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High susceptibility and low resistance allele frequency of Chrysodeixis includens (Lepidoptera: Noctuidae) field populations to Cry1Ac in Brazil
Pest management science, 2016-08, Vol.72 (8), p.1578-1584
Yano, Silvia AC
Specht, Alexandre
Moscardi, Flávio
Carvalho, Renato A
Dourado, Patrick M
Martinelli, Samuel
Head, Graham P
Sosa-Gómez, Daniel R
2016
Details
Autor(en) / Beteiligte
Yano, Silvia AC
Specht, Alexandre
Moscardi, Flávio
Carvalho, Renato A
Dourado, Patrick M
Martinelli, Samuel
Head, Graham P
Sosa-Gómez, Daniel R
Titel
High susceptibility and low resistance allele frequency of Chrysodeixis includens (Lepidoptera: Noctuidae) field populations to Cry1Ac in Brazil
Ist Teil von
Pest management science, 2016-08, Vol.72 (8), p.1578-1584
Ort / Verlag
Chichester, UK: John Wiley & Sons, Ltd
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Wiley Online Library - AutoHoldings Journals
Beschreibungen/Notizen
BACKGROUND The soybean looper (SBL), Chrysodeixis includens (Walker), is one of the most important soybean pests in Brazil. MON 87701 × MON 89788 soybean expressing Cry1Ac has been recently deployed in Brazil, providing high levels of control against the primary lepidopteran pests. To support insect resistance management (IRM) programmes, the baseline susceptibility of SBL to Cry1Ac was assessed, and the resistance allele frequency was estimated on the basis of an F2 screen. RESULTS The toxicity (LC50) of Cry1Ac ranged from 0.39 to 2.01 µg mL−1 diet among all SBL field populations collected from crop seasons 2008/09 to 2012/13, which indicated approximately fivefold variation. Cry1Ac diagnostic concentrations of 5.6 and 18 µg mL−1 diet were established for monitoring purposes, and no shift in mortality was observed. A total of 626 F2 family lines derived from SBL collected from locations across Brazil during crop season 2014/15 were screened for the presence of Cry1Ac resistance alleles. None of the 626 families survived on MON 87701 × MON 89788 soybean leaf tissue (joint frequency 0.0004). CONCLUSIONS SBL showed high susceptibility and low resistance allele frequency to Cry1Ac across the main soybean‐producing regions in Brazil. These findings meet important criteria for effective IRM strategy. © 2015 Society of Chemical Industry
Sprache
Englisch
Identifikatoren
ISSN: 1526-498X
eISSN: 1526-4998
DOI: 10.1002/ps.4191
Titel-ID: cdi_crossref_primary_10_1002_ps_4191
Format
–
Schlagworte
Animals
,
baseline susceptibility
,
Brazil
,
Chrysodeixis
,
Cry1Ac
,
Endotoxins - genetics
,
Gene Frequency
,
Glycine max - genetics
,
Hemolysin Proteins - genetics
,
Insecticides
,
Larva - physiology
,
Lepidoptera
,
Moths - physiology
,
Noctuidae
,
Pest control
,
Pest Control, Biological
,
Plant Leaves - genetics
,
Plant resistance
,
Plants, Genetically Modified
,
resistance allele frequency
,
soybean looper
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