Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

What if Chlorothalonil is short this season for Leafspot control?

Posted by romeethredge on March 17, 2015

  • There are a number of reports suggesting that chlorothalonil (sold under many brand names to include Bravo, Echo, Equus, Chloronil, etc,) will be in short supply in 2015.  As chlorothalonil is an important fungicide for management of leaf spot diseases of peanut, a shortage could have a significant effect.  Below are some recommendations from Dr. Bob Kemerait, UGA Extension, for dealing with challenges that could occur.

    • The first two applications of chlorothalonil (30 and 40 DAP, days after planting) can be removed IF Proline, 5.7 lf oz/A is banded at approximately 35 DAP and a Provost program is initiated at 60 DAP.  The first two chlorothalonil applications can also be omitted if Priaxor is used on the crop approximately 45 DAP.

    • Chlorothalonil can be extended by tank mixing a reduced rate (e.g. 1.0 pt/A rather than 1.5 pt/A) with 2 fl oz/A Tilt/Bumper, 5 fl oz/A Topsin-M, or Alto, 5 fl oz/A.

    • Tilt-Bravo or Echo-Propimax can be substituted for chlorothalonil.

    • An application of Elast (15 ozs/A) can be used to replace an application of chlorothalonil.

    • For a SINGLE application during a season, Topsin-M, 10 fl oz/A, can replace an application chlorothalonil.

    • Absolute (trifloxystrobin + tebucoanzole) and Stratego (trifloxystrobin + propiconazole) can be substituted for chlorothalonil.

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