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The article demonstrates that the asymmetric mating interactions between closely related but formerly allopatric genetic groups of the whitefly Bemisia tabaci, a haplodiploid species, have been a contributing factor in the widespread invasion and displacement by alien whitefly populations. Long-term field surveys, detailed behavioral observations and caged population experiments were conducted in Queensland and Zhejiang, China. It is pointed out asymmetric mating interplay may be essential in finding out the capacity of a haplodiploid invading species and the consequences.