Herbaceous weed control in slash pine and cottonwood plantations

Knowe, S.A.

Proceedings, Southern Weed Science Society, 37th annual meeting: 214-217


Accession: 001380413

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Studies were conducted in seedlings of Pinus elliottii on a poorly drained P-deficient loam soil in Louisiana and of Populus sp. on a highly fertile alluvial clay loam, subject to flooding, by the Mississippi River. In P. elliottii, 0.25 and 0.5 lb sulfometuron-methyl and 1 and 1.5 lb hexazinone/acre post-em. controlled Cyperus spp., Juncus spp. and Eupatorium capillifolium; hexazinone also controlled Panicum spp. Dowco 453 (haloxyfop) controlled grasses but this allowed E. capillifolium to spread. Mortality with sulfometuron and haloxyfop was 10% greater than on untreated plots. In Populus sp. 0.25-0.5 lb sulfometuron-methyl or haloxyfop and 0.5-0.75 lb fluazifop-butyl/acre controlled weeds, but tree mortality was 12-14% with fluazifop-butyl and the high rate of haloxyfop and was excessive with sulfometuron-methyl.