FHB Alert Blog

FHB Update from MO, 05/24/19

Model predictions for FHB risk have been reduced greatly over the past week. Many wheat varieties have finished or are finishing flowering in the southern part of the state. For the northern and central wheat growing areas of the state, some pockets of moderate to high FHB risk are predicted for moderately susceptible and susceptible varieties if approaching flowering in the coming days. Monitor fields for potential flowering date to determine if or when a fungicide application may be warranted. Fungicides in the triazole class such as Prosaro or Caramba are most effective when applied at 50% flowering, or Feekes 10.5.1 (50% of heads are flowering) but can be applied up to 5 days after flowering and still provide similar control. Strobilurin-containing fungicides are NOT labeled for the control of FHB and may result in increased DON levels in the grain. It is important to always follow harvest restrictions and label instructions when applying fungicides.

--Kaitlyn Bissonnette, Extension Plant Pathologist, University of Missouri

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from NY, 05/22/19

Some winter malting barley in New York is beginning to emerge from the boot and this is a critical time to consider a fungicide application. The Fusarium Risk Assessment Map (http://www.wheatscab.psu.edu/riskTool.html) indicates a moderate to high risk of Fusarium head blight (FHB) for several areas of New York. Maximal suppression of FHB and grain contamination by deoxynivalenol (DON) mycotoxin results when fully emerged heads of winter malting barley are sprayed with full label rates of Caramba or Prosaro fungicides. A heads emerged spray with these triazole fungicides also helps protect upper leaves against fungal leaf blotches, powdery mildew, and rust. Foliar sprays of Caramba or Prosaro up to seven days after head emergence may still result in significant FHB and DON suppression. Unfortunately, Miravis Ace, a new fungicide product with activity against FHB, will not receive NYSDEC label approval in time for use on small grain crops this season. Fungicide products containing strobilurins should not be applied to headed wheat or barley as they may result in increased levels of DON in grain.

Winter wheat is generally a week or more behind in development from winter barley planted on the same fall date. Winter wheat in New York varies from stem elongation to flag leaf visible stages. We should reach the critical fungicide application window for winter wheat over the next two weeks. The triazole products Caramba and Prosaro are the most effective fungicides for suppression of FHB and DON contamination when applied at flowering (emergence of yellow anthers on heads). A flowering application of triazole fungicide should be based on Fusarium head blight (FHB) risk as well as the risks of powdery mildew, rusts, and fungal leaf blotches in the upper canopy based on scouting of individual fields. There is an application window of approximately 7 days from the beginning of flowering in which reasonable FHB suppression can be expected. Check the Fusarium Risk Assessment Tool (http://www.wheatscab.psu.edu/) and your local weather forecast frequently as your winter wheat crop approaches heading and flowering.

--Gary Bergstrom, Extension Plant Pathologist, Cornell University

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from PA, 05/21/19

With many fields flowering now across the state, infection risk remains high in several areas. Scattered showers and storms over the weekend kept moisture levels up in localized regions. If a spray window presents itself, fungicide is advised.

--Alyssa Collins, Extension Field Crops Pathologist, Penn State University

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from IL, 05/21/19

Wheat is starting to flower as we approach the central portion of the state or will likely start doing so by the end of the week. Recent rains have resulted in elevated risk levels for the wheat that has flowered over the weekend, and forecasted storms moving through Illinois may continue to keep the risk level elevated for those fields that flower over the week. If considering a fungicide application, remember that replicated university research indicates that regardless of product, fungicides applied between flowering (FGS 10.5.1) and roughly 6 days past this point provide the greatest suppression of FHB. Recommended products include Caramba, Miravis Ace, Prosaro, and Proline. As usual, make sure to follow label guidelines for application. Those in the south who flowered roughly 2 weeks ago should start to see symptoms of FHB starting around this time next week if infections occurred.

--Nathan Kleczewski, Research Assistant Professor and Extension Specialist, University of Illinois

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from OH, 05/20/19

In northern Ohio, most of the wheat fields are between Feekes growth stages 9 (full flag leaf emergence) and 10 (boot), with the odd early-planted field or field planted with an early- maturing variety beginning to head-out. In southern Ohio, fields are between Feekes 10 and early flowering (Feekes 10.5.1). For those fields of wheat at flowering and fields of barley heading-out today (May 20), the risk for head scab is moderate to low. However, persistent rainfall and warmer temperatures over the next few days will likely cause the risk to increase as more fields reach anthesis later this week and early next week. But remember, scab risk is also linked to crop development; fields of wheat that are not yet at the flowering growth stage and field of barley that at not yet at the heading growth stage are at low risk for head scab. Continue to keep your eyes on crop development, the weather, and the forecasting system, and be prepared to apply a fungicide if warm, wet conditions coincide with flowering and early grain fill. Prosaro, Caramba, and Miravis Ace are the most effective fungicides for head scab and vomitoxin management, and you will have a 4-6-day window from the day the crop reaches the critical growth stage (heading for barley and flowering for wheat) to make an application. Do remember to stay away from the strobilurin fungicides when the risk for scab is high, as this group of fungicides has been linked to higher grain contamination with vomitoxin.

--Pierce Paul, Extension Plant Pathologist, Ohio State University

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from MD, 05/20/19

Wheat in the North-western counties (Frederick, Howard, Carroll, Harford counties) of the state is flowering currently. The FHB risk across the state continues to be high, so if your wheat is flowering, it’s recommended to spray fungicides for managing FHB. The best stage for spraying fungicides is early flowering or within 4-5 days of that. The fungicides effective for FHB are Prosaro/ Caramba/ Miravis-Ace. All of these fungicides are pre-mixed and do not need to be tank mixed with any other product for spraying. Read the label carefully for recommended rates and harvest restriction times. Strobilurin containing fungicides should not be sprayed at this stage. Aerial application at a rate of 5 gallons per acre or ground application at 15 gallons per acre with 300-350 um droplet size is recommended. Spray nozzles should be angled at 30°-45° down from horizontal, toward the grain heads, using forward- and backward mounted nozzles or nozzles with a two directional spray, such as Twinjet nozzles. Wheat in the Eastern shore is already past the stage for both FHB infection and fungicide spray.

--Nidhi Rawat, Small grains Pathologist, University of Maryland

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from PA, 05/17/19

Despite a window of lovely weather Friday, infection risk remains high across PA. Please monitor your crop development and consider a fungicide at flowering.

--Alyssa Collins, Extension Field Crops Pathologist, Penn State University

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from OK, 05/16/19

I started this past week on Monday (13-May) at the variety trial at Chickasha, OK, where wheat was mostly full kernel watery to milky. Stripe rust was the most prevalent foliar disease, but overall was not extremely heavy in the variety trial. Septoria/Stagonospora was a close second to stripe rust, and actually was more widespread than stripe rust but for the most part was only on the lower and mid leaves. Leaf rust also was present, but overall seemed less than stripe rust. From Chickasha, I moved to Tipton, OK in southwestern OK where the wheat was mostly about soft dough. Leaves here were quickly turning and showed a combination of stripe rust, leaf rust, and Septoria/Stagonospora. However, varieties and lines with good resistance stood out. On Tuesday (14-May), I was at the field day near El Reno in central OK (25 miles west and a bit south of OKC). Wheat here was at the end of flowering to full kernel-watery. Overall diseases were light with Septoria/Stagonospora on lower and mid leaves and some stripe and leaf rust on upper leaves. Powdery mildew also was present, but mostly only on certain varieties. Next, a demonstration was visited near Minco, OK (about 20 miles west). This demo was planted quite late (early December), and was mostly at flowering. The foliar disease situation was basically the same, that is, some stripe and leaf rust along with some powdery mildew and Septoria/Stagonospora.

From Minco, I moved north to the variety trial at Kingfisher, OK (30 miles NW of OKC). The explosion of leaf rust at Kingfisher was impressive, and finally fit with my expectations for the occurrence of leaf rust this year.

Finally, there may be some additional diseases to watch for this year given the extended cool and wet spring. This includes several diseases, but primarily bacterial streak (black chaff) and Fusarium head blight (head scab). Dr. John Fenderson (Technical Product Manager; Bayer Crop Science-WestBred) indicated on 9-May that he observed major infections of bacterial streak across central Texas. Dr. Brett Carver (OSU Wheat Breeder) also indicated seeing symptoms consistent with bacterial streak at the field day near Okmulgee in eastern OK earlier this week. Symptoms of bacterial streak are somewhat similar to Septoria/Stagonospora, and could be overlooked if both are present. However, the head symptoms should be more discernable, and currently I have not seen symptoms such as this across central and western OK.

Fusarium head blight typically occurs in eastern/northeastern OK every year, and this spring has been favorable for this disease. Wheat heads will be totally or partially bleached and contain shriveled and often pinkish or salmon colored seed. To get more information on head scab, see OSU PSS-2145 (Fusarium Head Blight (Head Scab) of Wheat: Questions and Answers – available at http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-6307/PSS-2145...) and OSU PSS-2136 (Considerations when Rotating Wheat behind Corn – available at http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-5436/PSS-2136...). Another outstanding resource regarding Fusarium head blight is the “Fusarium Head Blight Prediction Center” at http://www.wheatscab.psu.edu/. At this site there are resources describing the disease as well an assessment tool that can be used to help predict when spraying is critical to help prevent Fusarium head blight.

--Bob Hunger, Extension Plant Pathologist, Oklahoma State University

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from US, 05/16/19

There is a large area of the Mid. West that is at moderate and high risk for Fusarium head blight. Local reports from this area indicate that wheat is at or approaching growth stages that are most vulnerable to disease in the central regions of KS, MO, IL, Southern IN and OH. Parts of MD and DE may also be at risk. Producers in these areas should monitor the weather conditions carefully and consult with local extension experts or consultants for more informaton. Fungicide applications may be needed to suppress disease in these areas. Selecting the state of interest from the menu to the left of the map will zoom to show more detail and display commentary from local disease specialists.

--Erick DeWolf, Extension Plant Pathologist, Kansas State University

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

FHB Update from KS, 05/16/19

Wheat in south central and central Kansas is at heading and flowering stages of development. Wheat in north central KS is now moving through the boot and heading stages of growth and will likely reach the critical growth stages in 5-7 days. The model is indicating moderate or high risk of severe disease as we move into the most vulnerable period of growth. The risk is likely to persist or increase if forecasts for rainfall and extended periods of high relative humidity develop as expected. Growers in central Kansas should be monitoring the situation carefully and planning to apply a fungicide if weather conditions remain favorable. Care should be taken to select an effective fungicide for management of FHB with Prosaro, Caramba and Miravis Ace.

--Erick DeWolf, Extension Plant Pathologist, Kansas State University

For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu

For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org

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