Genetic variation among 14 populations of Dioryctria disclusa Heinrich adults was examined using starch gel electophoresis. The average number of alleles per locus exceeded 2.0 in all populations. The number of polymorphic loci exceeded 70% in 11 populations. Genetic structure data suggest moderate differentiation (average Fst, 0.111) among the populations. Most of the differentiation is attributable to three of the eight loci (MDH, ME, and IDH). Nei's genetic identity ranged from 0.77–1.00 between populations. A phenogram based on genetic identity and unweighted pair-group method of analysis (UPGMA) clustered five of six populations in North Carolina closely together. With a cophenetic correlation of 0.96 the phenogram constructed is acceptable.

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