ethalfluralin (Sonalan HFP)
Rate 1.5 to 1.7 lb ai/a (4 to 4.5 pints/a) before nightshade germinates; 1.5 lb ai/a (4 pints/a) before dodder germinates
Time Apply before nightshade germinates and thoroughly incorporate into the top 2 to 3 inches of soil. Apply again in the spring at 1.5 lb ai/a (4 pints/a), before dodder germinates.
Remarks Special local needs labels ID-950020, OR-940037, and WA-940018. In Oregon, use only on alfalfa grown for seed in Malheur, Umatilla, Morrow, Josephine, and Jackson counties by members of the Oregon Alfalfa Seed Growers Assn., Gardena Alfalfa Seed Growers Assn., Inc., and Josephine Growers Cooperative Assn. For best results, herbicide should be activated within 2 days after application. For dodder control, herbicide may be activated by rain, irrigation, or mechanical incorporation, but do not mechanically incorporate more than 1 inch deep.
Caution Do not apply the year before rotating to another crop. Do not apply to seedling alfalfa (up to six-true-leaf stage) or to soils that are wet, cloddy, or subject to prolonged flooding.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline