Weed Control in New Alfalfa Seedings

Early planted new seedings should be scouted for annual broadleaf weeds. The risk of injury to alfalfa seedlings is greatly increased when 2,4-DB application is made outside of the first to the third trifoliate stage window. Note in Publication 75, Guide To Weed Control has the incorrect product rate for 2,4-DB applied to underseeded cereals. The correct product rate is 0.7 to 0.9 L/ac when the formulation is 625 g/L. Field experience has demonstrated that reducing the rate of herbicide can reduce the risk of injury to alfalfa seedlings while providing acceptable suppression or control of weed seedlings.

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