Volunteer wheat in summer seeding alfalfa

Mark Renz-Extension Weed Scientist

1. EPTC (Eptam): Eptam can be used and is labeled for use and effective at rates of 2.25 pts/A (of Eptam 7E). Since this is a pre plant incorporated treatment it is critical to apply Eptam to a smooth, dry seedbed just before planting and immediately incorporate to a depth of 2 to 3 inches to prevent herbicide loss through evaporation. Where possible, simultaneously apply and incorporate Eptam in one operation.

1. Clethodim/Sethoxydim (Poast Plus/Select) Poast Plus or Select (plus appropriate additives) are very effective and relatively cheap if applied when wheat is 4 to 6 inches tall and actively growing. Best control is seen if treatments occur when wheat is 4 to 6 inches tall and actively growing. Do not wait until the spring or early summer to treat as plants often are much larger and cold weather will reduce the effectiveness of these herbicides. Poast Plus and Select also kill volunteer oats, but oats usually die during the winter and seldom require treatment.
2. Imazamox (Raptor): Raptor applied with the appropriate additives has good control of broadleaf and grass species if applied at the correct stage of development of target weeds. For volunteer wheat apply 5 fl oz./A when plants are 2-4 inches tall. Do not make applications until the alfalfa plants have developed at least two trifoliate leaves.   This product should be selected if fields have extensive broadleaf and grass weeds as the cost of Raptor is typically two times as much as the previous options.