Abstract
Rhagoletis pomonella, living on apple, and R. mendax, infesting blueberry, represent a closely related sibling species pair with very limited morphological differentiation. Allozyme studies indicate that these species coexist with no detectable gene flow in areas where both hosts occur in close sympatry (Feder et al., 1989). However, viable interspecific F1, F2 and back-cross progeny can be easily produced in the laboratory (Bush, 1966). Therefore, premating isolating barriers must exist that restrict hybridization between these sibling species in nature.
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