Peanut Leaf Spot & Disease Update

Twin Row Peaunuts 011

Here are some peanuts that are looking very good and now flowering. I also saw a few leaves with what appear to be early leaf spot showing up. We are now starting to think about our fungicide programs. Mitchell County Agent, Andy Shirley, posted good information about spray schedules on his blog: Peanut Spray Schedules.

Peaunuts - Leaf Spot013

Also, there have been some reports of a shortage of Chlorothalonil (Bravo, Echo, Chloranil, and others) this season.  Here are some recent comments from UGA Extension Plant Pathologist, Dr. Bob Kemerait, on the current Peanut Disease control situation:

You may hear reports that chlorothalonil could be in short supply this season.  For now, growers should be assured that although chlorothalonil is an important fungicide, our peanut leaf spot programs are in no way compromised.  Here are some suggestions as to how to manage if chlorothalonil supply is short this season:

1. Current conditions (warm weather with developing afternoon thunderstorms) create favorable conditions for leaf spot diseases and white mold.

2.  Here are our UGA strategies for dealing with the shortage of chlorothalonil in peanut production:

  • Consider using a strong leaf spot fungicide like “Headline” (9 fl oz/a, 45 days after planting) to initiate an excellent leaf spot program and to replace potentially 2 applications of chlorothalonil (30 and 44 days after planting).
  • Reduce the rate of chlorothalonil used in a leaf spot applications by partnering with another fungicide.  Examples include mixing chlorothalonil (1 pt/A) with Tilt (propiconazole, 2 fl oz/A) or  Alto (cyproconazole, 5.5 fl oz/A) or Topsin-M (5 fl oz/A).
  • PEANUT Rx: Using “prescription” fungicide programs based upon risk assessment in the field may also be an excellent strategy to reduce use of fungicides in general

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