Suppression of Sclerotinia Blight of Peanuts with Dinitrophenol Herbicides

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Abstract
Dinoseb and Dyanap incorporated into potato dextrose agar at 1 .mu.g/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 [4-[2,4-dichlorophenoxy] butyric acid] at 25 .mu.g/ml. Growth of S. minor after 192 h of incubation was not restricted on media containing benefin, vernolate, alachor, or naptalam at 25 .mu./ml. Field applications of dinoseb or Dyanap significantly reduced the severity of Sclerotinia blight in peanuts (Arachis hypogaea cv. Virginia 72R) 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.

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