W (PDF)
For seed production fields, if 10 or more moths are captured in a pheromone trap for several consecutive nights, economic damage is possible. However, only fields silking and/or pollinating during this time are candidates for treatment.
You may want to step up your field scouting and work closely with your crop consultant to determine if a treatment is necessary.
» http://insect.pnwhandbooks.org/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/corn-sweet-corn-earworm
Pomology Program Annual Fruit Field Day
All Crops Treasure Valley
Posted on: July 29, 2015 by Jerry Neufeld
The University of Idaho Annual Fruit Field Day will be held on Friday August 28, 2015; 8:30 am to 1:00 pm at the U of I Parma Research and Extension Center Pomology Orchard and Vineyard site, about 4 miles north of Parma, Idaho. The registration will start at 8:30 am and program will start at 9:00 am (sharp). Click on the pdf below for more details.
Late blight
Potato All Locations
Posted on: July 28, 2015 by Jeff Miller
The late blight in Minidoka County has been determined to be the US-23 strain. This strain is sensitive to mefenoxam. As a result, growers can use Ridomil Gold pre-packs (e.g. Ridomil Gold Bravo, Ridomil Gold MZ) to manage late blight. Fields which have been treated with mefenoxam appear to be free of late blight even though they are close to fields with confirmed late blight.
Additional fields in Minidoka County have been confirmed, with the latest finds close to Rupert.
More information on fungicides for managing late blight can be found at the link below.
Zero positive potato psyllids from last week
Potato All Locations
Potato Psyllid
Posted on: July 24, 2015 by Amy Carroll
Overall abundance of potato psyllids in potato fields in Idaho this week continued to decline, with 43 psyllids captured (compared to 71 last week) across the Treasure and Magic Valleys. Psyllids were captured this week from several fields in Ada and Canyon counties, as well as from a few different sites in Elmore and Twin Falls counties. We are still waiting on a shipment of sticky cards from our “Light” sites (approximately 20 fields) in Cassia and Minidoka counties.
Zero psyllids from last week tested positive for liberibacter (Lso), the bacterium that causes zebra chip—one each from Canyon, Ada, and Minidoka counties.
We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 23, 2015 by Jerry Neufeld
I checked the corn earworm traps today. I found a few, but not too many. Below are the counts.
Location 7/16 7/23
Melba Area 0 0
South of Nampa 0 0
Middleton Area 0 0
Parma Area 0 0
Wilder Area 0 16
Homedale area 0 2
Pride Lane 0 0
