FHB Alert Blog

FHB Update from IL, 05/09/18

Storms are pushing through today (5.9.18) which may increase FHB risk in some areas. Early wheat has headed in some parts of the state and will likely start flowering by the end of the week. Caramba, Prosaro, and Proline can be applied from the start of flowering (50% of main tillers starting to flower) through about a week after this point without a loss in efficacy. Other active ingredients such as tebuconazole (Folicur etc) and propiconazole (Tilt etc) can be used but are not very efficacious for FHB. Do not apply products containing a strobilurim (QOI: FRAC group 11) to heads as these active ingredients have been demonstrated to increase vomitoxin in our replicated trials. Additional information can be found http://cropdisease.cropsciences.illinois.edu/

--Nathan Kleczewski, Research Assistant Professor and Extension Specialist, University of Illinois

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, 05/08/18

Wheat in southeast Kansas is currently at the heading and flowering stages of growth that are most vulnerable to infection by the Fusarium fungus. The risk maps currently indicate the risk of severe head blight, but given recent rains and humidity, I believe the risk may be greater than predicted. Wheat growers in Southeast portion of the state should consider protecting their crop with a fungicide. Prosaro, and Caramba are the best available fungicide options for FHB management. Folicur or generic tebuconazole fungicides would also be an option. Fungicides containing strobilurin active ingredients are not labeled for control of Fusarium head blight and should be avoided.

--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 MO, 05/08/18

Wheat in Missouri is behind in its normal development due to an unusually cool and dry April. This means that much of the wheat in the southern portion of the state is only at the heading stage while wheat in the northern part of the state is at the flag leaf to boot stage. Disease reports have overall been minimal due to the dry conditions. As the wheat approaches the flowering stage in the southern half of the state, FHB risk may increase with the forecast calling for precipitation in some areas. In the coming weeks, continue monitoring your FHB risk with the FHB risk assessment tool. Updates to follow as the crop begins to flower.

--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 NC, 05/08/18

Wheat crops that are flowering now in northeast NC are at moderate risk of scab. Much of the crop there has already flowered and is past danger, but some fields are flowering now or will flower in the next 2 weeks and are at risk. It will pay to spray if the variety is susceptible or moderately susceptible, and possibly if it is moderately resistant. 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

FHB Update from KY, 05/06/18

Wheat is beginning to flower in some fields in Kentucky. Although the Fusarium head blight risk prediction is currently low, additional rain in the forecast for later in the week may raise the risk. From multi-state university research trials, the products that have shown to be the most efficacious in managing Fusarium head blight and the associated mycotoxin deoxynivalenol (DON; also known as vomitoxin) are Caramba, Prosaro, and Proline. The best application timing for management of Fusarium head blight and DON is when 50% of the plants in a field are beginning to flower (Feekes growth stage 10.5.1). University research has shown that fungicide applications within a few days after Feekes 10.5.1 (up to about 5 days), may provide similar control levels; however, it is important that preharvest intervals are observed and followed according to fungicide labels. Avoid applying fungicides that contain strobilurin active ingredients at late growth stages, as DON levels in grain may actually increase.

--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 OK, 05/05/18

This past week I was at field days in southwestern Oklahoma (Apache and Altus), and northeastern Oklahoma (Afton). I didn’t see a single leaf or stripe rust pustule at any location. Wheat in southwestern OK ranged from at flowering to kernel formation, and typically was short (less than knee high). There were a few exceptions to this, namely a couple fields near Apache that had been planted on summer fallow ground. Wheat in these two fields looked good with some powdery mildew on the low to mid-canopy. There also was evidence of root rot (white heads) that was caused by Fusarium (Figure 1). This root rot was at a low incidence. By contrast, wheat in northeastern OK was at flowering and typically was over knee-high, thick, and with high yield potential. On many varieties, powdery mildew was heavy in the low and mid-canopy, and in a few instances also was present on the flag leaf (Figure 2). Besides powdery mildew, Septoria leaf blotch was heavy throughout the lower leaves of most varieties. In northeastern OK it appears that if a fungicide is going to be sprayed, that needs to be applied as soon as possible.

Based on my observations this past week and the recent report from Texas, it appears that rust pressure is low across Texas and Oklahoma. Hence, although there still is time for the rusts (especially leaf rust) to impact Oklahoma, it does not appear there will be an early season (during heading) high rust pressure as in most years. I still would be watchful and if you have a variety known to be susceptible to leaf rust with good yield potential (>about 30 bu/acre) I recommend considering a fungicide application. Be sure however, that your wheat has not matured past the allowed time (as indicated on the label) for the fungicide you apply. Additional information related to foliar fungicides can be found on the fungicide label and in OSU Current Reports 7668, Foliar Fungicides and Wheat Production in Oklahoma, which is available at: http://dasnr22.dasnr.okstate.edu/docushare/dsweb/Get/Document-4987/CR-76....

--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 IL, 05/04/18

This is the first FHB post of the 2018 season. Currently wheat in the state is at or near boot in more southern portions of the state and at or near flag leaf emergence heading from latitudes between Germantown and Champaign. Current forecasts call for a cool down in temperatures and some precipitation, which may slow crop development somewhat. Diseases in the crop have been low. Continue to check this page over the upcoming weeks as the crop approaches flowering for updates.

--Nathan Kleczewski, Research Assistant Professor and Extension Specialist, University of Illinois

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 TN, 05/03/18

Wheat continues to bloom in TN and in general there is low risk for FHB based on the model, scattered showers forecasted for the next day or two may increase risk on a local level. Consider your risk based on variety susceptibility, rain forecast, and field history (wheat after corn is at higher risk).

--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 US, 05/02/18

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 northern AR, southern 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 week. The current risk maps indicate a low risk of disease. The risk of disease 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, 05/02/18

Scab risk is currently low across the region, and will continue to be over the next few days. As temperatures have jumped, rains have ceased, and so conditions are not conducive to infection. Continue to watch the risk model since barley in the southern parts of the region has begun to head out.

--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

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