FHB Alert Blog

FHB Update from PA, 05/21/18

Scab risk continues to be very high across PA this week. If your wheat has begun to flower, spray at your earliest opportunity to protect it from infection. Recent wet weather will cause spores to continue to form all week. Time your application on fields that are at 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 OK, 05/17/18

Although not as obvious as in previous weeks, powdery mildew is still hanging on in Oklahoma, and has even moved up onto the heads in some fields. One such field is my foliar fungicide trial here at Stillwater. Examining this trial yesterday revealed many of the lower heads were lightly to moderately infected with powdery mildew. This is one of the few times I have seen powdery mildew move onto wheat heads in Oklahoma. It is important to note that these infected heads are the ones produced on the lower tillers beneath the main, taller tillers. I did not find any powdery mildew on any of the higher heads. This appears to me to be a light to moderate infection severity, but I’ve not had a lot of experience with powdery mildew on wheat heads, so this is just my estimation. Exactly how much of an impact this powdery mildew will have on yield and test weight may be hard to determine because the level of powdery mildew on these heads seemed to be fairly constant across all treatments.

Yesterday, I also observed leaf rust on scattered leaves in the foliar fungicide trial at Stillwater (mostly in the not-sprayed control plots). Typically this was just a couple pustules scattered on a leaf. This indicates that leaf rust is starting to appear and may increase a bit over the next 7-10 days. However, this is a late infection as this trial is at late milk to early soft dough. Hence, the leaf rust will have only a minimal impact on yield even if it does increase significantly.

Finally, Brad Babek (County Educator, Washita County in southwestern Oklahoma) reported increasing areas of white heads in wheat fields. In cases where I have observed such heads this year, it has been due to dryland (Fusarium) root rot. Typically the roots will be rotted and often the lowest part of the stem is discolored (dark) and often there is a pinkish-purple color associated with the lower tiller and roots. Splitting such a tiller often reveals a stem filled with white or pinkish-white fungal growth.

--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 MD, 05/15/18

Wheat is anywhere from beginning to heading to past-flowering in Maryland. With the current wet weather, the risk of FHB is increasing in the region. Farmers who currently have their wheat flowering are advised to spray for FHB. Those who will have flowering in the coming week or so are advised to be prepared to spray, keeping a close watch on the risk forecast. If the wheat is already past flowering, you don’t need to spray. The fungicides recommended for FHB are Prosaro, Caramba, or Proline. Do not apply a strobilurin-containing fungicide.

--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 VA, 05/15/18

FHB risk is increasing in Virginia and will continue to increase over the next several days. Risk is highest on the Eastern Shore, but susceptible varieties such as Shirley that are flowering over the next week will be at moderate to high risk in many portions of the state. Growers should monitor the FHB risk tool as their wheat crop begins to flower and consider applying a fungicide if risk is moderate to high. Wheat that has completed flowering is no longer susceptible to infection. Fungicides should be applied at early flowering or up to one week later. Do not apply a strobilurin-containing fungicide since this can increase DON contamination. Recommended fungicides include Prosaro, Caramba, and Proline.

--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 OH, 05/15/18

Although the wheat crop is now flowering in some southern counties, the scab forecasting system (http://www.wheatscab.psu.edu/) indicates that the risk of head scab is low (the map is green), suggesting that conditions have not been favorable for the scab fungus to infect. However, if you still plan to spray for head scab, Prosaro or Caramba should be your fungicides of choice. The new fungicide, Miravis Ace, which seems to be just as effective as Prosaro and Caramba, based on a limited number of trials, is probably not yet available. STAY AWAY from the strobilurins when it comes to head scab management. These fungicides tend to increase rather than reduce vomitoxin contamination.

Continue to monitor the crop and the weather in the north. Barley will begin heading-out later this week and into next week, while wheat is still about a week away from heading in the north and about two to three weeks away from flowering. There is still ample time to apply a fungicide for head scab and vomitoxin control, if conditions become favorable during the next few weeks.

--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 PA, 05/14/18

If you have wheat flowering this week or barley heading this week in DelMarVa or most of Pennsylvania, please consider spraying your crop for scab if you have not done so already. Persistent wet weather and warm temperatures are triggering Medium to High risk levels in many areas of the region. Time your application on fields that are at 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 MO, 05/14/18

In Missouri, FHB risk predictions have indicated that risk of infection was low throughout this past week as wheat has begun to flower in much of the southern part of the state. However, as the humidity begins to increase and the forecast calls for intermittent rain events, the risk of FHB could increase in some areas. If a fungicide application is considered, the fungicides Prosaro and Caramba applied at Feekes 10.5.1 (50% of the plants in the field are beginning to flower) are considered the best options for FHB management. University research also has shown that the application of a fungicide up to 5 days after Feekes 10.5.1 may provide similar control. Strobilurin-containing fungicides are not labelled for control of Fusarium head blight and, if applied at later growth stages such as Feekes 10.5.1, may result in increased DON levels in the grain.

--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 VA, 05/09/18

The FHB risk for Virginia remains low in most areas. However, risk is moderate to high for wheat currently flowering in coastal areas. For FHB control in wheat, apply Prosaro, Caramba, or Proline at beginning flowering or up to one week later. For barley, fungicides should be applied at head emergence. Do not apply a strobilurin containing fungicide after the flag leaf emergence stage since this can increase DON levels in the grain.

--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 PA, 05/09/18

Wheat in lower Delaware is flowering, and barley in lower Pennsylvania is heading. If you farm in these areas, your scab infection risk is currently low, with the exception of the extreme southeast corner of Sussex County, DE. As temperatures warm and humidity increases across the region, it is likely our infection risk levels will increase. Please stay tuned to this risk tool since the crops are moving along, too. Be prepared to spray a fungicide on fields that are at 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, 05/09/18

Wheat growers in Maryland have so far been fortunate this year for having low disease pressure from leaf rust, powdery mildew and even scab!! In the south (Eastern shore), wheat is flowering currently. With consistently warmer temperatures now, a few incidences of leaf diseases are being observed. Triazole fungicides: Prosaro/ Caramba/ Proline that are the scab fungicides should provide control against these as well. Strobilurin containing fungicides should not be sprayed at this stage, as they may lead to DON accumulation in grains. Up in the north, flag leaves are emerging. No diseases being seen so far here as well. Growers should keep an eye on the FHB risk, as crop heads and flowers here in coming weeks.

--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

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