Document Detail

Life history traits of Helicoverpa zea (Lepidoptera: Noctuidae) on non-Bt and Bt transgenic corn hybrids in eastern North Carolina.
MedLine Citation:
PMID:  11681693     Owner:  NLM     Status:  MEDLINE    
Transgenic varieties of field corn that express the CrylAb B. thuringiensis (Bt) toxin in ear tissue present the potential of reducing ear feeding by the corn earworm, Helicoverpa zea (Lepidoptera: Noctuidae), and for reducing the size of populations of the insect infesting other host crops. Life history parameters of H. zea feeding on ears of conventional and Bt field corn varieties were measured in field plots in eastern North Carolina in 1997 and 1998. Transformation events investigated were Mon-810 and Bt-11. Bt corn was found to cause a steady mortality of larvae during development, but permitted approximately 15-40% survival to the prepupal stage compared with non-Bt corn. Mortality of prepupae and pupae from Bt corn was also higher than from non-Bt corn, reducing overall adult production by 65-95%. The larvae that did survive grew more slowly on Bt than on non-Bt corn, and produced pupae that weighed 33% less. Pupation and adult eclosion were delayed by 6-10 d by feeding on Bt corn ears. Corn varieties expressing Bt in ear tissue have the potential to reduce H. zea ear feeding by up to 80%, and the potential to reduce populations emerging from ear-stage corn fields to infest cotton, soybean and other crops by around 75%. To have a measurable effect on area-wide populations, Bt corn varieties would need to be planted in large proportions of corn fields. Extensive planting of varieties such as those tested here, having only moderate effects on H. zea, would raise concerns about rapid evolution of resistance.
N P Storer; J W Van Duyn; G G Kennedy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of economic entomology     Volume:  94     ISSN:  0022-0493     ISO Abbreviation:  J. Econ. Entomol.     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2001-10-29     Completed Date:  2002-01-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985127R     Medline TA:  J Econ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1268-79     Citation Subset:  IM    
Department of Entomology, College of Agriculture and Life Sciences, North Carolina State University, Raleigh 27695-7613, USA.
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MeSH Terms
Bacillus thuringiensis* / genetics
Bacterial Proteins* / genetics
Bacterial Toxins* / genetics
Body Weight
Endotoxins* / genetics
Hemolysin Proteins
Larva / growth & development
Moths / growth & development*
North Carolina
Pest Control, Biological / methods*
Plants, Genetically Modified
Pupa / growth & development
Time Factors
Zea mays*
Reg. No./Substance:
0/Bacterial Proteins; 0/Bacterial Toxins; 0/Endotoxins; 0/Hemolysin Proteins; 0/insecticidal crystal protein, Bacillus Thuringiensis

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