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fluridone (Sonar) NYS DEC Letter - Major Change in Labeling 7/97



New York State Department of Environmental Conservation
Division of Solid & Hazardous Materials
Bureau of Pesticides & Radiation
Pesticide Product Registration Section 
50 Wolf Road, Albany, New York 12233-7257 
Phone 518-457-7446	FAX 518-485-8990


July 8, 1997


Certified Mail
Return Receipt Requested


Steve D. Cockreham, Ph.D.
Director of Research and Regulatory Affairs 
SePRO Corporation
11550 North Meridian Street 
Carmel, IN 46032


Dear Dr. Cockreham:


RE:  SONAR A.S. (SLN No. NY-950002, EPA Reg. No. 67690-4), Amended Label Constituting a 
     Major Change in Labeling


The New York State Department of Environmental Conservation has reviewed the referenced 
application for amended labeling, submitted on April 8, 1997, as well as the subsequent 
revised labeling submitted on June 30, 1997 in response to the concerns expressed in our 
letter of June 23, 1997.


The purpose of the proposed label changes is to allow for partial treatment of lakes at 
reduced rates (< 50 ppb) and to prescribe refined application techniques. Generally, the 
goal is to maintain the lowest effective concentrations in lakes ponds and reservoirs for
the time period necessary for control of target weeds. Specifically, the changes:


  -  Remove limitation of whole lake treatment when applying at lower rates i.e. less 
     than 50 ppb.


  -  Allow for multiple/split applications in treatment areas of lakes and reservoirs 
     within 1/4 mile of potable water intakes provided that concentrations do not exceed 20
     ppb fluridone at any time and the sum of all applications in one annual growth cycle does 
     not exceed 150 ppb.


  -  Allow for multiple/split applications in treatment areas of lakes and reservoirs 
     greater than l/4 mile of potable water intakes provided that concentrations do not 
     exceed 50 ppb fluridone at any time and the sum of all applications in one annual 
     growth cycle does not exceed 150 ppb.


The revised labeling adequately responds to our label wording concerns and the application 
is acceptable. Enclosed, is a copy of the stamped "accepted" label for your files.


If you have any questions regarding the above, contact Frank Hegener, of my office, at 
(518)457-7446.


Sincerely,
 
Maureen P. Serafini 
Supervisor, Pesticide Product 
Registration Section