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Abstract
The sex ratio of Nysius huttoni was investigated in field and laboratory populations. Sex ratios of the eight samples of field‐collected but laboratory‐emerged (i.e., final moult to adult) populations ranged from 1:0.86 to 1:1.22, and the overall sex ratio of 587 adults (287? :300?) was 1:1.05. No significant differences from a 1:1, ?:? ratio were found (P > 0.05, χ2 test). Sex ratios in populations reared in the laboratory at different temperatures did not differ significantly from 1:1 (P > 0.05, χ2 test). However, varying sex ratios of populations produced under different photoperiods show that photoperiod seems to affect the sex ratio of N. huttoni. The results indicate that a short‐day photoperiod combined with low temperature produced the greatest proportion of males (significantly different at the 5% level). The sex ratio in the field populations (i.e., field‐collected adults) was close to 1:1 at mosttimes, but there was an excess of males in some of the samples.