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Leafy Spurge
Tordon 22K is the most effective herbicide for controlling leafy spurge. Tordon 22K at a high rate of 1 gallon per acre in mid-June will give 90% control, but this high rate is not cost effective for most farmers. However, a tank mix of 1-2 pints of Tordon 22K plus 2-4,D at 1 quart per acre of the 4 pound per gallon formulation applied annually for 3-5 years in June or September has been very effective.
Banvel at high rates has given good control but control is not as long lasting as picloram.
2-4,D will control top growth, but has little effect on reducing spurge stands.
Landmaster BW also has a label for leafy spurge control. Landmaster application is made to fall regrowth. Grass injury is possible with this treatment. Leafy spurge topgrowth control is good for about 1 year. Retreatment is necessary.
Observe closely label information concerning application of these products near water or where the water table is within 10 feet of the ground surface.
For more information consult the "2002 North Dakota Weed Control Guide" at http://www.ag.ndsu.nodak.edu/weeds/w253/w253w.htm
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