Sequential Decision Plan for Control of Pea Aphid., Acyrthosiphon pisum (Homoptera: Aphididae), on Field Peas in Manitoba

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Abstract
A sequential decision plan for chemical control of pea aphid, Acyrthosiphon pisum (Harris), on field peas in Manitoba was derived from studies of aphid dispersion among plant tips in field plots at two locations over 3 yr. Based on Taylor’s power law, aphid distributions showed similar levels of aggregation among years and locations. A common relationship between variance and mean was calculated (loges2 = 0.81 + 1.49 logex). When applied to populations in 25 commercial pea fields, the sequential decision plan gave the same control decision as a fixed sample of 100 plant tips but required only 20–35 plant tips to do so.