Addition of sulfometuron methyl to fall site preparation tank mixes improves herbaceous weed control

Ezell, A.W.

General Technical Report Southern Research Station, USDA Forest Service (SRS-48): 251-253


Accession: 003633810

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A total of 12 herbicide treatments and 1 control were applied to a recently harvested forest site (mixed pine-hardwood forest) in Winston County, Mississippi, USA, which include: (T1) krenite /A; (T12) T7 + 19 oz oustar/A; and (T13) untreated. All treatments were representative of forest site preparation tank mixtures and were applied early September 1999. Three ounces of Oust7 were included in two of the tank mixes, and 19 ounces of Oustar7 were included in two of the mixes. All treatments were applied with a CO2-powered backpack sprayer to simulate aerial application at 10 gpa. In May, June, July, and August of 2000, treatment plots were evaluated for herbaceous competition control. During October 2000, plots were evaluated for woody stem control based on a comparison with pre-treatment measurements. In May 2000, herbaceous species had reduced the average percent clear ground to 42-62% in plots without Oust or Oustar while those plots with the products added had 94-97% clear ground. Untreated areas had only 1% clear ground by this rating time. Percent clear ground continued to decrease to 10-15% in July for plots without Oust or Oustar while plots were 83-94% clear in treatments with the product. By August, plots with the Oust were 65-80% clear and those with Oustar were 57-92% clear whereas plots without the products were 5-13% clear. Both Oust and Oustar provided excellent herbaceous weed control for 12 months following application in this study. Oustar provided slightly better control than the Oust.