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Field-evolved resistance to Cry1Ab maize by Spodoptera frugiperda in Brazil
Pest management science, 2016-09, Vol.72 (9), p.1727-1736
Omoto, Celso
Bernardi, Oderlei
Salmeron, Eloisa
Sorgatto, Rodrigo J
Dourado, Patrick M
Crivellari, Augusto
Carvalho, Renato A
Willse, Alan
Martinelli, Samuel
Head, Graham P
2016
Details
Autor(en) / Beteiligte
Omoto, Celso
Bernardi, Oderlei
Salmeron, Eloisa
Sorgatto, Rodrigo J
Dourado, Patrick M
Crivellari, Augusto
Carvalho, Renato A
Willse, Alan
Martinelli, Samuel
Head, Graham P
Titel
Field-evolved resistance to Cry1Ab maize by Spodoptera frugiperda in Brazil
Ist Teil von
Pest management science, 2016-09, Vol.72 (9), p.1727-1736
Ort / Verlag
Chichester, UK: John Wiley & Sons, Ltd
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
BACKGROUND The first Bt maize in Brazil was launched in 2008 and contained the MON 810 event, which expresses Cry1Ab protein. Although the Cry1Ab dose in MON 810 is not high against fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith), MON 810 provided commercial levels of control. To support insect resistance management in Brazil, the baseline and ongoing susceptibility of FAW was examined using protein bioassays, and the level of control and life history parameters of FAW were evaluated on MON 810 maize. RESULTS Baseline diet overlay assays with Cry1Ab (16 µg cm−2) caused 76.3% mortality to field FAW populations sampled in 2009. Moderate mortality (48.8%) and significant growth inhibition (88.4%) were verified in leaf‐disc bioassays. In greenhouse trials, MON 810 had significantly less damage than non‐Bt maize. The surviving FAW larvae on MON 810 (22.4%) had a 5.5 day increase in life cycle time and a 24% reduction in population growth rate. Resistance monitoring (2010–2015) showed a significant reduction in Cry1Ab susceptibility of FAW over time. Additionally, a significant reduction in the field efficacy of MON 810 maize against FAW was observed in different regions from crop season 2009 to 2013. CONCLUSIONS The decrease in susceptibility to Cry1Ab was expected, but the specific contributions to this resistance by MON 810 maize cannot be distinguished from cross‐resistance to Cry1Ab caused by exposure to Cry1F maize. Technologies combining multiple novel insecticidal traits with no cross‐resistance to the current Cry1 proteins and high activity against the same target pests should be pursued in Brazil and similar environments. © 2015 Society of Chemical Industry
Sprache
Englisch
Identifikatoren
ISSN: 1526-498X
eISSN: 1526-4998
DOI: 10.1002/ps.4201
Titel-ID: cdi_proquest_miscellaneous_1807079089
Format
–
Schlagworte
Animals
,
Bacillus thuringiensis
,
Bacillus thuringiensis - genetics
,
Bacterial Proteins - pharmacology
,
Biological Evolution
,
Brazil
,
Bt maize
,
Corn
,
Cry1Ab protein
,
Endotoxins - pharmacology
,
fall armyworm
,
Hemolysin Proteins - pharmacology
,
insect resistance management
,
Insecticide Resistance
,
Insecticides
,
Insecticides - pharmacology
,
Larva - drug effects
,
Larva - growth & development
,
Larva - physiology
,
Plant resistance
,
Plants, Genetically Modified - genetics
,
Protein expression
,
Spodoptera - drug effects
,
Spodoptera - growth & development
,
Spodoptera - physiology
,
Spodoptera frugiperda
,
Zea mays
,
Zea mays - genetics
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