Northern SWW Region's blog

FHB Update from NY, 06/15/20

Most winter wheat fields and nearly all winter barley fields in New York are now past flowering stages and beyond the period for effective fungicide application. There was a predicted, medium to high risk of FHB infection of susceptible winter cereal varieties that flowered in early June in certain areas of the state. Growers are advised to scout their crops over the next few weeks (ideally at kernel soft dough stages) for symptoms of Fusarium head blight in order to assess the likelihood of deoxynivalenol contamination in grain and to plan their harvest strategies and post-harvest marketing of grain. Foliar diseases generally have occurred at minor severities to date. Stripe rust has not been observed beyond individual wheat fields in Seneca and Wayne Counties.

Spring malting barley is progressing rapidly through growth stages with many fields approaching flag leaf emergence, and some fields of ‘Conlon’ barley in the Hudson Valley already emerging from the boot. Spring barley growers are urged to track growth stage closely and to consider a spray with Caramba, Prosaro, or Miravis Ace as soon as most heads are fully emerged (up to 7 days beyond head emergence if necessary). Application of these fungicide products 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. Low levels of barley leaf rust have been observed in winter barley and could be a bigger factor in spring barley if moist, humid conditions occur over the next few weeks. Fungicide products containing QoI (FRAC Group 11) fungicides should not be applied to headed 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 through the head emergence period for spring cereals.

-- 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 NY, 06/03/20

The Fusarium Risk Assessment Map (http://www.wheatscab.psu.edu/ ) today indicates a moderate to high risk of Fusarium head blight (FHB) for some areas of New York. Winter wheat has begun flowering (anthesis) in New York and this is critical timing for fungicide application to suppress FHB and deoxynivalenol (DON) mycotoxin accumulation in grain. The DMI (FRAC Group 3) containing fungicides Caramba, Prosaro, or Miravis Ace (latter includes a FRAC Group 7 fungicide) are the most effective fungicides for suppression of FHB and DON contamination when applied at flowering (emergence of yellow anthers on heads). A flowering application of these fungicide products 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. There is an application window of approximately 7 days from the beginning of flowering in which reasonable FHB and DON suppression can be expected. Stagonospora nodorum blotch, Septoria tritici blotch, and powdery mildew have been observed. The first occurrence of stripe rust this season was confirmed this week in Seneca Co. (https://wheat.agpestmonitor.org/stripe-rust/ ), and widespread scouting for stripe rust is warranted now! The fungicides recommended for FHB suppression are effective in protecting flag leaves against stripe rust. Fungicide products containing QoI (FRAC Group 11) fungicides 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 over the next week.

Most winter malting barley in New York is now past flowering stages and the window for effective fungicide application. Winter barley should be monitored over the next few weeks for symptoms and signs of FHB and other diseases. Scald and low levels of barley leaf rust, spot blotch, and powdery mildew have been observed. Spring malting barley varies in growth stage according to planting date but some fields in New York are now at jointing stages.

-- 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 WI, 06/02/20

Winter wheat in Wisconsin is moving through growth stages very rapidly over the past week due to ample moisture and heat. I have visited several fields this week with heads emerging or almost completely emerged. Anthesis (flowering) will begin in many winter wheat fields this week, if it hasn’t already started. With the start of anthesis comes the critical time to consider a fungicide application for Fusarium head blight (FHB or scab). The Fusarium Risk Tool is showing very favorable conditions for the major wheat producing areas of Wisconsin, for susceptible varieties (Fig. 1). Risk is also medium-to-high in these zones for moderately susceptible varieties. Given the heat and high humidity with the multiple chances of rain predicted, a fungicide application may be warranted at this time in your winter wheat fields, especially if you have susceptible varieties. To read the rest of the update click this link: https://badgercropdoc.com/2020/06/02/wisconsin-winter-wheat-disease-upda...

--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 WI, 05/27/20

Winter wheat in Wisconsin has responded to above average temperatures and rainfall, rapidly advancing through growth stages. In just a week or so, mainstems have rapidly elongated. In some varieties in southern and south-central Wisconsin, flag leaves are fully out. While now is a good time to consider a fungicide application, foliar disease has been non-existent in fields we have been in. We are monitoring the stripe rust situation carefully, and while it is active in states to our south, we have not observed any in fields we have scouted. The above average heat will also keep stripe rust moving slowly, especially in varieties with moderate resistance. So for now, I think we can hold off on fungicide. With margins being tight, I think it is wise to keep our fungicide application for Fusarium head blight (FHB or scab). Fungicides directed toward FHB are also effective against stripe rust, should it move in later in the season. Continue to scout fields between now and head emergence to catch any foliar diseases that might emerge. If interested in reading the rest of this update, click here: https://badgercropdoc.com/2020/05/27/wisconsin-winter-wheat-disease-upda....

--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, 05/22/20

Winter malting barley in much of New York is emerging from the boot and this is a critical time to consider a fungicide application. The Fusarium Risk Assessment Map (http://www.wheatscab.psu.edu/ ) today indicates a moderate to high risk of Fusarium head blight (FHB) for some areas of New York. Rain showers and thunderstorms are in local forecasts over the next week; duration of leaf/head wetness is more important for FHB development than is the amount of precipitation. Maximal suppression of FHB and grain contamination by deoxynivalenol (DON) mycotoxin results when fully emerged heads of winter malting barley are sprayed with DMI (FRAC Group 3) containing fungicides Caramba, Prosaro, or Miravis Ace (latter includes FRAC Group 7 fungicide). A heads-emerged spray with these fungicides also protects upper leaves against fungal leaf blotches, powdery mildew, and rust. Scald has already been observed on susceptible varieties. Foliar sprays of any of these three products up to seven days after head emergence may still result in significant FHB and DON suppression. Fungicide products containing QoI (FRAC Group 11) fungicides should not be applied to headed wheat or barley as they may result in increased levels of DON in grain.

Winter wheat is generally a week or more behind in development from winter barley planted on the same fall date. Winter wheat in New York varies from stem elongation to flag leaf visible stages. We should reach the critical fungicide application window for winter wheat over the next two weeks. The DMI (FRAC Group 3) containing fungicides Caramba, Prosaro, or Miravis Ace (latter includes a FRAC Group 7 fungicide) are the most effective fungicides for suppression of FHB and DON contamination when applied at flowering (emergence of yellow anthers on heads). A flowering application of these fungicide products 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. Stagonospora nodorum blotch and powdery mildew have already been observed. There is an application window of approximately 7 days from the beginning of flowering in which reasonable FHB and DON 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, 06/11/19

Wheat is beginning to flower in the northcentral and thumb regions of Michigan, though some of the October- seeded crop is still a week away. Growers are encouraged to watch this risk map and consider using a fungicide to protect susceptible varieties. Also consider any leaf diseases that might pose a threat to the flag leaf in the weeks to come. Because flooding is preventing ground application in some areas, aerial application may be a reasonable alternative. Although there are few studies on applying fungicides to wheat by air, it is worth looking at the Extension bulletin called "Aerial Application of Fungicide for the Suppression of Fusarium Head Blight". This piece has a few suggestions for obtaining good coverage of the wheat heads including the use of: 1) a minimum of 5 gallons/acre of water; 2) a “large fine” to “fine medium” spray droplet; 3) a minimum pressure of 30 psi and 4) an application altitude of 8 to 12 feet depending or the aircraft.

--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 WI, 06/10/19

Most varieties of winter wheat are now at anthesis (flowering) in southern and south-central Wisconsin. Now is the time to manage Fusarium head blight (FHB or scab) and vomitoxin. The Fusarium head blight Risk Model (http://www.wheatscab.psu.edu) has tapered off in the last week in terms of predicted risk of FHB. However, there are still areas of moderate to high risk in the primary wheat growing region of the state. Weather conditions are projected to turn excessively wet over the next 3-5 days, thus I predict risk will rise again. FHB was severe in many wheat fields in 2018, and considering the weather this season and reports of FHB to our south, I anticipate 2019 being problematic. Fungicide products of choice to control FHB in Wisconsin include Caramba, Prosaro, and Miravis Ace. Multiple years of data in Wisconsin suggest that the best application window for any of these products begins at the start of anthesis until 5-7 days after the start of anthesis. Applying fungicide before anthesis or more than 7-10 days after anthesis will result in poor performance against vomitoxin accumulation. Information pertaining to recent fungicide studies on winter wheat in Wisconsin, can be found at this link: https://badgercropdoc.com/wp-content/uploads/sites/5/2018/12/2018-Fungic... and scrolling to page 12. Other reports can be found here: https://badgercropdoc.com/research-summaries/.

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

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, 06/06/19

The weather pattern has been quite favorable for Head scab during the past couple weeks so growers are encouraged to consider fungicide use if conditions warrant. Heads and flowers will likely emerge in southern counties during the next week. We may still be a week or more away in the Thumb and north-central counties. We now have three main products from which to choose: Caramba, Miravis Ace and Prosaro. If one elects to treat:: apply a few days after the first flowers emerge; target the heads by raising the boom to 8 to 12 inches above the heads; use dual nozzles directed both forward and backward ( or, if using single nozzle, at least direct it forward to achieve as much spray deposition on heads as possible); and create a moderately fine spray (if a misty vapor is rolling off the boom, the particles are too small and adjustments should be made).

--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 NY, 06/04/19

The Fusarium Risk Assessment Map (http://www.wheatscab.psu.edu/riskTool.html) continues to indicate a moderate to high risk of Fusarium head blight (FHB) for several areas of New York. Much of the state’s winter wheat will initiate flowering this week. The triazole products Caramba and Prosaro are the most effective fungicides for suppression of FHB and deoxynivalenol (DON) mycotoxin contamination when applied at flowering (emergence of yellow 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. There is an application window of approximately 7 days from the beginning of flowering in which reasonable FHB and DON suppression can be expected.

All but the latest planted winter barley is beyond the timing for a fungicide application. In barley, maximal suppression of FHB and grain contamination by DON results when fully emerged heads are sprayed with full label rates of Caramba or Prosaro fungicides. Application up to 7 days after full head emergence may still result in significant suppression of FHB and DON.

Attend Cornell’s Small Grain Management Field Day (http://events.cornell.edu/event/2019_small_grains_management_field_day ) on June 6 to learn more about integrated management of FHB and DON and to view the leading varieties of winter wheat, barley, and rye.

--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 WI, 05/31/19

The University of Wisconsin-Madison Field Crops Pathology crew has spent the last several days scouting winter wheat variety trials in south and south central Wisconsin. Wheat at all locations observed, had flag leaves fully emerged. Weather has been extremely wet and cool across the state. Despite the wet conditions, wheat was generally disease free. We are worried about the risk for Fusarium head blight (FHB) this year given the weather pattern we have been stuck in. Currently the Fusarium head blight Risk Model is showing mostly high levels of risk in the primary wheat growing region of the state. While no heads have emerged, heading will begin in the next 1-2 weeks. Pay close attention to the risk model and your local weather as we approach anthesis (flowering). I anticipate the risk to remain high as periods of rain and humidity persist. Fungicide products of choice to control FHB in Wisconsin include Caramba, Prosaro, and Miravis Ace. Multiple years worth of data in Wisconsin suggest that the best application window for any of these products begins at the start of anthesis until 5-7 days after the start of anthesis. Applying fungicide before anthesis or 7-10 days after anthesis will result in poor performance against vomitoxin accumulation, out of the product. For information pertaining to recent fungicide studies on winter wheat in Wisconsin, click this link and scroll to page 12 of the report: https://badgercropdoc.com/wp-content/uploads/sites/5/2018/12/2018-Fungic.... Other reports can be found at this link: https://badgercropdoc.com/research-summaries/.

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

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

Pages

Subscribe to RSS - Northern SWW Region's blog