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1 May 2008 Effects of Gibberellic Acid on Biological Parameters of the Larval Endoparasitoid Apanteles galleriae (Hymenoptera: Braconidae)
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Abstract

The impact of the plant growth regulator gibberellic acid (GA3) on parasitoid development and reproduction was examined using the endoparasitoid Apanteles galleriae Wilkinson (Hymenoptera: Braconidae). The effects of GA3 were assessed by rearing A. galleriae on hosts fed the growth regulator and then measuring a several life history traits: developmental time from egg to adult, adult longevity, body sizes, fecundity, and sex ratios. GA3 treatment yielded dose-dependent changes in adult longevity and duration of development. For example, at GA3 doses >10 ppm, the life span of both male and female adult wasps decreased by 19–23 d in comparison with parasitoids that developed on GA3-free hosts. Likewise, the length of development from egg to adult emergence significantly increased when A. galleriae developed on hosts fed the growth regulator at doses >200 ppm. In contrast, GA3 did not seem to alter adult body sizes, sex ratios, or fecundity, with the exception that F2 progeny production decreased by >40% at high concentrations (≥200 ppm). The potential significance of plant growth regulators on natural enemies used in integrated pest management programs is discussed.

Fevzı Uçkan, Aylın Tüven, Aylın Er, and Ekrem Ergın "Effects of Gibberellic Acid on Biological Parameters of the Larval Endoparasitoid Apanteles galleriae (Hymenoptera: Braconidae)," Annals of the Entomological Society of America 101(3), 593-597, (1 May 2008). https://doi.org/10.1603/0013-8746(2008)101[593:EOGAOB]2.0.CO;2
Received: 21 January 2007; Accepted: 1 December 2007; Published: 1 May 2008
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