Page Banner

United States Department of Agriculture

Agricultural Research Service

Research Project: CONSERVATION, CHARACTERIZATION, AND EVALUATION OF CROP GENETIC RESOURCES AND ASSOCIATED INFORMATION

Location: Plant Genetic Resources Conservation Unit

Title: Response of progeny bred from Bolivian and North American cultivars in integrated management systems for leaf spot of peanut (Arachis hypogaea)

Authors
item Gremillion, S -
item Culbreath, A -
item Gorbet, D -
item Mullinix, B -
item Pittman, Roy
item Stevenson, K -
item Todd, J -
item Condori, M -

Submitted to: Crop Protection Journal
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: February 6, 2011
Publication Date: June 20, 2011
Citation: Gremillion, S., Culbreath, A., Gorbet, D., Mullinix, B., Pittman, R.N., Stevenson, K., Todd, J., Condori, M. 2011. Response of progeny bred from Bolivian and North American cultivars in integrated management systems for leaf spot of peanut (Arachis hypogaea). Crop Protection Journal. 30(6):698-704.

Interpretive Summary: The purpose of this work was to evaluate a Bolivian landrace ‘Bayo Grande’ and a series of breeding line progeny using two IDM systems. One consisted of a full and reduced spray fungicide regimes and the second consisted of a full and reduced spray fungicide regimes in combination with conventional and strip tillage treatment in field experiments over two years in the U.S. and Bolivia. Application of three or four sprays of tebuconazole on Bayo Grande and several of the progeny lines suppressed leaf spot to levels similar to those in susceptible cultivar Georgia Green to which full-season regimes were applied. Several of these new Bolivian-derived genotypes show promise for use in a reduced fungicide and/or strip tillage IDM system with the potential to lessen fungicide use compared to standard production practices while maintaining low leaf spot levels and high yields.

Technical Abstract: Early leaf spot caused by the fungus Cercospora arachidicola, and late leaf spot caused by the fungus Cercosporidium personatum, are major yield-reducing diseases of peanut (Arachis hypogaea L.) in the southeastern U.S. Effective control of both leaf spots can be reached with integrated disease management (IDM) systems utilizing cultivars with moderate levels of resistance to these pathogens. A Bolivian land-race cultivar, Bayo Grande, and a series of breeding line progeny were evaluated using two IDM systems; the first consisted of a full and reduced-spray fungicide regimes, and the second of a full and reduced-spray fungicide regimes in combination with conventional and strip (conservation) tillage treatments in field experiments over two years. Bayo Grande and progeny lines had better leaf spot resistance than the standard southeastern U.S. cultivar, Georgia Green. Application of three or four sprays of tebuconazole on Bayo Grande and several of the progeny lines suppressed leaf spot to levels similar to those in susceptible cultivar Georgia Green to which full-season regimes were applied. Strip tillage reduced the need for fungicides in most genotypes in one year, but it did not contribute to fungicide spray reduction between conventional and strip tillage in the following year. Yields were higher in Bayo Grande and the progeny lines compared to Georgia Green in three of the four experiments across both years. No reduced fungicide regime supported yields higher to those under the full season regime across experiments and years. Under strip tillage, yields of Bayo Grande and two of the progeny lines were negatively impacted in one year, and were overall lower in the other year. Several of these new Bolivian-derived genotypes show promise for use in a reduced fungicide and/or strip tillage IDM system with the potential to lessen fungicide use compared to standard production practices while maintaining low leaf spot levels and high yields.

Last Modified: 7/25/2014
Footer Content Back to Top of Page