Meriem Aoun, Small Grains Pathologist Department of Entomology & Plant Pathology Oklahoma State University According to the Fusarium Head Blight (FHB) risk tool (wheatscab.psu.edu), there is currently a high risk of FHB across most of Oklahoma, with the exception of the Panhandle (Figure 1). This elevated risk is largely due to recent wet weather and [ Read More ]

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Meriem Aoun, Small Grains Pathologist Department of Entomology & Plant Pathology, Oklahoma State University Wheat streak mosaic (WSM) is a recurrent disease in the Oklahoma panhandle region however, this season WSM has been confirmed in several wheat fields in Blaine, Kay, Caddo, Garfield, Texas, Harper, Alfalfa, Kingfisher, and Payne Counties. Rainfall during the latter half [ Read More ]

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Meriem Aoun, Small Grains Pathologist Department of Entomology & Plant Pathology, Oklahoma State University In April, wheat streak mosaic (WSM) was observed in Blaine, Kay, Caddo, and Garfield counties. This follows earlier reports of WSM in Garfield and Payne counties from my March update. Samples from these locations were confirmed to be infected with wheat [ Read More ]

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Meriem Aoun Small Grains Pathologist Department of Entomology & Plant Pathology Oklahoma State University Disease pressure in Oklahoma remained low throughout March 2025. However, symptoms of wheat soilborne mosaic virus (WSBMV) and wheat spindle streak mosaic virus (WSSMV) were observed at two locations: the OSU Entomology and Plant Pathology farm in Stillwater and the OSU [ Read More ]

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Meriem Aoun, Small Grains Pathologist Department of Entomology & Plant Pathology, Oklahoma State University This season, the three rust diseases were observed in Oklahoma. Stripe rust prevailed in April and was reported in multiple locations in Oklahoma. Stripe rust distribution in Oklahoma and the dates of first detection for each county are described at https://wheat.agpestmonitor.org/stripe-rust/. [ Read More ]

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Meriem Aoun, Small Grains Pathologist Department of Entomology & Plant Pathology Oklahoma State University Stripe rust continues to increase in Southwestern Oklahoma (Jackson County and Tillman County). On March 31, Dr. Brett Carver, the wheat breeder at Oklahoma State University (OSU) noted high stripe rust pressure at the OSU research station in Tipton (Tillman County, [ Read More ]

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Meriem Aoun Department of Entomology & Plant Pathology Oklahoma State University On March 19, Tyler Lynch (Agriculturalist Sr, OSU, Department of Plant and Soil Sciences, OSU) brought wheat samples (Figure 1) showing tan spot symptoms from the wheat variety trials at Balko (Beaver County) and Hooker (Texas County), OK. Tyler reported that tan spot incidence [ Read More ]

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Meriem Aoun Department of Entomology & Plant Pathology Oklahoma State University Late February-early March 2024, symptoms of wheat soilborne mosaic virus (SBWMV)/wheat spindle streak mosaic virus (WSSMV) were observed at Oklahoma State University (OSU) Entomology and Plant Pathology farm in Stillwater. The susceptible wheat check ‘Vona’ and other susceptible hard winter wheat breeding lines showed [ Read More ]

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Meriem Aoun, Small Grains Pathologist Department of Entomology & Plant Pathology Oklahoma State University As we start the new wheat season in Oklahoma, some disease management strategies can be made this fall to reduce damage later in the season including cultural practices, genetic resistance, and chemical control. Planting date: Much of the winter wheat sown in [ Read More ]

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Meriem Aoun, Small Grains Pathologist Department of Entomology & Plant Pathology, Oklahoma State University During the last two weeks of May, high incidence and severity of leaf spotting diseases (mainly spot blotch and Septoria tritici blotch) were observed in multiple wheat fields in Oklahoma (Figure 1). These diseases were favored by the abundant rainfall during [ Read More ]

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