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Developmental and mortality responses of Chilo partellus Swinhoe (Lepidoptera: Crambidae) and Sesamia calamistis Hampson (Lepidoptera: Noctuidae) following partial feeding on Bt-transgenic maize

Creator: Obonyo, D.N.
Creator: Lovei, G.L.
Creator: Songa, J.M.
Creator: Oyieke, F.A.
Creator: Mugo, S.N.
Creator: Nyamasyo, G.H.N.
Year: 2008
Language: English
Publisher: FACT Limited
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Place of Publication: (Kenya)
Pages: 554-563
Volume: 11
Keywords: Cry1Ab
Keywords: Environmental Biosafety
Keywords: GM Maize
Keywords: Stem Borers
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Description: Objective: To determine i) the susceptibility of different instars of Chilo partellus Swinhoe (Lepidoptera: Crambidae) and Sesamia calamistis Hampson (Lepidoptera: Noctuidae) to Bt maize (expressing Cry1Ab) and ii) the effects of transient feeding on Bt maize plants at the 3rd , 4th and 5th instars on the development of C. partellus and S. calamistis. Methodology and Results: First to 5th instars of C. partellus and S. calamistis were reared on non-Bt vs. Bt plant material for five days and larval mortality assessed. For the development study, 3rd, 4th and 5th instars of C. partellus and S. calamistis were fed on Bt maize stems for 24h, then reared on non-Bt maize stems, and development monitored. Controls were fed on non-Bt maize only. The 1st instars were more susceptible to the Bt plants than the later instar stages. The duration of most stem borer instars were significantly prolonged at the instar at which feeding on Bt maize took place. Conclusion and application of findings: Third to 5th stem borer instars, which are the preferred hosts of larval parasitoids, are less susceptible to Bt delta endotoxins. It is therefore likely that larval parasitoids would be exposed to Bt toxins via their hosts. The prolongation of development time of the insect pests as a result of feeding on Bt maize could result in increased attack rates by parasitoids due to increase in the ‘window of vulnerability’, the period during which the host is exposed to natural enemies. The combined effects of developmental delays may also result in temporal asynchrony of stem borer moths produced from Bt and non-Bt maize, a factor that would need to be considered in designing resistance management strategies.
Agrovoc: MAIZE
ISSN: 1997 – 5902
Journal: Journal of Applied Biosciences

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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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