A total of 227 clear and dominant bands were produced by the selected 19 pairs of primers; of which, 207 bands (91.2%) were polymorphic among the test insect populations. The number of bands produced by each pair of primer ranged from 1 to 22, with an average of 11.9 bands (227/19). In the case of the polymorphism among insect populations, most of them varied from 70% to 89.5%. The WBPH showed the highest rate (89.5%) compared with all the other BPH populations. The polymorphism rate between Simao and Ha Tinh was the least, scoring 57.9%.