Abstract
AbstractThe dispersion of the bluegreen aphid Acyrthosipon kondoi Shinji in lucerne conformed to the negative binomial distribution and a high degree of contagion was evident from aggregation indices. These data were used, together with proposed treatement thresholds, to develop and test sequential sampling plans for this aphid based on a single stem sampling unit. Four plans, accounting for variations in plant growth stage and varietal susceptibility to A. kondoi were computed at 2 treatment threshold levels. One of these plans was tested on 3 lucerne varieties in the field. Treatments made on plan recommendations restricted yield losses to within expected limits.
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