Document Type

Peer-Review Article


In a nondiapause culture of cereal leaf beetles, Oulema melanopus (Coleoptera: Chrysomelidae), females ovipositing within 20 days after emergence were considered nondiapause. However, sexually active males in the same generation could be nondiapause or prediapause. Changes in the nondiapause incidence were compared between progenies from> 15 day old males that were feeding actively and photopositive (considered 'nondiapause' males) and progenies from younger males (nonselected males). Nondiapause females increased by 19% (n = 35 generations) and decreased 22% (n 31 generations) in the progenies of 'nondiapause' and nonselected males, respectively, suggesting that nondiapause males were selected in the former group, but prediapause males in the latter group substantially decreased nondiapause. In one generation, 14 progenies from individual pairs ranged from 21 to 100% nondiapause females, indicating that each sex in each parental pair was nondiapause, but nondiapause was incompletely expressed in most of the progenies.

The percentage of 'nondiapause' males was not significantly different than, and was strongly correlated to the percentage of nondiapause females of the same generation, indicating that nondiapause was not sex-linked, and that selecting males by age and behavior decreased the probability of dilution of nondiapause by prediapause males.

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