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New Zealand Plant Protection 65 (2012): 59-63

Weed control in establishing mixed swards of clover, plantain and chicory

T.L. Gawn, K.C. Harrington and C. Matthew

ABSTRACT

A field trial was conducted in Palmerston North to assess weed control options for establishing mixed swards of chicory (Cichorium intybus), narrow-leaved plantain (Plantago lanceolata), red clover (Trifolium pratense) and white clover (Trifolium repens), a pasture mixture currently popular for finishing lambs. Haloxyfop safely controlled grass weeds, and mowing twice during the first few months of establishment helped control some broad-leaved weeds. Flumetsulam was the safest herbicide for controlling broad-leaved weeds, although it caused severe suppression of plantain initially. All other treatments caused unacceptable levels of damage to at least one of the sown species. If chicory was not included in the mix, then bentazone, paraquat/diquat and diuron could be used. Options for an integrated weed control programme for the mixture of four species are discussed. For young clover-based pastures, hemlock (Conium maculatum) will be controlled better by flumetsulam or bentazone than 2,4-DB.

Keywords: plantain, Plantago lanceolata, chicory, Cichorium intybus, white clover, Trifolium repens, red clover, Trifolium pratense, herbicides, mowing, hemlock.

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