Management of Leaf Spot Diseases of Peanut With Prothioconazole Applied Alone or in Combination With Tebuconazole or Trifloxystrobin

Culbreath, A.K. and Kemerait Jr., R.C. and Brenneman, T.B. (2008) Management of Leaf Spot Diseases of Peanut With Prothioconazole Applied Alone or in Combination With Tebuconazole or Trifloxystrobin. Peanut Science, 35 (2). pp. 149-158.

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Field experiments were conducted in Tifton and Plains, GA in 2001–2007 to determine the efficacy of prothioconazole on early leaf spot (Cercospora arachidicola) and late leaf spot (Cercosporidium personatum) of peanut (Arachis hypogaea). In five of six experiments, application of one or both rates (0.18 and 0.20 kg ai/ha) of prothioconazole in sprays 3–6 (chlorothalonil at 1.26 kg ai/ha in sprays 1, 2, and 7) provided leaf spot control superior to tebuconazole (0.23 kg ai/ha) in a similar regime, and superior to chlorothalonil at 1.26 kg ai/ha applied full season (seven times) in four of six experiments. In a similar series of six experiments, application of 0.085 kg ai/ha of prothioconazole + 0.17 kg ai/ha of tebuconazole provided better leaf spot control than tebuconazole (0.23 kg ai/ha) applied in regimes similar to those described above. Leaf spot control with prothioconazole + tebuconazole was similar to chlorothalonil applied at 1.26 kg ai/ha full season in five of eight experiments, but was less effective in the remaining three experiments. Fungicide effects on yield were inconsistent, but in all experiments, yield response with either rate of prothioconazole was similar to or greater than that obtained with 0.23 kg ai/ha tebuconazole on the same schedule. In a third series of four experiments, full-season (seven sprays) application of mixtures of prothioconazole at 0.063 kg ai/ha with trifloxystrobin at 0.063 kg ai/ha gave similar or better leaf spot control than chlorothalonil full season.

Item Type: Article
Additional Information: This work was supported in part by the Georgia Agricultural Commodity Commission for Peanuts and Bayer CropScience. The essential efforts of Stephanie Danforth, Mike Heath, Ron Hooks, Allison McKeown, Jonathan Roberts and Kevin Welch are gratefully acknowledged.
Uncontrolled Keywords: triazolinthione fungicides, sterol biosynthesis inhibitors, Cercosporidium personatum, Cercospora arachidicola
Author Affiliation: Dept. of Plant Pathology, Univ. of Georgia, Coastal Plain Exp. Sta., Tifton, GA 31793-0748
Subjects: Crop Improvement
Plant Physiology and Biochemistry > Plant Physiology
Divisions: Groundnut
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 06 Mar 2013 14:51
Last Modified: 06 Mar 2013 14:51
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