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- W223720712 abstract "Dispersal of the 2 populations of the alfalfa weevil, Hypera postica (Gyllenhal), in Nebraska was determined by viability of eggs obtained from cross matings of Nebraska weevils with weevils from laboratory-reared colonies of Mary land (eastern) and Utah (western) origin. In previous cross-mating studies with the nearly identical eastern and western populations of the weevil, the cross of eastern females and western males produced inviable eggs. Single pair matings were: virgin Maryland females x field-collected Nebraska males and virgin Nebraska females x Utah males. From cross-matings of Nebraska weevils collected in 1975, 1976, and 1977, the indication is that the eastern and western populations overlap in Central Nebraska at least 150 miles (241 kilometers). The alfalfa weevil, Hypera pos tica (Gyllenhal), has been accidentally in troduced into the United States at least twice, into Utah in 1904 and into Maryland in 1951. That these 2 introductions represent distinct populations is well known and is based on various differences in behavior. Several attempts to differentiate the 2 populations have been made. Pienkowski et al. (1969) found significant differences between the 2 populations in selected proportionate anatomical measurements, but the ranges of the measure ments overlap and can be used only to distinguish between a series of spec imens. Differences in the percentage of encapsulation by the weevil larvae of the eggs of the parasitoid Bathyplects curculionis (Thomas) were noted by Puttier (1967). Differences in encapsulation rate were also used by van den Bosch (1971) as a means of determining the relative distribution of the alfalfa weevil and the Egyptian alfalfa weevil, H. brunneipennis (Boheman) in California. Blickenstaff (1965) was the first to demonstrate reproductive incompatibility between the 2 populations. When eastern females are crossed with western males, inviable eggs are produced. In the reciprocal cross, western females crossed with eastern males, the eggs are fertile and the resultant progeny consists of 6 females for every male. The normal sex ratio for the species is 1:1." @default.
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- W223720712 date "1979-01-01" @default.
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- W223720712 title "Distribution of eastern and western alfalfa weevil in Nebraska determined by cross-matings (Coleoptera: Curculionidae)." @default.
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