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Inspection of wheat research plots and a wheat field at the UNL Agricultural Research and Development Center (ARDC) near Mead on June 4 confirmed Fusarium head blight, also known as scab. Incidence (percentage of diseased heads) was low and severity (percentage of diseased spikelets on a head) ranged from low to high. The disease is in its initial stages of development.
Due to the frequent and heavy rainfall events that occurred before and during flowering, development of Fusarium head blight is expected to progress to severe levels in susceptible varieties within the next two to three weeks in some areas in the state. As of June 5, the Fusarium Head Blight Risk Assessment Tool showed more than half of Nebraska at moderate to high risk.
Most of the Panhandle is at high risk. Although
Other diseases observed at the ARDC were black chaff and advanced stages of stripe rust. Black chaff is a bacterial disease; it is also known as bacterial streak when it occurs on leaves.
An application of Prosaro or Caramba is recommended at early flowering to control Fusarium head blight. Consider the yield potential and other factors such as damage already done by stripe rust when making the decision to apply a fungicide to control Fusarium head blight. The probability of a return on investment from applying a fungicide to control Fusarium head blight increases with increasing yield potential above 40 bu/acre. The
It is too late to control stripe rust in the southern part of the state. In northern wheat-growing areas, if wheat is in the early flowering growth stage and stripe rust has not progressed to damaging levels, consider applying Prosaro or Caramba to control both stripe rust and Fusarium head blight.
Black chaff cannot be controlled once it occurs.
Find more information on identification and management of diseases in wheat at cropwatch.unl.edu/plantdisease/wheat
Source: University of Nebraska CropWatch
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