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1 May 2005 Effects of Vitamin E Concentrations on Sex Ratio of Pimpla turionellae (Hymenoptera: Ichneumonidae) Adults
M. Coşkun, P. Özalp, İskender Emre
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We report here the effects of vitamin E concentrations (0.0010%, 0.0015% and 0.0020%) in artificial diets on adult emergence and sex ratios of emerging adults of the parasitic wasp, Pimpla turionellae L. (Hymenoptera: Ichneumonidae). We found that average adult emergence was not affected by the absence or presence of vitamin E at the concentrations tested in the diet. However, the sex ratio differed significantly from a 1:1 ratio, favoring females, at 0.0010% and 0.0015%. A maximum of 65.63% females occurred at the 0.0015% level. When emergence and sex ratio data were viewed on a periodic basis between 10 and 34 d of age of the parasitizing parental females, considerable variation occurred but did not obscure the overall results. The dramatic decrease in the percentage of females emerging in the control and 0.0020% groups beginning on day 19 explains why the overall sex ratio in these two groups did not differ from 1:1. The only additional trend was an apparent decrease in adult emergence toward the end of the experimental period at the 0.0020% level

M. Coşkun, P. Özalp, and İskender Emre "Effects of Vitamin E Concentrations on Sex Ratio of Pimpla turionellae (Hymenoptera: Ichneumonidae) Adults," Annals of the Entomological Society of America 98(3), 336-339, (1 May 2005).[0336:EOVECO]2.0.CO;2
Received: 30 July 2004; Accepted: 1 January 2005; Published: 1 May 2005

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adult emergence
Pimpla turionellae
sex ratio
vitamin E
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