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Wheat Disease Update – 28 May 2016

This article is written by Dr. Bob Hunger, Extension Wheat Pathologist.

Department of Entomology & Plant Pathology – 127 Noble Research Center

Oklahoma State University – Stillwater, OK

405-744-9958 (work) – bob.hunger@okstate.edu

This likely will be my last OK disease update for a while as diseases have mostly “run their course” in Oklahoma and harvest has started.  However, I wanted to provide a follow-up on the late season root rots we saw at several locations across northern Oklahoma.  Symptoms and a description of the setting in the field all pointed to take-all in several of the samples, and Jen Olson in the Diagnostic Lab and I did find visual signs of the take-all fungus.  With further examination, Jen found lesions indicative of Rhizoctonia root rot, and subsequently, she isolatedRhizoctonia.  In another sample with whiteheads that to me appeared to be take all, Jen isolated Parastagonospora nodorum and Fusarium (most likely acuminatum as indicated by DNA sequencing).  In a third sample in which roots appeared clean but the lower stems were discolored, Jen isolated Rhizoctonia, but also more commonly Fusarium (again most likely acuminatum), Curvularia, and Parastagonospora.  Likely some of these were secondary.  So, the exact cause of the whiteheads is somewhat uncertain with Rhizoctonia root rot, take-all, and perhaps some Fusarium-induced root rot all involved.

Reports/excerpts of reports from other states:  Just to let you know, stripe rust appears to be a major disease up through the northern Great Plains and into the mid-east as indicated below.  In many of these states, producers are facing the dilemma of needing two sprays – one to control early season stripe rust and another at flowering to help suppress Fusarium head blight (scab).  We faced a similar dilemma here in Oklahoma but with an early application to control early season stripe rust and then perhaps a later one to control later season foliar diseases and or scab (in eastern/north-eastern OK).  All with low wheat prices, but without the fungicide yield and quality (test weight) would be hurt as with what happened last year.

North Dakota:  Dr. Andrew Friskop (Ast Professor/Cereal Extn Pathologist); North Dakota State University; May 23, 2016:  “Stripe rust was confirmed in two counties in North Dakota on May 23. One sample was from a winter wheat research plot near Fargo (Cass County), and the other was from a winter wheat variety performance trial in southwest ND near Hettinger (Adams Co.). This is approximately 10 days ahead of when stripe rust was detected in North Dakota last year. Given the susceptibility in popular spring wheat and winter wheat varieties, growers will be encouraged to scout especially with rain and dew in the forecast.”

Ohio:  Dr. Pierce Paul (Aso Professor); Ohio State University; May 24, 2016:  “Stripe rust continues to spread across the state of Ohio. This is the most widespread and the earliest I have seen this disease in the state in 13 years. Several varieties in fields south of interstate 70 and west of interstate 71 are severely affected, with substantial damage to the flag leaf well before flowering in multiple hot spots in some field. As we approach flowering in more northern counties, the reports continue to come in. Several fields have already been sprayed for stripe rust, but the dilemma facing most growers is whether to spray for stripe rust or wait to spray for scab in fields not yet at anthesis.”

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Severe stripe rust in Ohio – Dr. Pierce Paul

South Dakota:  Dr. Emmanuel Byamukama (Ast Professor/Extn Spec – Plant Pathology); South Dakota State University; May 27, 2016:  “I scouted several winter wheat fields this week in East (Codington, Clark) , Central (Beadle, Hyde, Hand, Hughes) and West (Stanley, Jackson, Pennington) South Dakota and I found stripe rust in almost every field I scouted. The majority of these fields have stripe rust just starting while a few have moderate to severe stripe rust. Winter wheat is beginning to head and a few fields are at flowering. With more rain in the forecast, a fungicide may be necessary to manage stripe rust. The challenge is going to be needing another fungicide shortly for scab management. And with the wheat prices not encouraging, producers are concerned applying 2-3 fungicides in winter wheat this season.”

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Severe stripe rust in South Dakota – Dr. Emmanuel Byamukama

Wheat Disease Update – 19 May 2016

Article written by Dr. Bob Hunger, Extension Wheat Pathologist

Department of Entomology & Plant Pathology – 127 Noble Research Center – Oklahoma State University – Stillwater, OK

405-744-9958 (work) – bob.hunger@okstate.edu

      This past week (Monday & Tuesday) I visited the Dr. Raymond Sidwell Station near Lahoma (Major County), and the variety trials near Cherokee (Alfalfa County) and Alva (Woods County) on my way to field days in the panhandle near Balko and Hooker (Texas and Beaver Counties).  Except for in the panhandle, wheat foliage is pretty much done for in Oklahoma.  Wheat in the panhandle was mostly in the kernel forming stage.  Diseases observed on the trip to the panhandle included stripe rust (some still actively sporulating), wheat streak mosaic/high plains, and barley yellow dwarf.  Samples submitted to the Plant Disease and Insect Diagnostic Lab also have tested positive for these viruses.  As indicated in the 14-May update, take-all/root rot has been confirmed from a couple samples received from across central and northern Oklahoma.  Take-all has been confirmed, but it appears another root rot also may be involved.  Jen Olson in the PDIDL is making isolations to help resolve exactly what is involved in terms of root rot disease.  In south-central Oklahoma Aaron Henson (Tillman County Extn Educator) indicated to me that wheat is variable in maturity but he estimates that some harvesting should begin in 1.5 to 2 weeks.  Heath Sanders (Area Extn Agron Spclt located in southwestern OK) indicated much the same – especially if the cool/wet weather becomes more seasonally hot and dry.

Reports/excerpts of reports from other states:

Cereal Rust Bulletin from the Cereal Disease Lab in Minnesota; May 18, 2016:  Highlights/reports in the Cereal Rust Bulletin include:

·        Wheat stem rust was found in a nursery in south central Georgia.

·        Wheat stripe is widespread in the U.S., now reported in 24 states.

·        Oat crown rust has now been reported in Texas, Louisiana, Mississippi, Alabama and North Carolina.

The link to this report is: http://www.ars.usda.gov/SP2UserFiles/ad_hoc/36400500Cerealrustbulletins/16CRB4.pdf

Kansas:  Dr. Erick De Wolf (Extn Plant Pathologist); Kansas State University; May 18, 2016:  “Wheat in central and south central Kansas is at the grain filling stages of growth with many fields at or near the milk stages of kernel development.  Stripe rust is severe in many fields that were not treated with fungicides this year.  Fields of susceptible varieties have stripe rust severity >80% on flag leaves in demonstration plots in Pratt, Kingman, Harper, Barber counties.  The disease was also severe in Ellsworth county were a fungicide demonstration plot had nearly 100% severity of the flag leaves.   The weather this week appears highly conducive for continued disease development and the risk of severe disease appears to be high in Northwestern and West Central KS where low levels of stripe rust have been reported on the flag leaves.  Varieties with genetic resistance are performing well with disease reactions very similar to what we saw in previous years.   To date, T-158, Gallagher, WB-Grainfield, TAM 114, WB Cedar, Sy- Monument have all had moderate levels of resistance to the disease.  This suggests that the race structure of the stripe rust fungus is similar to last year.  Low levels of leaf rust were observed in Kingman, Pratt, Barber and Harper Counties.”

OSU to open new Lahoma research station facility in honor of Raymond Sidwell on May 13

LAHOMA, Okla. – The life’s work of the late Raymond Sidwell of Goltry is continuing to provide benefits to agricultural producers across the region, thanks to a new facility that bears his name at the Oklahoma State University Division of Agricultural Sciences and Natural Resources’ North Central Research Station.
OSU to open new Lahoma research station facility in honor of Raymond Sidwell on May 13

Bambi (front), Brady (left) and Brenda Sidwell gear up for the grand opening of the Dr. Raymond Sidwell Research Facility on May 13

“We can think of nothing more suitable than to have our new Dr. Raymond Sidwell Research Facility’s grand opening be part of our May 13 Wheat Field Day, as Raymond worked diligently for decades to make the annual field day one of the premier agricultural events in the Southern Plains,” said Tom Coon, OSU vice president for agricultural programs.

Sidwell served as senior station manager for the 143-acre experiment station, located in the heart of wheat production country near Lahoma, from June of 1980 until his passing in December of 2013.

“We invite everyone to join us as we honor Dr. Sidwell and showcase the importance of crop research being conducted through our statewide Oklahoma Agricultural Experiment Station system,” Coon said. “Lahoma is situated on Highway 60 just west of Enid, for those who have never been to the experiment station. Signs will be posted.”

There is no cost to attend the 2016 Wheat Field Day, which will take place from 8:30 a.m. to approximately noon. Lunch will be provided free of charge thanks to the generosity of several sponsors.

Richard Austin, current station superintendent, said the state-of-the-art Dr. Raymond Sidwell Research Facility has a conference room, offices and restrooms compliant with the Americans with Disabilities Act, and features a large open bay design that will facilitate equipment and make possible field day events unimpeded by weather.

“There is a lot of orange integrated into the building, signifying it is an OSU facility, which everyone who knew Raymond recognizes would be important to him,” Austin said.

In addition, Sidwell was known to be fond of porches, so one was incorporated into the front of the facility.

“It’s a nice touch people can enjoy, allowing those who visit the facility to be outside but out of the sun and hopefully remember what Raymond meant to Oklahoma agricultural producers and agribusinesses,” said Randy Raper, OAES assistant director.

More than three decades of Sidwell’s meticulous management of the station allowed for major research efforts in wheat breeding and variety development, soil fertility, weed science, soybean varieties and cropping systems, grain sorghum variety trials, plant pathology and entomology.

Through station educational activities such as the annual Wheat Field Day, Sidwell hosted literally thousands of guests over the years, including agricultural producers, commodity groups, foreign dignitaries, national and state legislators and numerous other officials, representatives and individuals from the public and private sectors.

“Dr. Sidwell was an important part of our Wheat Improvement Team, working to ensure wheat growers were able to take advantage of improved crop varieties and research-based best management practices,” Coon said. “He really was one of the great ambassadors of the land-grant mission, helping Oklahomans improve the quality of life for them, their families and their communities.”

The Sidwells – Raymond, his wife Brenda and their children Bambi and Brady – have long been highly regarded members of Oklahoma’s agricultural and agribusiness communities, and are recognized by their farmer peers as very progressive and proactive production agriculturalists.

An OSU agricultural economics alumnus and president of Sidwell Seed and the newly established Enterprise Grain Company located in Kremlin, Brady Sidwell said his father implemented many science-proven practices into the family operation that were backed by cutting-edge research done at the North Central Research Station under his guidance.

“Our family is both extremely proud as well as humbled to have this opportunity to honor our father in such a way,” he said. “Research and Extension programs at land-grant institutions play a critical role in Oklahoma and American agriculture.”

Sidwell added the family is grateful to be able to do their part in further promoting the work being done by the OSU Wheat Improvement Team.

“As a longstanding certified seed wheat producer, we will continue to utilize the best-in-class seed genetics being released by OSU every year and know that the new Dr. Raymond Sidwell Research Facility will only help this already well-respected program reach new heights,” he said.

For Bambi Sidwell, she always knew how passionate her father was about agriculture, in general, and wheat improvement, in particular.

“Growing up on our family farm near Goltry, our dad had an excitement about continuously improving wheat production,” she said. “He enjoyed sharing ideas with other producers that would have a significant and positive impact on people’s lives and their farming operations. Our dad was keen on maintaining a meticulously clean operation, something we strive to continue today.”

An OSU agribusiness alumna, Bambi said the family is proud to be able to take part in honoring her father in a way that enhances research and educational programs conducted at the Lahoma experiment station. Funding for the new facility was made through the Sidwell family, the Sitlington Trust and OAES.