Abstract
This paper questions whether current control of the pasture weed nassella tussock ( Nassella trichotoma (Nees) Hack. ex Arech) is worthwhile, and how management can be improved. A computer model is developed to simulate nassella tussock population growth, and to provide a basis for calculating economic effects. The existing policy objective of eradication is shown to be inappropriate for economic and practical reasons. Cost-benefit analysis indicates that current government control programmes yield positive net benefits at a 10% discount rate, under realistic population growth-rate assumptions. An economic threshold model confirms that control should be undertaken at current levels of infestation. An optimization model suggests that greater net benefits would be obtained with less frequent control operations than currently practiced.
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