Osprey Winter Wheat – Best Suited for Fall Applications

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

Osprey is registered for grass weeds in winter wheat, including annual ryegrass and annual blue grass. Osprey also controls a number of broadleaf weeds that are common in our area. Osprey is not labeled for barley. Osprey is used at 4.75 oz wt/A. Application timing is emergence to jointing of wheat or 2 leaf to 2-tiller grasses. Osprey requires a non-ionic surfactant plus nitrogen. Fertilizer nitrogen (28 to 32% N solutions) should be used at 1 to 2 qt/A. Ammonium sulfate (AMS) can be used at 1.5 to 3 lb/A. Osprey can be applied with methylated seed oil. Osprey should not be applied with crop oils or silicone based surfactants. Osprey is not labeled for use with liquid fertilizer carriers. The label states that liquid fertilizer solutions should be no more than 15% of the spray carrier volume. Nitrogen fertilizer greater than 15% of the spray volume should not be applied within 14 days of the Osprey application, which makes timing of spring applications difficult. As a result, fall applications are more appropriate than spring. Osprey can be tankmixed with a Harmony GT and Harmony Extra (as well as other herbicides), but tankmixtures with Banvel/Clarity or 2,4-D may reduce grass control. The grasses specifically mentioned on the label that are important in our region are annual ryegrass (it will not control volunteer grain rye), annual bluegrass, and roughstalk bluegrass. The label lists brome species as suppression. Broadleaf activity is good on wild radish and wild mustard plus suppression of henbit and common chickweed. UD has tested Osprey for ryegrass the past two to three years with favorable results. Soybeans can be planted 90 days after treatment and refer to the label for other crops.

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