In 2010, 34 acetochlor products were registered for sale in Minnesota (Table 2). Thirteen were acetochlor-only products and 21 were "pre-mix" combination products of acetochlor and other herbicides (Table 1). Not all acetochlor products registered for sale in Minnesota actually end up being sold in the state. For example, in 2007 sales were reported on 20 of the 34 products registered.
Concentration of acetochlor in 2010 registered acetochlor products range from 16.9% to 74.8% (Table 2). This is referred to as the active ingredient, or a.i., of an acetochlor product.
Minnesota registration information for acetochlor and other pesticide products is available through the Kelly Registration Systems or the National Pesticide Information Retrieval System. Examples of acetochlor product labels are available through the Crop Data Management Systems (CDMS). Note that pesticide product labels change over time. The only official product label is the label attached to the container of the pesticide being used.
The Minnesota Department of Agriculture (MDA) collects pesticide sales data to provide long-term trends in pesticide use. Sales data should not be used as an indicator of pesticide use in a given year as product bought one year may be held over and used the following year or be returned unused to the distributor.
In 2008, over 5 million pounds of acetochlor active ingredient was sold in Minnesota (Figure 1). Eighty percent of acetochlor sold in 2008 was acetochlor-only product and 20% was pre-mix combination products of acetochlor and another herbicide or herbicides. It is known through MDA interviews with pesticide applicators that a substantial amount of acetochlor product sold as acetochlor-only is subsequently combined with other herbicides before it is used.
Gregg Regimbal, Supervisor
Pesticide Management Unit