Allozyme variation in the melon fly Dacus cucurbitae (Insecta: Diptera: Tephritidae) from peninsular Malaysia

Abstract 1. 1. Population samples of Dacus cucurbitae from four localities in Peninsular Malaysia were analyzed for 5–12 gene-enzyme systems comprising 7–14 loci. 2. 2. Six loci, EST-F, HK-2, IDH, aMDH, PGM and PGD, were polymorphic. 3. 3. Hexokinase-2, isocitrate dehydrogenase, anodal malate dehydrogenase and phosphogluconate dehydrogenase were represented by two alleles each, while esterase-F and phosphoglucomutase were represented by three alleles each. 4. 4. Phosphoglucomutase showed greater variability than the other polymorphic loci, while phosphogluconate dehydrogenase was the least variable. 5. 5. The proportion of polymorphic loci ranged from 0.21 to 0.57, while the mean heterozygosity ranged from 0.09 to 0.23.