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corn earworm
Corn Treasure Valley
earworm
Posted on: July 23, 2014 by Jerry Neufeld
I am collaborating with Charter Seed Co. and Crookham Seed Co. on a project to trap corn earworm moths. We set out 7 traps in corn fields at various locations from near Melba to near Wilder. I am checking the traps every few days and posting the moth counts to this website.
Below are the moth counts from this week.
Location 7/23
caldwell area 0
melba area 0
north of lake lowell 0
west of greenleaf 0
east of wilder 0
west of wilder 0
north of homedale 0
corn earworm
All Crops Treasure Valley
earworm
Posted on: July 21, 2014 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,” states that summer CEW moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.pl?clm), we are currently at 1219 GDD in the Caldwell area and 1327 in the Parma area. We will hit 1300 GDD in the Caldwell area on approximately 7/25. Those fields with fresh silk at approximately 1373 GDD are most vulnerable to attack from corn earworm larvae. We will hit 1373 in the Caldwell area about 7/25 and 1373 in the Parma area about 7/23.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 egg per 2 silk masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
I am once again collaborating with Charter Seed Company and Crookham Company on a project to trap corn earworm moths at several locations in the Treasure Valley. We set out 7 traps at various locations from near Melba to near Wilder. I will check the traps every few days and post the moth counts to this website. Purdue University recommends a treatment threshold of 10 moths per trap per night.
For CEW control information from the 2014 Pacific Northwest Insect Management Handbook click on the links below for the type of corn you are growing.
» 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
» http://insect.pnwhandbooks.org/agronomic/field-and-silage-corn/field-and-silage-corn-corn-earworm
» CIS 366
corn earworm
All Crops Treasure Valley
earworm
Posted on: July 21, 2014 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,” states that summer CEW moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.pl?clm), we are currently at 1219 GDD in the Caldwell area and 1327 in the Parma area. We will hit 1300 GDD in the Caldwell area on approximately 7/25. Those fields with fresh silk at approximately 1373 GDD are most vulnerable to attack from corn earworm larvae. We will hit 1373 in the Caldwell area about 7/25 and 1373 in the Parma area about 7/23.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 egg per 2 silk masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
I am once again collaborating with Charter Seed Company and Crookham Company on a project to trap corn earworm moths at several locations in the Treasure Valley. We set out 7 traps at various locations from near Melba to near Wilder. I will check the traps every few days and post the moth counts to this website. Purdue University recommends a treatment threshold of 10 moths per trap per night.
For CEW control information from the 2014 Pacific Northwest Insect Management Handbook click on the links below for the type of corn you are growing.
» 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
» http://insect.pnwhandbooks.org/agronomic/field-and-silage-corn/field-and-silage-corn-corn-earworm
» CIS 366
potato psyllid and ZC update
Potato All Locations
potato psyllids and ZC
Posted on: July 18, 2014 by Erik Wenninger
We have observed a notable increase in the number of psyllids captured in our monitoring program this week relative to previous weeks this year (though still much lower than toward the end of the last two seasons). Psyllids were found on sticky traps in two potato fields in Canyon County, two fields in Elmore County, three fields in Twin Falls County, and two fields in Jerome County. In addition, this week we found potato psyllids on sticky cards deployed near bittersweet nightshade plants at two sites in Twin Falls County. These psyllids are currently being tested or are on their way to being tested for liberibacter (Lso, the bacterium that causes zebra chip). All psyllids collected so far this year have been negative for Lso. Some sticky cards from last week were just returned to our lab early this week and were also found to have potato psyllids (one psyllid from a field in Twin Falls County and two psyllids from a field in Jerome County); these psyllids are currently being tested for Lso.
Online spreadsheets with detailed results of psyllid captures are available at the links below. These are updated periodically over the week as data come into our lab.
Results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
ODA Emergency Rule on Imidacloprid and Dinotefuran Use on Li
Announcements Treasure Valley - Oregon
Posted on: July 11, 2014 by Stuart Reitz
On June 26, 2014, the Oregon Department of Agriculture (ODA) enacted an emergency(temporary) rule prohibiting the use of any product containing the neonicotinoid insecticides dinotefuran or imidacloprid, regardless of application method, on linden trees.
The Temporary Administrative Rule will be in effect June 26 - December 23, 2014, OAR 603-057-0387.
Additional regulatory action may take place before or after the expiration date of the temporary
rule.
What Does this Mean to You?
This means that if you have a container label that provides directions for use on linden trees, you can not apply it to linden trees, basswood trees or other Tilia species.
This rule prohibits the use of dinotefuran or imidacloprid to Tilia spp., regardless of application method, including but not limited to: foliar, bark treatment, soil drench, tree or soil injection, bark injection, and basal bark application.
» http://www.oregon.gov/ODA/PEST/docs/pdf/2014EmergencyImiDinoRule.pdf
potato psyllid and ZC update
Potato All Locations
potato psyllids
Posted on: July 11, 2014 by Erik Wenninger
Three potato psyllids were found this week in University of Idaho’s potato psyllid monitoring program. One psyllid was found for the first time at the Kimberly Research & Extension Center (Twin Falls County) in a vacuum sample from our insecticide trial plots. Two additional psyllids (one per field) were found in potato fields in Twin Falls and Jerome Counties on sticky traps. These psyllids are on their way to be tested for liberibacter (Lso, the bacterium that causes zebra chip). All psyllids collected so far this year have been negative for Lso. Some sticky cards have yet to be returned to our lab; results from those sites will be posted early next week.
We still encourage monitoring of potato psyllids, and insecticide programs should be prepared.
Online spreadsheets with detailed results of psyllid captures are available at the links below. These are updated periodically over the week as data come into our lab.
Results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
sugarbeet pests
Sugarbeets Treasure Valley
black bean aphid and powdery mildew
Posted on: July 11, 2014 by Jerry Neufeld
Powdery mildew has been found by Amalgamated Sugar Company Field Consultants in the Grandview, Idaho area. In addition, Black Bean Aphids have been found in sugarbeet fields in the Grandview and Nampa, Idaho areas. If Black Bean Aphids are found in your fields at a level requiring treatment, you can include an insecticide treatment for Black Bean Aphid in the mildew tank mix. Contact your Amalgamated Field Consultant for information regarding treatment recommendations.
New barley disease
Small Grains All Locations
Spot Form of Net Blotch
Posted on: July 7, 2014 by Juliet Marshall
Last year, a new barley disease was seen for the first time west of Blackfoot.
This year, numerous examples have been seen of the Spot Form of Net Blotch, also called SFNB. So far, we are not able to determine damage estimates for our production conditions. In other areas where the disease occurs (Montana, MonDak areas), losses of 50-75% have been reported. Again, there are no estimates of damage potential here. Full rates of fungicides are recommended for control in susceptible varieties. The 2014 PNW Plant Disease Management Handbook lists the following fungicides for control (this list may not be inclusive of all effective fungicides): Headline (6-9 fl oz/A), Stratego (7 fl oz/A), Vertisan (14-24 fl oz/A), Priaxor Xemium (4-8 fl oz / A).
Please see attached pictures.
» SFNB
» SFNB
stripe rust
Small Grains All Locations
Stripe rust in wheat and barley
Posted on: July 7, 2014 by Juliet Marshall
Stripe rust has been reported in UI Pettit in the Rockford area south west of Blackfoot.
Stripe rust has been reported in Snow Crest
Stripe rust has been reported in Paloma, Blackfoot area.
Stripe rust has been reported in WB936 on west side of Idaho Falls.
Stripe rust has been reported in a spring feed barley (http://www.westbred.com/Products/Northwest/Barley%20Documents/WESTBRED_501.pdf) north of Rupert and south of Burley. The barley was in milk to soft dough. Fungicide application is not recommended for the barley, and in addition the allowable time frame has passed for fungicide application in that field.
Warmer temperatures should slow the rate of spread, but the nighttime cool temperatures and irrigated conditions will still allow the fungi to advance. IF the infections are appearing within the appropriate time frame, fungicide application is recommended to reduce yield loss in susceptible varieties. Please read and follow all label directions.
Idaho Psyllid Monitoring Update
Potato All Locations
Potato Psyllids
Posted on: July 3, 2014 by Erik Wenninger
No new potato psyllids were found this week in University of Idaho’s potato psyllid monitoring program. All previously collected psyllids, including the three from last week, were found to be negative for Lso.
We still encourage monitoring of potato psyllids, and insecticide programs should be prepared.
Online spreadsheets with detailed results of psyllid captures are available at the links below. These are updated periodically over the week as data comes into our lab.
Results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
Malheur Experiment Station Farm Festival
Announcements Treasure Valley
Posted on: July 3, 2014 by Bill Buhrig
Everyone is welcome to come and check out the 2014 edition of the Malheur Experiment Station's Farm Festival on Wednesday, July 9 just south of Ontario. There will be vendor booths, field tours and lunch will be served. It is free to attend and will be a good time! Please check out the link for more information including driving directions and the field tours schedule. Registration starts at 8am. See you there!
Stripe rust on spring wheat
Small Grains All Locations
Stripe rust in wheat
Posted on: June 30, 2014 by Juliet Marshall
Stripe rust continues to expand in the susceptible winter wheat varieties, and is even developing in kernels of WB470. It is likely TOO LATE to spray fungicides on any winter wheat except those in the northernmost growing areas (Ashton, St. Anthony) and is most likely past legal application in those areas as well. Remember there is a pre-harvest interval for application - read and follow label directions.
It is NOT TOO LATE to protect susceptible spring wheat. High levels of SR are being reported in the Bingham county area in Snow Crest hard white spring wheat. Strobilurin fungicides will protect wheat from infection by stripe rust but will not have the curative properties if infection is present in the field - in that case it is best to include a triazole fungicide or mixes of strobi’s and triazoles.
Current conditions, especially these cool nighttime temperatures, are favorable for infection and continued spread.
Thanks to all who have reported the occurrence of SR in their area or fields!
» http://www.extension.uidaho.edu/scseidaho/disease/stripe_rust.htm
powdery mildew in sugarbeets
Sugarbeets All Locations
powdery mildew
Posted on: June 30, 2014 by Jerry Neufeld
Powdery mildew has been positively identified by Amalgamated Sugar Company Crop Consultants in sugarbeet fields in the western Treasure Valley of Oregon. There are several fungicides available for use to treat powdery mildew, including sulfur dusts. Depending on the disease pressure, applications with different chemistries should be repeated every 7 to 14 days. Contact your crop consultant from the Amalgamated Sugar Company if you have questions about treatment options.
Idaho Psyllid Monitoring Update
Potato All Locations
Potato Psyllids
Posted on: June 27, 2014 by Erik Wenninger
Three potato psyllids were found this week in University of Idaho’s potato psyllid monitoring program. One psyllid was found for the first time in Jerome County on a sticky trap in a potato field. Another psyllid was found in Canyon County on a sticky trap in a potato field. The third psyllid was found in a vacuum sample in Twin Falls county from a potato field. We are awaiting results on these psyllids and the psyllid found last week from the test for liberibacter (Lso, the bacterium that causes zebra chip). All other psyllids collected so far this year have been negative for Lso. Some sticky cards have yet to be returned to our lab, and results from those sites will be posted early next week.
We still encourage monitoring of potato psyllids, and insecticide programs should be prepared.
Online spreadsheets with detailed results of psyllid captures are available at the links below. These are updated periodically over the week as data comes into our lab.
Results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
stripe rust
Small Grains All Locations
Stripe rust in wheat
Posted on: June 25, 2014 by Juliet Marshall
Stripe rust has now been reported in multiple locations throughout the region, including areas near Shelley, Rising River, Plano, and Ft. Hall in the soft white winter varieties Brundage and WB 470. Some of the winter wheat crop is in grain fill, and milk to soft dough. Please be aware that the winter wheat growth stages may be beyond the labeled legal application of fungicides for pre-harvest intervals. Depending on fungicide, the cut-off timing may be 50% flowering - CHECK LABELS BEFORE application.
Of greatest concern now would be vulnerable spring wheats that are susceptible to stripe rust. These would include Klasic, Snow Crest, UI Pettit, WB 936, Lochsa, Lolo, Kelse, WB-Paloma.
» http://www.extension.uidaho.edu/scseidaho/disease/stripe_rust.htm
First Japanese Beetles of 2014 Caught in Boise
Announcements Treasure Valley - Idaho
Japanese Beetle
Posted on: June 23, 2014 by Paul Castrovillo
On June 19, the first two adult Japanese Beetles (Popillia japonica) of the 2014 field season were collected in a Japanese Beetle trap in Boise. ISDA has surveyed for this aggressive invasive pest from the eastern US since 1990. In 2012, 61 beetles were caught, most in downtown Boise, indicating the beginning of a possible infestation. An eradication program was begun in Boise in 2013, and trapping that summer turned up 2,999 beetles. The eradication program is continuing this year, with insecticide treatment of 500 residential/commercial properties, most Boise Parks and several areas on the BSU campus. The first treatments were conducted in May and a second treatment is scheduled in July. Traps have been set up with a very high concentration in the city of Boise and more dispersion throughout the rest of the state to continue to survey for beetle presence and monitor location and level of beetle activity to determine areas needing treatment. The flight period of adult Japanese Beetles typically begins in mid/late June and peaks around mid July. Adults feed on over 300 types of plants including roses and fruit trees, while larvae do considerable damage feeding on grass roots in areas with lawn and turf. If any Japanese Beetles are collected in Idaho, especially outside of the Boise area, please send the dead specimens, with collection location data, to Dr. Paul Castrovillo, Idaho State Department of Agriculture, P.O. Box 790, Boise, ID 83701.
Idaho potato psyllid monitoring update
Potato All Locations
potato psyllids
Posted on: June 20, 2014 by Erik Wenninger
One potato psyllid was found this week in University of Idaho’s potato psyllid monitoring program on a sticky trap in a potato field in Canyon County. We are awaiting results on this psyllid from the test for liberibacter (Lso, the bacterium that causes zebra chip). All other psyllids collected so far this year have been negative for Lso. Some sticky cards have yet to be returned to our lab, and results from those sites will be posted early next week.
We still encourage monitoring of potato psyllids, and insecticide programs should be prepared.
Online spreadsheets with detailed results of psyllid captures are available at the links below. These are updated periodically over the week as data comes into our lab.
Results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
» https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
» https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
» http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
Fruit Pest Advisory
Tree Fruits All Locations
PDF file error correction
Posted on: June 18, 2014 by Tony McCammon
My apologies if your PDF document did not open. Here is the correction.
Fruit Tree Advisory
Tree Fruits All Locations
WFCC, Codling Moth, Leafhopper, Mites, and Shothole disease
Posted on: June 18, 2014 by Tony McCammon
Attached find an advisory covering current spray recommendations and better orchard management considerations.
Idaho psyllid monitoring update
Potato All Locations
Posted on: June 13, 2014 by Erik Wenninger
No new psyllids were found this week in University of Idaho’s potato psyllid monitoring program, and all psyllids collected so far have been negative for liberibacter (Lso, the bacterium that causes zebra chip). This includes the few psyllids collected from bittersweet nightshade plants in Twin Falls County that had yet to be tested as well as some potato psyllids found on pepper plants at a local garden center.
We still encourage monitoring of potato psyllids throughout the Treasure and Magic Valleys, and insecticide programs should be prepared.
Online spreadsheets with detailed results of psyllid captures are available at the links below. These are updated periodically over the week as data comes into our lab.
Results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
» https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
» https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
» http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
OSU/U of I Cereals Variety Day in Parma
Small Grains Treasure Valley
Posted on: June 12, 2014 by Bill Buhrig
Oregon State and the University of Idaho invite interested folks to attend a Cereals Variety Day at the Parma R and E Center June 20th. It is free to the public and starts @ 9AM.
The attached flier has the directions and details.
Breeding and extension personnel from both OSU and U of I will be on hand to discuss the variety nurseries which include both wheat and barley in spring and fall trials. Lunch will follow around noon.
For more information or to RSVP, please give Bill Buhrig a call @ 541-881-1417 or email @ william.buhrig@oregonstate.edu.
Glyphosate-resistant kochia
Sugarbeets All Locations
kochia
Posted on: June 11, 2014 by Don Morishita
Suspected glyphosate-resistant kochia has been reported in at least two locations in western Idaho and eastern Oregon sugar beet fields. It is critical to watch for kochia escapes in sugar beet and Roundup Ready corn fields. Please report any suspicious kochia escapes to your local crop consultant, crop advisor, extension educator, Joel Felix (OSU weed scientist), or Don Morishita (UI weed scientist).
Iris Yellow Spot Virus (IYSV) in Onion
Onion Treasure Valley
Onion thrips / IYSV
Posted on: June 10, 2014 by Stuart Reitz
On June 9th, Iris Yellow Spot Virus was detected in a commercial onion bulb field in Malheur County and confirmed by diagnostic tests.
Although, there has been a substantial increase in onion thrips populations over the past week, the advanced symptoms (dried necrotic tissue) seen on some infected plants suggests the infection has been present for several weeks.
The early appearance of virus points out the need for onion producers to be vigilant in their thrips control programs.
This is especially important for fields close to overwintering onions or volunteers as these plants can act as a “green bridge” for onion thrips and IYSV.
In addition to thrips management, minimize stress on onion plants by making sure fields are maintained at an adequate fertility level, and that the soil moisture is kept at about the 20 centibar level. This will help reduce the severity of symptoms.
Please feel free to contact Stuart Reitz at Malheur County Extension if you have questions about your onion fields or would like assistance with virus diagnosis.
Idaho potato psyllid monitoring update
Potato All Locations
potato psyllids
Posted on: June 9, 2014 by Erik Wenninger
Last week we reported finding six potato psyllids across potato fields in Malheur (Oregon), Payette, and Canyon Counties. The sticky traps were collected by one of our cooperators, and we regret to report that there was a miscommunication regarding whether these potato psyllid identifications had been confirmed by an expert entomologist. After arrival of the samples at the Kimberly R&E Center over the weekend, we confirmed that these were NOT potato psyllids. We apologize sincerely for the error. All future samples will run through our lab (or a qualified entomologist known to our program) before being reported (this has always been our policy, but a miscommunication regarding whether this had happened caused this mistake).
Although we now have no confirmed potato psyllid captures in potato fields in the Treasure Valley, we do have confirmed reports of potato psyllids in the Columbia Basin (both Washington and Oregon), and we have confirmed potato psyllids from our sampling network in Jerome County (potato field) and Twin Falls County (bittersweet nightshade sites). Therefore, monitoring throughout the Treasure and Magic Valleys should be increased and insecticide programs should be prepared.
All potato psyllids tested so far for liberibacter (Lso, the bacterium that causes zebra chip) have been negative. This includes the psyllid found in Jerome County and the first three psyllids found on bittersweet nightshade plants in Twin Falls County.
The online spreadsheets with updates of psyllid captures occurring throughout the week are up and running. Results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
» https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
» https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
» http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
More potato psyllids found in Idaho potato fields
Potato All Locations
potato psyllids
Posted on: June 7, 2014 by Erik Wenninger
The University of Idaho, in collaboration with Miller Research and several crop consultants across the state initiated a scouting program during the week of May 18 that covers commercial potato fields throughout southern Idaho.
Earlier this week, we reported finding one potato psyllid on a yellow sticky trap in a potato field in Jerome County. In addition, this week on yellow sticky traps we have found a total of six more psyllids across four potato fields located in Malheur (Oregon), Payette, and Canyon Counties.
This week we also collected six psyllids across two bittersweet nightshade sites in Twin Falls County.
All of these psyllids have been sent to the main campus to be tested for liberibacter (Lso), the bacterium that causes zebra chip disease.
The online spreadsheet that shows detailed results of the monitoring efforts and location of fields (by county) will be available very soon.
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
» http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
