Table of Contents Author Guidelines Submit a Manuscript
International Journal of Agronomy
Volume 2016 (2016), Article ID 1848723, 7 pages
http://dx.doi.org/10.1155/2016/1848723
Research Article

Fungicides and Application Timing for Control of Early Leafspot, Southern Blight, and Sclerotinia Blight of Peanut

1Texas A&M AgriLife Research and Extension Center, 10345 State Highway 44, Corpus Christi, TX 78406, USA
2Texas A&M AgriLife Research and Extension Center, 1102 East FM 1294, Lubbock, TX 79403, USA
3Department of Plant and Soil Science, Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA

Received 18 January 2016; Accepted 19 September 2016

Academic Editor: Kassim Al-Khatib

Copyright © 2016 W. James Grichar and Jason E. Woodward. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Field studies were conducted in 2013 and 2014 in south Texas near Yoakum and from 2008 to 2011 in central Texas near Stephenville to evaluate various fungicides for foliar and soilborne disease control as well as peanut yield response under irrigation. Control of Sclerotinia blight caused by Sclerotinia minor Jagger with penthiopyrad at 1.78 L/ha was comparable to fluazinam or boscalid; however, the 1.2 L/ha dose of penthiopyrad did not provide consistent control. Peanut yield was reduced with the lower penthiopyrad dose when compared with boscalid, fluazinam, or the high dose of penthiopyrad. Control of early leaf spot, caused by Cercospora arachidicola S. Hori or southern blight, caused by Sclerotium rolfsii Sacc., with penthiopyrad in a systems approach was comparable with propiconazole, prothioconazole, or pyraclostrobin systems and resulted in disease control that was higher than the nontreated control. Peanut yield was also comparable with the penthiopyrad, propiconazole, prothioconazole, or pyraclostrobin systems and reflects the ability of the newer fungicides to control multiple diseases found in Texas peanut production.