Crop performance testing results are released annually through the activities of SDSU Extension and the South Dakota Agricultural Experiment Station at SDSU.
Pre-harvest herbicide applications may be considered in fields where small grains are grown for seed or forage. Dense weed populations may inhibit harvest.
We have received quite a few reports of true armyworm caterpillars being an issue in Northern South Dakota wheat. These insects are capable of causing a lot of defoliation during the growing season.
Wheat yields are determined by the combination of main stem, and tillers. A tiller is a stem or shoot produced after the initial parent shoot grows from the wheat seed.
Leaf rust was found in crop performance test (CPT) plots in Tripp and Brookings Counties. Generally, leaf rust was observed at a low severity, however, two lines in the CPT had severe levels. Leaf rust pathogen, Puccunia triticina, does not overwinter in South Dakota and spores are blown from southern states.
The majority of spring wheat is at heading and shortly the crop will be flowering. The flowering growth stage coincides with Fusarium head blight (FHB) or scab development.
Bacterial leaf streak (BLS) was found in several winter wheat fields scouted this week. This continues to be the main disease currently observed in winter wheat, whether a fungicide was utilized.
With the recent frequent rains for some areas and rain in the forecast, the risk for Fusarium head blight (FHB) or scab has changed. Areas in the south central and east now have a moderate to high risk for scab.
We have started to received reports of true armyworm caterpillars showing up in South Dakota wheat fields. So far, the reports have originated from winter wheat fields in Central South Dakota.
A few wheat fields scouted last week were found with white (bleached heads). Several factors can lead to white heads in a wheat field. The most common cause of white heads is wheat stem maggot feeding.