Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19737
Tipo: Artigo
Título: Yield losses in transgenic Cry1Ab and non-Bt corn as assessed using a crop-life-table approach
Autor(es): Silva, Gerson A.
Picanço, Marcelo C.
Ferreira, Lino R.
Ferreira, Dalton O.
Farias, Elizeu S.
Souza, Thadeu C.
Rodrigues-Silva, Nilson
Pereira, Eliseu José G.
Abstract: In this study, we constructed crop life tables for Bacillus thuringiensis Berliner (Bt) Cry1Ab and non-Bt corn hybrids, in which yield-loss factors and abundance of predaceous arthropods were recorded during 2 yr at two locations. Corn kernel/grain was the yield component that had the heaviest losses and that determined the overall yield loss in the corn hybrids across years and locations. Yield losses in both corn hybrids were primarily caused by kernel-destroying insects. Helicoverpa zea (Boddie) and Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) were the key loss factors at one location, while at the other, the key loss factor was the silk fly larvae, Euxesta spp. (Diptera: Ulidiidae). Although the realized yield of corn grains was not different (P > 0.05) between Cry1Ab and non-Bt corn hybrids, the Bt corn hybrid reduced (P < 0.05) the damage by H. zea and S. frugiperda in three of the four field trials, particularly at the location where Lepidoptera were the key loss factors. As expected, no reduction in the abundance of predaceous arthropods was observed in Cry1Ab corn fields. Various species of natural enemies were recorded, particularly the earwig Doru luteipes (Scudder) (Dermaptera: Forficulidae), which was the most abundant and frequent predaceous insect. These results indicate that integration of pest management practices should be pursued to effectively minimize losses by kernel-destroying insects during corn reproductive stages when growing non-Bt or certain low-dose Bt corn cultivars for fall armyworm and corn earworm, such as those producing Cry1Ab or other Cry toxins.
Palavras-chave: Maize
Bt toxin
Corn earworm
Fall armyworm
Silk fly
Natural enemy
Editor: Journal of Economic Entomology
Tipo de Acesso: Open Access
URI: https://doi.org/10.1093/jee/tox346
http://www.locus.ufv.br/handle/123456789/19737
Data do documento: 20-Nov-2017
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