Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: May 15, 2004
Publication Date: December 10, 2004
Citation: Chenault, K.D., Melouk, H.A. 2004. Effect of Sclerotinia minor infection location on the peanut plant on plant productivity [abstract]. In: Proceedings of the American Peanut Research and Education Society, July 13-16, 2004, San Antonio, Texas. 36:50. Technical Abstract: Sclerotinia blight, a soilborne fungal disease caused by Sclerotinia minor, is responsible for increased production costs and yield losses of up to 50% for peanut producers in the Southwest, North Carolina, and Virginia. Much has been reported on the pathology, epidemiology, and control of S. minor infection of peanut, but documentation of the physical location of infection on the plant under field conditions and its effect on plant productivity is lacking. A field study was initiated in 2002 at the Caddo Research Station near Ft. Cobb, OK, to study the effect of the physical location of S. minor infection on peanut yield and grade. The thirty-two peanut lines in this study were planted in plots with high sclerotial density to provide above average Sclerotinia pressure with no application of fungicide for management of S. minor. Location of initial Sclerotinia minor infection was noted as either "crown" or "limb" for each infected plant, and the date of initial onset was also recorded. In general, those plants with initial crown infections had more reduced yield and seed quality as compared to those with initial limb infections. Early date of initial infection had a similar effect on plant productivity as compared to late onset of infection. Early onset of crown infections had the greatest effect on plant productivity, causing a severe decrease in seed quality and yield.