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Seven kale clones which had been previously assessed for resistance to Brevicoryne brassicae were compared for isoenzymic patterns of esterase (EST), acid phosphatase (ACP), glutamate dehydrogenase (GDH), glutamate oxaloacetate transaminase [aspartate aminotransferase] (GOT), leucine aminopeptidase [cytosol aminopeptidase] (LAP), malate dehydrogenase (MDH) and peroxidase (PO) systems. EST, the only monomorphic enzyme, was inefficient for discriminating between genotypes, whereas ACP, because of its accentuated polymorphisms, allowed the separation of five out of seven of the clones. No association between the ACP loci and resistance or susceptibility to the aphid was established. However, ACP using standard 5, and GOT using standard 9, identified the Venus clone, one of the most resistant to the pest. The other systems were not efficient in separating clones or in identifying resistance …