By Scout Nelson
The University of Nebraska-Lincoln has issued a warning about the early detection of wheat streak mosaic virus (WSMV) in Nebraska wheat fields. During surveys conducted the week of April 21 in the southeast, southwest, and southern Panhandle regions, fields appeared healthy with lush green growth but showed signs of dry soil needing moisture.
Most fields were at growth stages ranging from Feekes 4 to Feekes 6, while some in Hitchcock County reached Feekes 7. Although many fields were thriving, isolated cases of the WSMV disease complex were observed in Gage and Hitchcock counties. Trace levels of fungal leaf spot diseases like Septoria tritici blotch and tan spot were also noted, though no rust diseases were found.
The University emphasized the importance of scouting wheat fields for early disease detection. Moisture and high humidity favor fungal diseases, making management critical. Recommended strategies include planting resistant varieties and applying fungicides to protect the flag leaf. Crop rotation and residue management can also help, as the fungi survive on crop debris.
WSMV is caused by three viruses transmitted by wheat curl mites. Double or triple infections can lead to severe yield loss or even complete crop failure. Managing volunteer wheat is crucial, especially volunteer growth after hailstorms. Volunteer plants should be completely eliminated at least 14 days before fall wheat planting.
Additional strategies to manage the virus include planting resistant or tolerant wheat varieties, avoiding early planting, and steering clear of planting wheat near late-maturing crops like corn, millet, and sorghum, which can host mites and viruses.
Growers are urged to stay alert, scout fields regularly, and apply proper management practices to protect their crops throughout the season.
Photo Credit:nebraska-extenstion
Categories: Nebraska, Crops, Corn, Soybeans, Wheat, Sorghum