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Suppression of Sclerotinia Blight of Peanuts with Dinitrophenol Herbicides. D. M. Porter, Plant Pathologist, AR, SEA, USDA, Tidewater Research and Continuing Education Center, Holland Station, Suffolk, VA 23437; O. E. Rud, Plant Physiol., Dept. Plant Pathol., and Physiol., VPI&SU, Tidewater Research and Continuing Education Center, Holland Station, Suffolk, VA 23437. Phytopathology 70:720-722. Accepted for publication 17 January 1980. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1980. DOI: 10.1094/Phyto-70-720.

Dinoseb and Dyanap incorporated into potato dextrose agar at 1 μg/ml significantly reduced mycelial growth of Sclerotinia minor, the causal agent of Sclerotinia blight of peanut. Mycelial growth also was reduced on media containing 2,4-DB at 25 μg/ml. Growth of S. minor after 192 hr of incubation was not restricted on media containing benefin, vernolate, alachor, or naptalam at 25 μg/ml. Field applications of dinoseb or Dyanap significantly reduced the severity of Sclerotinia blight in peanuts (Arachis hypogaea) when applied at postemergence but not when applied only at seedling emergence. Dinoseb reduced disease severity more than Dyanap. Peanut pod yields were greater in plots receiving postemergent treatments of dinoseb or Dyanap than in plots treated at seedling emergence. Peanut crop values was about 23% greater in plots treated at postemergence with dinoseb or Dyanap than in nontreated plots.

Additional keywords: Sclerotinia sclerotiorum, soilborne disease, disease control, dinoseb, Dyanap.