FHB Alert Blog

FHB Update from SD, 05/22/17

Some of the winter wheat in SD is starting to head. This wheat growth stage is the best time to start monitoring the risk for Fusarium head blight (FHB). The most important risk factor for FHB is rainfall when wheat is at flowering. The current predicted risk for FHB for SD is mainly low for the most parts of the state. A moderate risk is predicted for portions of Miner, Lake and McCook counties as well as southwest counties. Keep monitoring the risk for scab until wheat is done flowering. For areas predicted to have a moderate or high risk of FHB, a triazole fungicide applied at flowering is recommended.

--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 NY, 05/19/17

Winter malting barley fields in New York range from in the boot to heads fully emerged. Development is further ahead in the Hudson Valley region. Conditions have been very conducive for local spore production by the Fusarium Head Blight (FHB) fungus. The Fusarium Risk Assessment Map has shown moderate to severe risk for large areas of the state this week and through this weekend. Application of an effective triazole fungicide product, specifically Caramba or Prosaro, is recommended as soon as all of the barley heads have emerged to suppress FHB and DON production as well as to protect upper leaves from foliar diseases. Sprays up to seven days after head emergence may still result in significant disease suppression. Fungicide products containing strobilurins should not be applied to headed wheat or barley as they may result in increased levels of DON in grain. Significant levels of scald disease have been observed in some barley fields. Low levels of powdery mildew and spot blotch have been observed, though no rusts have been seen to date. This is a critical time for triazole fungicide application to winter barley and I urge close observation of crop development and weather forecasts.

Winter wheat in New York is at stem elongation to flag leaf visible stages, so flowering is still about 10-14 days ahead. Some wheat is further ahead in the Hudson Valley. 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). A flowering application of triazole fungicide should be based on Fusarium head blight (FHB) risk as well as the risks of powdery mildew, rust, and fungal leaf blotches in the upper canopy based on scouting of individual fields. We have observed low levels of powdery mildew and fungal leaf blotches but no stripe rust or leaf rust to date. 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, 05/19/17

Our scab risk continues to be quite low in PA. Wheat flowering now is not very threatened by head scab. Rains early next week may drive our risk up, so continue to check the forecasting site regularly. Recent hot temperatures and sunny days have compressed the heading/flowering window for wheat, so your crop may be further along than you think. 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.

--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 MD, 05/19/17

Wheat is Maryland is now in the grain filling stage. With the showers that we had at flowering, there are high chances of substantial Fusarium Head Blight incidences. Consequently, tombstones (shriveled scabby kernels) and DON content are going to be a concern for the growers. To assess the incidence of FHB, you may randomly pick 20-25 heads of wheat per 1-2 acres and count the spikes having bleached spikelets. Harvesting from fields with high levels of FHB incidence should be done with higher fan speeds to remove lighter tombstone kernels. The farmers are advised to get the DON content analyzed in the grain before taking it to the market.

--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 MD, 05/19/17

Wheat is Maryland is now in the grain filling stage. With the showers that we had at flowering, there are high chances of substantial Fusarium Head Blight incidences. Consequently, tombstones (shriveled scabby kernels) and DON content are going to be a concern for the growers. To assess the incidence of FHB, you may randomly pick 20-25 heads of wheat per 1-2 acres and count the spikes having bleached spikelets. Harvesting from fields with high levels of FHB incidence should be done with higher fan speeds to remove lighter tombstone kernels. The farmers are advised to get the DON content analyzed in the grain before taking it to the market.

--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 DE, 05/15/17

We are through flowering in Delaware and Maryland wheat. Growers should assess wheat for FHB severity approximately 18-24 days after flowering or fungicide application. Check one transect per 1-2 acres of field. At each transect, pick 25 heads without looking at the field. Mark the number of heads with FHB out of the total heads collected (FHB incidence). Fields with high levels of FHB incidence should be harvested with increased fan speeds to remove tombstones and grain stored separately from that harvested from cleaner fields. If possible, harvest fields early and dry to at least 15% moisture to prevent continued growth of the FHB fungus and potential mycotoxin production.

--Nathan Kleczewski, Extension Field Crop Plant Pathologist, University of Delaware

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, 05/12/17

Drying conditions and cool temperatures across the state over the next few days will keep our scab risk low in PA. Wheat flowering now is not very threatened by head scab. Check back early next week as temperatures rise, and we perhaps have humid conditions to see if risk is increasing. 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.

--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 OH, 05/08/17

Head scab and vomitoxin become our biggest concerns at this time of the wheat season. For wheat flowering today, May 8, the risk of scab is low across most of the state (the map is green), but moderate in parts of the west (yellow areas close to the Indiana border). The risk is also moderate-high in the northeast corner if the state, but the wheat in that region is not yet flowering. Several fields across Southern and Central Ohio will reach anthesis during this week. The risk will likely remain low if it stays cold, in spite of the rains, but continue to keep your eyes on the weather and the scab forecasting and alert systems over the next few weeks, and be prepared to apply a fungicide (Prosaro or Caramba at full label-recommended rates) at flowering if the risk increases.

--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 US, 05/06/17

Welcome to the Fusarium Head Blight Prediction Center. The current focus of the prediction models is on wheat central KS, MO, IL, southern IN and OH as well as DE and MD where the wheat is approaching or already at the flowering growth stages that are most vulnerable to Fusarium infection. The risk of disease is currently low for much of KS and MO; however, there is a moderate or high risk for some areas of IL, IN, DE and MD. Growers in this area should check with their local extension specialists or crop consultants for additional evaluations of disease risk.

--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, 05/06/17

Wheat in the central portion of Kansas is now at flowering stages of growth that are most vulnerable to Fusarium head blight. The risk models currently indicate a low to moderate risk of disease for most of this area. The weather forecast indicates we are about to enter a period with higher temps and multiple days without rain. This should keep the risk of severe disease in central Kansas low for much of this critical period.

--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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