Control of Carex appressa R.Br. using herbicides and surface sown pasture species

M.H. CampbellA, D.W. BurbidgeB and H.I. NicolA

A NSW Agriculture, Agricultural Research and Veterinary Centre, Forest Road, Orange, New South Wales 2800, Australia.

B 'Burnafahes', Bigga, New South Wales 2583, Australia.


The effect of type, rate and time of herbicide application, drainage, slashing and sowing improved pasture species on the control of Carex appressa was determined at Bigga and Orange, New South Wales between 1990 and 1996. Results showed it was necessary to drain the area prior to treatment so that improved species, particularly legumes, could establish and survive. Glyphosate proved the most effective herbicide in killing vigorously growing C. appressa when applied at 0.9 kg a.i. ha-1 in January or February. Slashing with a forage harvester in early summer removed C. appressa foliage and allowed pasture species to establish when sown late in the following winter. A two-spray treatment was necessary: glyphosate in January/February to kill C. appressa and glyphosate again in late winter to kill volunteer weeds. Sowing pasture species in late winter avoided periods of waterlogging that occurred earlier in winter. Lotus pedunculatus, Trifolium repens, Festuca arundinacea and Phalaris aquatica were the most successful species for tolerating short periods of waterlogging and competing with seedling regeneration of C. appressa.


Plant Protection Quarterly (1997) 12 (3) 120-124.