Pre-emergent control of grass seedbanks in Allegheny hardwood stands with glyphosate-residual herbicide tank mixes

Horsley, S.B.

Proceedings, 40th annual meeting of the Northeastern Weed Science Society: 212


Accession: 001434135

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In field trials in Allegheny hardwood forests, Pennsylvania in 1983-84, bromacil, diuron, flurochloridone, napropamide, oryzalin, terbacil and sulfometuron methyl were evaluated in combination with 1.12 kg glyphosate/ha for control of grasses germinating after the elimination of Dennstaedtia punctilobula, Thelypteris noveboracensis, Acer pensylvanicum and Fagus grandifolia by glyphosate. Bromacil, diuron and terbacil interfered with initial control of ground vegetation by glyphosate when applied on 1 July and 1 Aug., but not on 1 Sept. Sulfometuron methyl, oryzalin, napropamide and flurochloridone mixtures reduced grass cover by 60, 30-50, 20-40 and 10-40%, resp., compared with glyphosate alone. After 2 years, grass cover on disturbed areas was 62, 40 and 22% of the glyphosate control for 0.05, 0.10 and 0.21 kg sulfometuron-methyl/ha, resp., and was higher for July than Sept. treatments.