Selective herbicides, very widely used in the UK and in Europe.
Animals most affected
Cattle, sheep, dogs.
Direct ingestion of the agrochemical product or of recently treated vegetation.
There is also a risk of poisoning by plants: this occurs through repeated use
of triazines in areas of monoculture (such as maize). This widespread practice has
resulted in the emergence of plants or weeds (deadly nightshade, dog's mercury, amaranth)
resistant to the chemical, leading to a situation where hay or silage can be contaminated
with 10-40% of these plants that are themselves toxic to animals. It is currently
a very serious problem.
Compounds in this category
Ametryn, anilazine, atrazine, cyanazine, desmetryn, metamitrone, metribuzin, pro-metryn,
secbumeton, simazine, terbumeton, terbuthylazine, terbutryn.
Generally not considered to be very toxic. For toxic doses, see entries for individual
Few specific characteristics:
anorexia, dyspnoea with coughing;
muscle atonia, occasionally accompanied by trembling, locomotor ataxia, weakness
risk of hyperexcitability;
salivation, diarrhoea, loss of weight possible.
Generally good prognosis, rarely fatal.
Non-specific and not pronounced:
gastrointestinal and pulmonary congestion;
cardiac haemorrhages, also apparent the liver and kidneys.
No antidote. Symptomatic care only:
adsorbents (activated vegetable charcoal);
gastric demulcents if indicated;
tranquillizers, sedatives if necessary
Important to have extremely fresh samples for analysis.