FHB Alert Blog

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

FHB Update from WI, 05/28/17

We are quickly approaching head emergence and anthesis on many varieties in the state of Wisconsin. I predict that anthesis (flowering) will take place within the next week or so in Wisconsin. Farmers should focus on making a decision on fungicide application to control Fusarium head blight (FHB or scab). At this point, I think farmers should hold off on a fungicide application specifically for stripe rust. The major focus for fungicide application on winter wheat in Wisconsin should shift to managing FHB. With this said, the two primary products that have performed well in Wisconsin for FHB, also perform well on stripe rust and are ranked excellent in the Small Grains Fungicide Efficacy Table. This means that spraying for FHB will also control stripe rust, as long as the stripe rust epidemic has not advanced to high levels on the flag leaves. Currently, the Fusarium Head Blight Prediction Center is ranking much of the primary winter wheat growing area of Wisconsin at medium to high risk for FHB on susceptible varieties. Plenty or rain and adequate temperatures are making conditions ripe for FHB in the major wheat production area of the state.

The next 7-10 days poses a critical time to make a decision for fungicide application to control FHB and stripe rust. The primary fungicides for control of FHB are Caramba and Prosaro. I would urge you to wait until anthesis has begun in your field before applying. 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, 05/26/17

Most winter malting barley fields in New York have headed out and the remainder will do so this week. Foliar sprays of Caramba or Prosaro up to seven days after head emergence may still result in significant FHB and DON 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. A heads emerged spray with these triazole fungicides also helps protect upper leaves against fungal leaf blotches, powdery mildew, and rust. Even though we have had frequent rains, the Fusarium Risk Assessment Map shows mostly low risk of Fusarium infection in New York because temperatures have been considered too low for spore production.

This is a critical week ahead for fungicide spray decisions on winter wheat. Winter wheat in New York varies from boot stage to the initiation of flowering. 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, rusts, 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. We confirmed the first
stripe rust of the season today on winter wheat in Yates Co.! Foci were fairly large with severe rust in the lower canopy spreading to upper leaves, suggesting a number of rust reproduction cycles in these fields and possible local overwintering of the rust. 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 MI, 05/26/17

As of May 26, wheat is flowering in southern MI and heads will soon emerge in the central region.. The prediction model for scab suggests the risk of scab on currently flowering wheat is relatively low, but growers are encouraged to visit this site repeatedly as the forecast can change rather quickly.

When contemplating the use of a fungicide for wheat In MI, growers are encouraged to consider the potential benefit of reducing the risk of scab infections as well as reducing loses to grain yield by leaf diseases. To date, the level of leaf diseases (powdery mildew, leaf spots and rusts) have been kept in check by weather conditions, but this is likely to change if high precipitation rates persist and temperatures become more moderate. Knowing one’s variety is key, especially with soft red varieties, as there are considerable differences in susceptibility to both leaf diseases and scab within popular varieties. Caramba and Prosaro remain the fungicides of choice for suppressing scab and leaf diseases. The window of application generally begins when most of the dominate stems have begun to flower (have exposed anthers). The window usually extends for about 5 to 7 days beyond this point depending on ambient temperatures.

Questions can be directed to Martin Chilvers (chilvers@msu.edu) or Martin Nagelkirk (nagelkir@msu.edu; 810-404-3400)

--Martin Nagelkirk, Extension Educator, Michigan 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, 05/25/17

The wheat in southeast and south central Kansas is at the late milk and dough stages of kernel development. The symptoms of Fusarium head blight (head scab) are most evident at these growth stages and it is important for growers to be out looking for disease this week. Symptoms will soon be masked by natural maturity of the crop.

--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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