Oustar: a premixed blend of Velpar DF+Oust XP for herbaceous weed control and enhanced loblolly pine seedling performance

Yeiser, J.L.; Ezell, A.W.

General Technical Report Southern Research Station, USDA Forest Service (SRS-71): 330-335


Accession: 004259177

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Six tests were established comparing the herbaceous weed control (HWC) and resultant loblolly pine (Pinus taeda L.) seedling performance from treatments of Oustar (0, 10, 13, 16, 19 ounces product acre-1), and industry standards (Velpar L+Oust 32+2; Arsenal+Oust 4+2 both in ounces product acre-1). Sites were prepared prior to planting with: burn only, chemical only, mechanical only, or mechanical and chemical methods. Oustar (13 ounces) and industry standards provided similar weed control and seedling performance. The low rate (10 ounces) of Oustar applied to sandy loam soils receiving chemical preparation and plowing prior to planting provided bareground comparable to industry standards. When averaged across test sites, herbicide plots consistently had more bareground than untreated plots by nearly 2x 30 days after treatment (DAT), 3x 60 DAT, 4x 90 DAT, and 5x 120 DAT. Similarly, herbicide plots had more seedling survival (9 percent), total height (0.69 feet), ground line diameter (0.26 inch), and volume index (1.54 cubic feet) than untreated plots.