FHB Alert Blog

FHB Update from US, 06/20/17

Welcome to the Fusarium head blight predictions center. The focus of the prediction effort is currently on the norther hard red spring wheat in ND, MN and SD where the wheat crop is at or approaching the flowering stages of growth that are most vulnerable to fusarium head blight.. Be sure to select state you are most interested in from the menu to the left of the risk map. This will also you to zoom in to see more details of the map and read 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 ND, 06/20/17

Spring wheat along I-94 is heading with some of the crop flowering. Spring wheat in the northern tier of the state is in late-tillering to flag leaf stage. A moderate to high scab risk exists for flowering in northeast ND (Cavalier, Towner and Rolette County) and this risk will likely persist for several days. Other areas of the state that received significant rainfall in the past seven days will likely see an elevated scab risk in the upcoming days. Continue to monitor the growth stage of the small grain crop.

--Andrew Friskop, Cereal Extension Pathologist, NDSU Department of Plant Pathology

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 ND, 06/13/17

Winter wheat is flowering and some of the earliest planted spring wheat is starting to head. Fusarium head blight risk for the state is low and is likely attributed to the dry weather most of the state has been experiencing. In the past few days, several rain events have occurred in the state and more are projected in the upcoming days. If areas of the state have several days of prolonged moisture and high humidity, scab risk will likely increase. Continue to monitor the growth stage in wheat and use the model to estimate scab risk.

--Andrew Friskop, Cereal Extension Pathologist, NDSU Department of Plant Pathology

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 SD, 06/13/17

Some of the winter wheat in SD is past flowering growth stage. This means the risk for Fusarium head blight is low. Moreover, current FHB prediction tool shows low risk for the entire state. This is mainly due to the dry weather we have had the past few weeks. Although rains came through the last two days, we need to accumulate several days of favorable weather for the FHB risk to change. Late planted winter wheat that has not flowered yet may still be at risk. Keep watching the weather and the FHB prediction tool until wheat is done flowering.

--Emmanuel Byamukama, Extension Plant Pathologist , South Dakota 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 SD, 06/05/17

Winter wheat in SD has started flowering. This is the critical stage when Fusarium head blight (FHB) starts to develop. Currently, the FHB prediction tool shows low risk for FHB across the entire state. This is due to the dry conditions we are experiencing. Continue to watch the weather and check on this prediction tool to assess the need for a triazole fungicide until wheat is done flowering.

--Emmanuel Byamukama, Extension Plant Pathologist , South Dakota 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 WI, 06/02/17

Many winter wheat varieties in Wisconsin are headed out and at, or will be at, anthesis (flowering) this weekend. Currently, the Fusarium Head Blight Prediction Center is ranking much of the primary winter wheat growing area of Wisconsin at medium risk with many pockets of high risk for FHB on susceptible varieties. Warm temperatures and the threat of rain this weekend will make conditions further favorable for FHB. In addition, stripe rust is quickly increasing in many fields on susceptible varieties. I have observed 20% stripe rust severity on flag leaves in several fields with high incidence across those fields. The primary fungicides for control of FHB are Caramba and Prosaro. These same products are rated as “excellent” on stripe rust. I would urge you to verify anthesis has begun in your field before applying either product. We have observed poor control of FHB where application of these effective fungicides was made before anthesis. In fact, we have observed improved control of FHB and lower levels of DON in finished grain where fungicide application was delayed 4-5 days after the beginning of anthesis, compared to applications at the start of anthesis. Also, remember that application of fungicides should be made no later than 6-7 days after the start of anthesis. After this time, fungicide efficacy on FHB is much reduced. Finally, DO NOT use any fungicide products that contain a strobilurin fungicide after the "boot" stage in wheat. Some studies have demonstrated that using strobilurin fungicides at, or after heading, can result in increased vomitoxin (DON) levels in finished grain. Get out there and SCOUT, SCOUT, SCOUT!

--Damon Smith, Extension Plant Pathologist, University of Wisconsin

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, 06/02/17

The risk of Fusarium head blight and DON contamination is moderate to severe for winter wheat flowering in much of New York at this time. General rains are expected again on Sunday. The triazole products Caramba and Prosaro are the most effective fungicides for suppression of FHB and DON contamination when applied at flowering (emergence of anthers on heads). There is an application window of approximately 7 days from the beginning of flowering in which reasonable FHB suppression can be expected. 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. Each has been observed in certain fields. Consider especially the regional risk of stripe rust as it is beginning to be observed in diverse areas of western New York and we continue to have conducive conditions for stripe rust infection. Fungicide products containing strobilurins should not be applied to headed wheat or barley as they may result in increased levels of DON in grain. 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.

Winter malting barley fields are at grain filling stages now and beyond the timing for foliar fungicide application. Spring malting barley fields are mostly at tillering stages now.

Integrated management of wheat and malting barley diseases will be discussed at Cornell's Small Grains Management Field Day at the Musgrave Research Farm on June 8 (http://events.cornell.edu/event/small_grains_management_field_day_4909 ).

--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 ND, 06/02/17

Some of the winter wheat will be heading out in the next couple days. The future weather forecast indicates warm and dry conditions with sporadic rain events across the state. Currently, scab risk for the entire state is low. As the winter wheat crop approaches flowering, use the Fusarium head blight (scab) model to help assess risk in specific growing regions.

--Andrew Friskop, Cereal Extension Pathologist, NDSU Department of Plant Pathology

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, 05/31/17

If you have wheat flowering now, or set to flower in the next week, consider a spray for scab prevention. Throughout PA we have been experiencing “Low” risk for the development of scab in wheat and barley…until now. Much of the southern part of PA as well as central areas are going to be increasing in risk level over the next several days. If you have wheat beginning to flower in the next few weeks, keep watching the model: you will probably want to spray.

If you choose to spray your wheat, you can do so from the beginning of flowering up to about 5 days following the beginning of flowering. Remember, sprays applied PRIOR to flowering will NOT provide significant suppression of scab or toxin production. Caramba or Prosaro are effective on scab and give control of most leaf diseases and glume blotch. They do not need to be tank mixed with another product to control these diseases. If these products are unavailable, Proline and Folicur (which together provide the same chemicals as Prosaro) may be tank mixed at a rate of 3 + 3 fl oz/A. Spray nozzles should be angled at 30° down from horizontal, toward the grain heads, using forward- and backward mounted nozzles or nozzles with a two directional spray, such as Twinjet nozzles. Do NOT use any strobilurin-containing fungicides at heading or beyond.

Wheat in the southern parts of PA may now be showing symptoms if it was infected at flowering. Look for portions of the head to be bleached white instead of a healthy green. Having an idea of how much of your crop is affected will be important as you make harvest decisions in the next several weeks.

--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 SD, 05/29/17

Most of the winter wheat in South Dakota is at heading. In the next few days, winter wheat will be flowering. Growers need to watch the weather and plan a fungicide to protect winter wheat against Fusarium head blight (FHB). According to the Fusarium head blight risk tool, the current risk for FHB is moderate to high for the Eastern-most counties and a few southern areas. These areas have had several rainy days, therefore, an elevated level of FHB risk. The central and west areas have been relatively dry, hence the low risk for FHB. The best fungicide timing for FHB management is at flowering (when at least 50% of the spikes are flowering). The two fungicides that are effective against FHB are Prosaro and Caramba. These fungicides are also effective against stripe rust and other fungal leaf spot diseases.

--Emmanuel Byamukama, Extension Plant Pathologist , South Dakota 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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