New Zealand Journal of Agricultural Research abstracts

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Dairy production revenue losses in New Zealand due to giant buttercup (Ranunculus acris)

G. W. Bourdôt
D. J. Saville

AgResearch Limited
P.O. Box 60
Lincoln, New Zealand
email: graeme.bourdot@agresearch.co.nz

D. Crone

Ministry of Agriculture and Forestry
Village Mall, Queen Street
Richmond, New Zealand

Abstract  Giant buttercup (Ranunculus acris L.), a species of European origin, is widespread throughout New Zealand, and is an intractable weed of dairy pastures in parts of the south Auckland, Hawke’s Bay, and Taranaki regions and in the districts of Southern Wairarapa, Horowhenua, and Tasman. In this study, the seasonal progression of the weed's ground cover in dairy pastures in the Tasman District was measured during 1989–90 and used, in conjunction with monthly weed-free pasture dry matter production values, to estimate the annual percentage loss in pasture production due to a typical infestation of the weed subjected to typical control measures. Extrapolation to other infested regions and districts provided a national estimate of milk solids revenue loss due to giant buttercup in New Zealand dairy pastures of $156 million in the 2001-02 season.

Keywords  giant buttercup; Ranunculus acris L.; dairy pasture; milk solids; weed; economics

A02016; Received; 4 March 2002; accepted 25 June 2003; online publication date 5 November 2003
New Zealand Journal of Agricultural Research, 2003, Vol. 46: 295–303
0028–8233/03/4604–0295 $7.00/0 © The Royal Society of New Zealand 2003

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