FHB Alert Blog

FHB Update from TN, 04/26/18

The wet weather in Tennessee are conducive for spore production. If wet and moderately warm temperatures continue into flowering, wheat will be at increased risk for FHB infection and fungicide application would be recommended. Best fungicide timing is at initial bloom/flowering (Feekes 10.5.1), which relates to at least 50% of the heads blooming in a field. Although applications made 5 to 6 days after initial bloom can also provide a benefit in reducing FHB and mycotoxin levels.

Only fungicide products that are solo triazoles (FRAC or fungicide group 3 on the label) should be applied for prevention/management of Head Scab. Products that contain a strobilurin can increase the mycotoxin levels in FHB infected wheat. The best products currently available for reducing Scab symptoms and DON levels are Caramba and Prosaro. A more comprehension fungicide table can be found at UTcrops.com (Wheat fungicide Table).

--Heather Young-Kelly, Extension Plant Pathologist, University of Tennessee

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, 04/26/18

Although reports of powdery mildew continue to come in from around the state, perhaps the more important news is that other foliar diseases have started to become active. On Apr-24, Septoria tritici blotch (Figure 1) was prevalent on lower leaves throughout the variety trial near Walters, OK. Walters is located in southwestern Oklahoma about 20 miles south of Lawton & 10 miles north of the Texas border. Although interesting, Septoria tritici blotch is not the disease of concern as in this trial there also was active leaf rust on lower leaves (Figure 2) and stripe rust on the leaves just below the flag leaf. Dr. Brett Carver (OSU Professor/Wheat Breeder) and Branden Watson (OSU PaSS Graduate Student) also reported active stripe rust at various levels in trials located near Chickasha, OK in central Oklahoma (Figure 3). The photo from Dr. Carver (the right photo in Figure 3) shows much more severe stripe rust than was seen near Walters. These observations indicate that both stripe and leaf rust are increasing through southern and central Oklahoma. This activity will increase through the coming weeks as the forecast indicates continued moisture (rains and dew) coupled with moderate temperature. Wheat in southern Oklahoma was approaching or was actively flowering, so the option of using a fungicide to protect yield potential either is at hand or may be too late. Most fungicides labeled for wheat rust control must be applied by the start of flowering (Feekes’ growth stage 10.5). The only fungicides I know of that have a label allowing for a later application are Tilt, Quilt Xcel, and Trivapro, which can be applied up to Feekes’ 10.5.4 (end of flowering with the kernel watery ripe). In addition to these application deadlines, there often are required pre-harvest intervals so you must allow for a specific number of days to elapse between application of the fungicide and harvest. For specific information, please consult the label for the fungicide.

--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 KS, 04/25/18

Wheat in southeast Kansas will likely reach the heading and flowering stages of growth that are most vulnerable to infection by the Fusarium fungus over the next 7 to 10 days. The risk maps currently indicate the risk of severe head blight is low because of dry conditions in early April. The risk of disease may increase rapidly over the next week as rain moves through the area.

--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 US, 04/25/18

Welcome to the Fusarium head blight prediction center. This site provides daily estimates of disease risk for many of the areas of the US where head blight is a problem. The current focus of the prediction effort is on AR, MO, TN, KY and NC. Wheat in these states are at growth stages that are most vulnerable to Fusarium infection or will likely reach these stages in the next 7 -10 days. The current risk maps indicate a low risk of disease because of dry weather in early April. The risk may increase over the next week as rain moves through some areas of the central US.

--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 PA, 04/24/18

Currently, PA and most of Delaware are at a “low” risk of scab development because it has been so cool. The exception is the lower eastern portion of Sussex County, DE which is just now starting to experience weather conditions that nudge it into "medium" risk territory. While most of the wheat in PA is too young to worry about scab right now, those of you wishing to apply a fungicide along with your growth regulator spray should scout for powdery mildew before doing so. We generally recommend only spraying for this disease if 5-10% of the fully expanded upper leaves are infected, and because it has been so cool, your wheat will probably not meet this threshold. Those of you in Delaware are closer to heading, and if you are growing barley, you may already be there. Keep a close watch on the FHB Risk Assessment Tool as warmer temperatures and humidity may push your risk higher over the next week. If you decide to spray your barley, target your Caramba or Prosaro application at heading. For wheat, wait until early flowering for your applications.

--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 NC, 04/23/18

For wheat flowering now, scab risk is low across North Carolina due to recent dry weather. Rain predicted for April 23-28 will make conditions more conducive to scab for wheat flowering in the coming 10 days. However, considering the amount of moisture predicted, risk for wheat flowering later this week and next week will likely remain low in most of North Carolina, with the likely exception being the Tidewater area. If your wheat is flowering in the next 2 weeks, monitor scab risk closely, especially if you have susceptible varieties.

Do not apply a strobilurin-containing fungicide after flag leaf stage. For scab, the most effective products are Caramba, Prosaro, and Proline. Aerial application may be profitable. For ground application, rear- and forward-facing nozzles should be angled down 30 degrees from horizontal.

--Christina Cowger, Plant Pathologist, USDA-ARS and North Carolina 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, 04/20/18

Wheat in southern Maryland is either at jointing or booting stage, and should be heading out in a week or so. Even with the recent showers, the FHB risk is currently predicted to be low because of the cold temperatures so far. However, the temperatures are going to increase by next week, so growers are advised to keep an eye on the FHB risk forecasts. Up in the north in Frederick, Harford and nearby counties, plants are starting to joint, and are not at a stage prone for FHB.

--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 AL, 04/20/18

While moisture levels remain adequate due to periodic heavy showers, the following fronts have brought dry and unusually cool weather patterns, which are not conductive to foliar disease development. Overall, scab threat across Alabama is low and is not expected to change until the week of April 22 when several days of rain are forecast. Wheat in South and probably Central AL is past flowering and is not vulnerable to scab. Wheat in North AL has not yet flowered or is in full flower and may be vulnerable to scab early next week. Activity of other foliar diseases in North AL is very low with only some Septoria leaf spot and glume blotch being seen in breeding line trials at the Tennessee Valley Research and Extension Center. Overall, it's a low disease year in Alabama wheat.

--Austin Hagan, Extension Plant Pathologist, Auburn 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 VA, 04/19/18

Currently the wheat crop in Virginia is near flag leaf emergence, and flowering will start within a couple of weeks. As flowering begins, be sure to monitor the FHB risk in your area. Currently, most of Virginia has low risk for FHB infection. The exception is the Eastern Shore where risk is moderate to high in many areas, especially on susceptible varieties such as Shirley.

--Hillary Mehl, Extension Plant Pathologist, Virginia Tech

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 NC, 04/16/18

Wheat scab risk is moderate to high for wheat flowering now in coastal NC counties. These include south Columbus, Carteret, Pamlico, east Craven, southeast Beaufort. Wheat is likely at earlier growth stages in coastal counties north of those. Risk remains low for the Coastal Plain and other regions of the state. If risk in your area is moderate to high and wheat is flowering, apply fungicide at early flowering or up to 7 days later. Do not apply a strobilurin-containing fungicide. The most effective products are Caramba, Prosaro, and Proline. Aerial application may be profitable. For ground application, rear- and forward-facing nozzles should be angled down 30 degrees from horizontal.

--Christina Cowger, Plant Pathologist, USDA-ARS and North Carolina 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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