Abstract

The insecticide mevinphos was suggested as a very convenient preharvest spray on grapes for a variety of reasons. As no information was available on absorption by spray operators under local circumstances cholinesterase inhibition during actual spraying was assessed in 5 operators in one experiment and in 10 operators and 2 controls in a further study. The results indicated that under spraying conditions which could be presumed to represent normal practice in the Cape vineyard area mevinphos spraying does not significantly affect blood cholinesterase concentrations in farm labourers engaged in spraying operations.

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