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Callisto (4 lb ai mesotrione) - Syngenta Labeled in Indiana
There have been some changes to the Callisto label this year.  The first change has been to change the control of burcucumber from ‘partial control’ to ‘control’.  The label recommendations are 3 fl oz/A to be tank mixed with 0.25 lb ai/A atrazine with COC and AMS.  In a study done at Purdue University in North West Indiana, Callisto coupled with a preemergence of Dual II Mangum (7.64 lb s-metolachlor) or Lumax (2.68 lb s-metolachlor + 0.28 lb mesotrione + 1 lb atrazine) controlled burcucumber 91% or 96%, 29 days after treatment respectively[1].  Burcucumber is a vine that can germinate as late as August and still become a problem at harvest.  Callisto and atrazine provide some residual control of burcucumber, but complete success at harvest may also depend on environmental conditions and soil type.  Muck soils provide a challenge to all residual herbicides.  Unfortunately this is the case with several residual products that have activity on burcucumber.

A “tank mix with glyphosate” section has been added to the label for Roundup Ready (RR) corn.  This section allows the use of 3 fl oz/A of Callisto in a tank mix with glyphosate plus AMS at 8.5 to 17 lb/100 gals.  This section warns not to add COC or UAN to the tank mix if the glyphosate product has a premixed adjuvant.  If an adjuvant is required by the glyphosate product it is recommended to use 0.25% to 0.5% v/v NIS as the adjuvant.  Failure to follow these recommendations may lead to crop injury.
       
[1] Johnson, B.  2005.  Annual Research Report. Number 026.  [http://www.btny.purdue.edu/weedscience/resreport/BJ2005/04PC01.pdf]
       
Updated 1/8/09

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Callisto