Control of Foxtail Millet(Setaria italica)in New Seedings of Alfalfa(Medicago sativa)with EPTC Applied in Surface Lines

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Abstract
At Hilario Ascasubi, Argentina, and Prosser, Washington, EPTC (S-ethyl dipropylthiocarbamate) was injected in sandy soil as two lines 5 cm deep and 6 cm apart. At 2 kg/ha (assuming the treated area was 12 cm wide), EPTC controlled 95 to 100% of foxtail millet [Setaria italica (L.) Beauv.] in a band 13 to 14 cm wide without significant injury to alfalfa (Medicago sativa L.) seeded 1.5 cm deep midway between the two lines of herbicide. At 3 and 4 kg/ha, EPTC sometimes injured alfalfa, but only temporarily, and at 1 kg/ha, it controlled 75 to 100% of the millet in a band 11 to 12 cm wide. Where alfalfa is seeded in rows, especially for seed production, subsurface line injection of EPTC could provide effective, efficient, and economical selective control of certain annual weeds.