Sex ratio and reproductive success in the pine beauty moth, Panolis flammea (Den. et Schiff.) (Lepidoptera, Noctuidae)
1990
Leather, S.R. (Northern Research Station, Roslin (UK). Forestry Commission)
When sex ratio was manipulated in the pine beauty moth, Panolis flammea it was found that in terms of fecundity the optimal sex ratio was 1 female : 3 males. Sex ratio had no significant effects on the pre-oviposition period or the life span of adult fed female P. flammea. Egg fertility however, was greatest in those eggs produced by mated females from 1 : 1 sex ratio. When males were outnumbered by females by 1 : 3, egg fertility was greater (55 per cent) than in the reverse situation (42 per cent). At ratios of 5 : 1 in either bias, fertility was much reduced. These results are discussed in light of the natural population structure of this insect and the implications for pest management are considered
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