University of Illinois

No. 3/April 11, 1997

Spring Seeding of Alfalfa

Balan, Eptam, or Treflan can be used preplant-incorporated before spring seeding of alfalfa (no grass­legume mixes) to minimize competition from grass weeds. Balan is used at 3 to 4 quarts per acre, Eptam at 3.5 to 4.5 pints per acre, Treflan HFP (4E) at 1.0 to 1.5 pints per acre, and Treflan TR-10 (10%G) at 5 to 7.5 pounds per acre.

Poast Plus can be used postemergence at 18 to 48 fluid ounces per acre to control seedling grasses in spring-seeded alfalfa. It can be tank-mixed with 2,4-DB (Butyrac or Butoxone) to provide broadleaf weed control. Apply 1 to 3 quarts per acre of 2,4-DB before broadleaf weeds are 3 inches in diameter or height. See label for adjuvant suggestions.

Pursuit can be applied when seedling alfalfa is in the second-trifoliate stage and when most of the weeds are 1 to 3 inches tall. Use 3 to 6 fluid ounces per acre of Pursuit 2AS or 1.08 to 2.16 ounces per acre of Pursuit 7ODG. See the label for adjuvant suggestions.

Buctril 2E can be applied at 1 to 1.5 pints per acre to seedling alfalfa with at least four trifoliate leaves. Apply to weeds at or before the 4-leaf or 2-inch stage. Do not apply Buctril to alfalfa when temperatures are expected to exceed 70°F during or for 3 days after application. Do not add a surfactant or crop oil.

Marshal McGlamery and Aaron Hager, Department of Crop Sciences, (217)333-4424