Dry beans (Othello) were planted June 3 into 30-inch rows at 60 lb/A in a conventional tillage system. Individual plots were 10 x 30 ft and replicated three times. Treatments were applied preplant incorporated (PPI) on May 30, preemergence (PRE) on June 6, or postemergence on July 15 (POST 1) or July 21 (POST 2) . The primary weed of interest was biennial wormwood (Biww). Kochia (Kocz), redroot pigweed (Rrpw), and common lambsquarters (Colq) were also present. This site was in wheat in 1998 and fallow 1999. Soil conditions at planting were much better than at Site 1.

^a Poast and Assure II were applied with COC at 1%, and Raptor was applied with NIS at 0.25%.
^b Treflan at 1.5 pt (PPI) and Assure II at 8 oz (POST) were applied to aid in handweeding.

We evaluated several registered and non-registered products for controlling biennial wormwood in dry beans. Spartan, Valor, Python, Broadstrike + Dual, Reflex, and Raptor are not registered (Section 3) for use in dry beans. The pH at this site is 5.5 with 4.3% organic matter. Valor was the only product that caused significant crop injury. Broadstrike + Dual and Python did not control biennial wormwood. Spartan, Sencor, and Valor effectively controlled all weeds. A split application of Basagran was slightly more effective than a single application. Basagran + Raptor provided fair control of biennial wormwood and kochia. Reflex + Raptor provided very poor biennial wormwood control.

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Last Updated: Thursday, May 27, 2004 02:49:18 PM
Published by North Dakota State University