FHB Alert Blog

FHB Update from DE, 04/25/17

Cool, wet weather has persisted and is forecast through 4/28. Wheat is likely to start flowering this week in varieties that started to head out at the end of last week in southern portions of MD and DE. Applications of Prosaro, Proline, and Caramba can be made anywhere from the start of flowering (roughly 50% of main tillers flowering in the field) to 5-6 days afterwards without a loss of efficacy. Applicators should include 0.125% NIS and apply at least 2 hours before rain for maximum effectiveness. Aerial applications should be made at 5 gal/A and at least 15 gal/A if applying by ground. Target 300-350 um droplet size. Nozzles angled forward 30 degrees will improve coverage of the head. I expect flowering will continue up the shore over the next 10-14 days. Growers should continually scout fields and check this page for updates.

--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 US, 04/25/17

Welcome to the Fusarium Head Blight Prediction Center. The current focus of the prediction models is on wheat in western KY, MO, IL, IN and parts of southern KS 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 this area, but conditions may change rapidly if we enter a period of rainy, humid weather. 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 NC, 04/25/17

Wheat crops that are flowering now in northern NC may be at significant risk of scab, especially if the variety is susceptible or moderately susceptible. This includes Dare County, and north of the Albemarle Sound (Perquimans, Pasquotank, Camden), as well as in the northern Piedmont (Surry, Stokes, Yadkin, Forsyth). 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. Average reported crop maturity: 80-90% of the crop in the Washington-Tyrrell-Beaufort-Hyde region is late in the flowering process, and should be mostly past vulnerability. North of the Albemarle: 50-60% of the crop is in the heading/flowering process, and is at greater risk, especially if the wheat variety is susceptible. Information on variety resistance is at https://smallgrains.ces.ncsu.edu/smallgrains-disease-identification-mana... and on ground and aerial fungicide application at https://smallgrains.ces.ncsu.edu/smallgrains-head-scab/.

--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 OK, 04/22/17

Wheat around Stillwater varies but appears to be in various stages of grain formation. Based on talking to a number of producers across northern Oklahoma, wheat heads have fully emerged but has not yet flowered or just beginning to flower. Of course, as you go further west into the panhandle the wheat is not as far along. I’m not sure as sure about central and southern/southwestern OK, but I talked to one grower today from southwest OK that indicted his wheat varied from starting to flower to kernels being formed. This same grower indicated leaf rust is the most common disease he has seen, and in some fields it is fairly heavy. Across northern OK, producers indicated they are not finding severe levels of foliar disease (primarily rust), but it is there (again, especially leaf rust). Brian Olson (my A&P) spent all of yesterday rating wheat at Lahoma (15 miles west of Enid in northern OK). He indicated there were some hot spots/areas of heavy leaf rust, but that over all, leaf rust was light in the plots he was rating. He also indicated he saw quite a bit of what he assumed to be physiological leaf spot, which we tend to see more of in years with cloudy, cool and rainy weather such as this year. Around Stillwater, I observed both stripe rust and leaf rust, but more leaf than stripe. In some cases, there was a mixture of both rusts on the same leaf.

Samples testing positive for Wheat streak mosaic virus (WSMV) have continued to come into the Diagnostic Lab. To date, about 45 samples have been tested for WSMV, High plains virus (HPV), and Barley yellow dwarf virus (BYDV). Thirty-two of the 45 were positive for WSMV, 24 were positive for BYDV, and 2 were positive for HPV (co-infection with WSMV). Eleven of the samples were positive for WSMV and BYDV. Most of these samples were received from central and west-central Oklahoma, but it seems the area is expanding. For more information on mite-transmitted wheat viruses such as WSM, please see OSU Fact Sheet EPP-7328 (Wheat Streak Mosaic, High Plains Disease, and Triticum Mosaic: Three Virus Diseases of Wheat in Oklahoma) available at http://pods.dasnr.okstate.edu/docushare/dsweb/HomePage

--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 VA, 04/21/17

Wheat is beginning to flower throughout Virginia, so it is time to make decisions about fungicide applications for both Fusarium head blight (FHB) and to protect the flag leaf as the grains begin to form. Currently, the risk for FHB is low in most parts of Virginia, even for susceptible varieties. Rains are expected over the weekend, but dry weather over the past several weeks has not favored spore production by the FHB fungus, so risk of FHB infection is expected to remain low for wheat that is flowering over the next week. However, now may still be the time to apply fungicides for foliar diseases including stripe rust, powdery mildew, and leaf blotch. The flag leaf must be protected during grain development to maximize yields. Again, due to the dry weather some areas have very little disease, and scouting is still recommended prior to making a fungicide application. However, there have been numerous reports throughout the region of outbreaks of stripe rust (especially on Shirley) and powdery mildew. Do NOT apply a strobilurin or fungicide pre-mix containing a strobilurin after flag leaf emergence (Feekes 9) since this can increase DON contamination in the grain. Prosaro, Caramba, and Proline are the most effective products for reducing FHB and DON contamination, and these fungicides will also control foliar diseases such as leaf blotch, stripe and leaf rust, and powdery mildew.

--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 IN, 04/21/17

Wheat heads have emerged in southern Indiana and flowering may begin this weekend or early next week. Currently, the overall risk for Fusarium head blight is predicted to be low, but scattered rain over the weekend and high humidity may increase risk locally. Producers should be prepared to apply a fungicide if weather conditions are humid and rainfall is predicted. Fungicide applications should be applied at early flowering to be most effective. Purdue research indicates that applications of the fungicides Prosaro and Caramba are most effective at managing FHB if they are applied at early flowering (Feekes growth stage 10.5.1). Other products are available, but may not be as effective. If weather or other factors delay application and risk for FHB is high, Purdue University research indicates that fungicides applied a few days after flowering can reduce deoxynivalenol (DON) compared to no fungicide application.

--Kiersten Wise, Extension Plant Pathologist, Purdue 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 KY, 04/21/17

Wheat across Kentucky is anywhere from heading to flowering. According to the risk map, the current risk of Fusarium head blight in Kentucky is low. That risk may change with the rainfall that is being received across the state and with forecasted rain for the next couple of days. Stripe rust also is being observed in several areas across the state on susceptible varieties.

Caramba and Prosaro fungicides have been shown to be the most effective fungicides in protecting against Fusarium head blight and deoxynivalenol (DON) contamination of the grain in multi-year, multi-university-conducted research trials. Research supported by the USDA-ARS U.S. Wheat & Barley Scab Initiative also has shown that the best timing of a fungicide application for protection against Fusarium head blight is Feekes 10.5.1 (early flowering). Additional research has shown that if this timing cannot be met (due to weather, etc.), that it is better to be slightly later than Feekes 10.5.1 than slightly earlier than Feekes 10.5.1.

--Carl Bradley, Extension Plant Pathologist, University of Kentucky

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, 04/20/17

Most wheat is at flag leaf or the boot stage in many parts of Delaware, and some early-planted wheat in Southern regions of Maryland are starting to head out. Once wheat has headed, expect flowering to start in 3-5 days, Currently there is a chance for rain in the forecast within the next 5-7 days. However, dry weather over the past 2-3 weeks has not been favorable for spore production and disease potential. I do not expect the forecasted rains will have a significant impact on FHB risk forecasts over the next week given our recent dry spell.

--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 http://www.scabusa.org

FHB Update from KY, 04/19/17

Wheat in Kentucky is anywhere between boot and flowering. Currently, the risk of Fusarium head blight is low, but forecasted rain in the upcoming days may change that risk. Stripe rust is present on susceptible varieties. An application of Caramba or Prosaro at Feekes 10.5.1 (when anthers begin to extrude out of the middle part of the wheat head) will provide some protection against both Fusarium head blight and stripe rust.

--Carl Bradley, Extension Plant Pathologist, University of Kentucky

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 http://www.scabusa.org

FHB Update from US, 04/14/17

Welcome to the Fusarium Head Blight Prediction Center. The current focus of the prediction models is on wheat in western TN, and KY, as well as, parts of southern MO, IL and KS where the wheat is approaching or already at the flowering growth stages that are most vulnerable to Fusarium infection. 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 http://www.scabusa.org

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