A soil-acting triazine herbicide with selective and non-selective uses. Widely used for maize (corn), grapevines, fruit trees and orchards. Available commercially in the form of concentrated suspensions, wettable (dispersible) powders, granules, micro-granules, alone or in combination with other chemicals (e.g. amitrole, diquat, 2,4-D, glyphosate).
Note:the systematic use of the chemical on maize has resulted in some parasitic weeds (dog's mercury, black nightshade) developing a resistance to the herbicide. This in turn has started to lead to very significant contamination of fodder and silage with weed contamination levels reaching 30-40% of the weight of fresh hay.

[toxic.gif] Toxicity

Oral doses in mg/kg or concentrations mg/l:
LD50 rats, rabbits in excess of 5000
  pigeons, chickens in excess of 5000
LD chickens 250 for 8 days
  cattle 100
  sheep 500
  sheep 400 for 6 days
    100 for 14 days
TD cattle 25 for 3-10 days
  sheep 50 for 17 days
  chickens 50 for 10 days
LC50 (96 h) fish 50

Note: it has been observed that ruminants are more sensitive to simazine than other species.

[clinical.gif] Clinical features

[lesions.gif] Lesions