Atrazine (most products containing atrazine are designated restricted-use)

Trade name(s) AAtrex, Atrazine

Manufacturer(s) Syngenta, Corteva, and others

Formulation(s) 80% wettable powder, 4 lb/gal liquid, 90% water-dispersible granule

Remarks A selective, root-absorbed herbicide. Some foliar absorption but with little translocation. Most plant tissue contacted by spray is injured. More soluble and less strongly adsorbed on soil than simazine; thus, less moisture is needed to activate it. More active on soils with high pH.

Water solubility 33 ppm

Storage conditions Very stable

Acute toxicity LD50 - 5,100 mg/kg

Action in plant Inhibits photosynthesis.

Site of action Group 5: photosystem II inhibitor

Chemical family Triazine

Koc Average is 100 mL/g