Growing Switchgrass in the Corn Belt: Barriers and Drivers from an Iowa Survey

2018 ◽  
pp. 125-144
Author(s):  
Sarah Varble ◽  
Silvia Secchi
Keyword(s):  
Corn Belt

Corn Yields, Soil Temperature, and Water Use with Four Tillage Methods in the Western Corn Belt 1

1970 ◽  
Vol 62 (2) ◽  
pp. 229-232 ◽  
Author(s):  
Tamlin C. Olson ◽  
LaVern S. Schoeberl
Keyword(s):  
Soil Temperature ◽  
Water Use ◽  
Corn Belt ◽  
Tillage Methods

Defoliation Effects on Corn Hybrids Adapted to the Northern Corn Belt 1

1977 ◽  
Vol 69 (3) ◽  
pp. 387-390 ◽  
Author(s):  
D. R. Hicks ◽  
W. W. Nelson ◽  
J. H. Ford
Keyword(s):  
Corn Belt ◽  
Corn Hybrids

Farm-Level Economic and Environmental Impacts of Eastern Corn Belt Cropping Systems

jpa ◽  
1993 ◽  
Vol 6 (2) ◽  
pp. 290-296 ◽  
Author(s):  
John C. Foltz ◽  
John G. Lee ◽  
Marshall A. Martin
Keyword(s):  
Environmental Impacts ◽  
Cropping Systems ◽  
Corn Belt ◽  
Farm Level

scholarly journals Estimation of Cry3Bb1 resistance allele frequency in field populations of western corn rootworm using a genetic marker

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alan Willse ◽  
Lex Flagel ◽  
Graham Head
Keyword(s):  
Allele Frequency ◽  
Western Corn Rootworm ◽  
Allele Frequencies ◽  
Chromosome 8 ◽  
Corn Belt ◽  
Corn Rootworm ◽  
Resistance Allele ◽  
Response To Selection ◽  
The Us ◽  
Causal Allele

Abstract Following the discovery of western corn rootworm (WCR; Diabrotica virgifera virgifera) populations resistant to the Bacillus thuringiensis (Bt) protein Cry3Bb1, resistance was genetically mapped to a single locus on WCR chromosome 8 and linked SNP markers were shown to correlate with the frequency of resistance among field-collected populations from the US Corn Belt. The purpose of this paper is to further investigate the relationship between one of these resistance-linked markers and the causal resistance locus. Using data from laboratory bioassays and field experiments, we show that one allele of the resistance-linked marker increased in frequency in response to selection, but was not perfectly linked to the causal resistance allele. By coupling the response to selection data with a genetic model of the linkage between the marker and the causal allele, we developed a model that allowed marker allele frequencies to be mapped to causal allele frequencies. We then used this model to estimate the resistance allele frequency distribution in the US Corn Belt based on collections from 40 populations. These estimates suggest that chromosome 8 Cry3Bb1 resistance allele frequency was generally low (<10%) for 65% of the landscape, though an estimated 13% of landscape has relatively high (>25%) resistance allele frequency.

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