By Scout Nelson
Recent hot weather, uneven rainfall, and a drier weather outlook have reduced leaf wetness periods across many small grain areas. As a result, the risk of Fusarium head blight (FHB) infection is decreasing in spring wheat fields that have not yet reached flowering.
Although FHB pressure has eased, other diseases remain active. Bacterial Leaf Streak (BLS) is widespread across the region, supported by humid and windy conditions, while low levels of leaf rust have been reported in parts of the Red River Valley.
A few FHB infections have also been detected in winter wheat variety trials at the Northwest Research & Outreach Center.
Growers are being encouraged to evaluate disease risks carefully as drought stress becomes more evident in some fields.
For spring wheat, fungicide applications are recommended at Feekes 10.51, the beginning of anthesis, when tan spot, Septoria, or leaf rust are present and the variety has a disease rating of 5 or higher in Minnesota Variety Trials
Treatment should also be considered for varieties rated susceptible or very susceptible to FHB.
Premium fungicides are recommended when grain corn was the previous crop because corn residue can increase disease risk. Producers should weigh the benefits of fungicide applications against crop conditions and yield potential.
Harvest activity is beginning to pick up across the region. The first oat fields in southern Minnesota have already been windrowed, and winter rye and winter wheat harvest is expected to begin soon.
With harvest approaching and overall disease pressure declining, this is expected to be the final small grains disease and pest update of the season. Producers are encouraged to continue monitoring field conditions and prioritize safety during harvest operations.
Photo Credit: gettyimages-ygrek
Categories: Minnesota, Crops, Corn, Wheat, Weather