A triazine herbicide with residual and foliar activity representing the most widely used compound in this group of herbicides (employed for maize/corn, sorghum, sugar cane and in orchards). Available commercially in the form of concentrated suspensions, wettable (dispersible) powders, granules for mixing into water and other preparations.
There are groups of toxic plants which are resistant to atrazine (including deadly nightshade, dog's mercury) which may result in contamination of fodder material or silage. Where such contamination reaches 30% or above, there is a considerable risk of plant poisoning in livestock.
For etiology, treatment, clinical features and investigations, see Triazines.

[toxic.gif] Toxicity
Oral doses in mg/kg or concentrations in mg/l:

LD50 rats 2500 - 3000
  rabbits 750
LD cattle 250 for 2 days, or 25 for 8 days
  sheep 250 for 2 days, or 100 for 16 days
  chickens 4400
TD cattle 100 or 25 for 2 days
  sheep 100 or 5 for 10 days
  chickens 1100 or 50 for 10 days
  chicks 150 for 21 days
LD50 (96 h) fish 15-100

Note: ruminants appear to be more sensitive to atrazine than other types of animal.

[clinical.gif] Clinical features

[lesions.gif] Lesions

[case.gif] Case summaries
A farmer gave his herd of cattle a feed which had been accidentally sprayed with atrazine. All the animals presented with anorexia, salivation, mild excitement and colic. After 3 days of symptoms, the condition of the animals returned to normal.