A binomial sequential decision plan for control of two-spotted spider mite on strawberries in Canterbury

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Abstract
The development of a binomial sequential decision plan, incorporating Taylor's power law, for control of two-spotted spider mite on strawberries in Canterbury is described and compared with a recommended spray schedule. No significant difference existed in yields between the two systems but savings of up to 4 cyhexatin applications were made by following the binomial sequential decision plan. Together with the monetary savings (NZ$500/ha, 1986 prices) from a reduction in spray applications, the problems associated with applied pesticides, resistance, and residues are minimised.