What are alachlor and atrazine?
Alachlor and atrazine are used as selective herbicides for controlling grasses and broadleaf weeds. They are usually applied to the soil surface either before or just after a crop has emerged. Alachlor is used mainly on corn and soybean fields, but also can be used in commercial nurseries. Atrazine is used mainly on corn fields. Alachlor is usually sold under the trade name “Lasso,” but other names include “Chimiclor,” “Alanox,” and “Pilarzo.” Atrazine is sold under the trade names “AAtrex” and “Azinotox 500.” Alachlor and atrazine also are components of other herbicide mixtures. Products containing alachlor and atrazine are classified as “restricted use” herbicides. Restricted use herbicides may only be used by certified applicators or under the supervision of a certified applicator. One reason the use of alachlor and atrazine has been restricted is because of concerns about groundwater contamination.
