T
Terrence A. Spencer
Researcher at University of Nebraska–Lincoln
Publications - 16
Citations - 1066
Terrence A. Spencer is an academic researcher from University of Nebraska–Lincoln. The author has contributed to research in topics: Genetically modified maize & European corn borer. The author has an hindex of 12, co-authored 16 publications receiving 997 citations.
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Journal ArticleDOI
Monarch larvae sensitivity to Bacillus thuringiensis- purified proteins and pollen
Richard L. Hellmich,Blair D. Siegfried,Mark K. Sears,Diane E. Stanley-Horn,Michael J. Daniels,Heather R. Mattila,Terrence A. Spencer,Keith J. Bidne,Leslie C. Lewis +8 more
TL;DR: Results from the other types of Bt corn suggest that pollen from the Cry1Ab and Cry1F, and experimental Cry9C hybrids, will have no acute effects on monarch butterfly larvae in field settings, and pollen contaminants, an artifact of pollen processing, can dramatically influence larval survival and weight gains and produce spurious results.
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Increased survival of western corn rootworm on transgenic corn within three generations of on-plant greenhouse selection
Lisa N. Meihls,Matthew L. Higdon,Blair D. Siegfried,Nicholas J. Miller,Thomas W. Sappington,Mark R. Ellersieck,Terrence A. Spencer,Bruce E. Hibbard +7 more
TL;DR: The results suggest that rapid response to selection is possible in the absence of mating with unexposed beetles, emphasizing the importance of effective refuges for resistance management.
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Baseline susceptibility of western corn rootworm (Coleoptera: Crysomelidae) to Cry3Bb1 Bacillus thuringiensis toxin.
TL;DR: It is suggested that the observed susceptibility differences reflect natural variation in Bt susceptibility among rootworm populations and provide a baseline for estimating potential shifts in susceptibility that might result from selection and exposure to Cry3Bb1-expressing corn hybrids.
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Inheritance of Cry1F resistance, cross-resistance and frequency of resistant alleles in Spodoptera frugiperda (Lepidoptera: Noctuidae).
Ana María Vélez,Terrence A. Spencer,Analiza P. Alves,D. Moellenbeck,R. L. Meagher,H. Chirakkal,Blair D. Siegfried +6 more
TL;DR: Transgenic maize, Zea maize L., expressing the Cry1F protein from Bacillus thuringiensis has been registered for Spodoptera frugiperda control since 2003, and bioassays of the backcross of the F1 generation crossed with the resistant parental strain suggest that a single locus is responsible for resistance.
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Inheritance of resistance to the Cry1Ab Bacillus thuringiensis toxin in Ostrinia nubilalis (Lepidoptera: Crambidae).
TL;DR: The polygenic nature of resistance in these two laboratory strains suggests that major genes for resistance to Cry1Ab were not common in the founding populations of O. nubilalis, which might be an important factor in delaying evolution of resistance to Bt corn in this pest.