Abstract
Formulae which determined tuber surface area from tuber dimensions and weight were tested by using samples from three potato cultivars. Surviving populations of a labelled isolate ofErwinia carotovora ssp.atroseptica following planting, and populations of a fluorescent pseudomonad following dusting with a bacterial powder formulation were used to demonstrate the application of these formulae to the calculation of bacterial density on the tuber surface. Results obtained by washing whole tubers using the formulae to calculate the surface area were shown to be comparable in sensitivity with those obtained by dilution-plating of periderm discs of 1cm2.
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