Non-persistent, natural, contact insecticides, extracted from plants (e.g. pyrethrum).
(Chrysanthemum cineranaefolium, C. roseum, C. cerneum). Also used as therapeutic
agents against external insects and parasites.
Animals most affected
Fish, dogs, (cattle).
Extensive pollution as a result of poor treatment methods, careless application or
following aquatic larvicidal treatment (fish). Ingestion of the agricultural product
Photosensitive, photolabile products which are unstable compounds. Highly toxic to
fish. Of low toxicity to birds and mammals as the active compound is rapidly degraded
in the stomach to non-toxic components.
Oral doses in mg/kg:
Relatively non-specific but neuromuscular and gastrointestinal effects predominate:
motor incoordination, clonic convulsions, stiffness of the hind quarters.
Respiratory and cardiac effects often very intense and pronounced:
tachycardia, cardiac fibrillation possible.
Death due to respiratory failure.
Non-specific: hepatic and renal degeneration
No antidote. Symptomatic care only, promote excretion:
adsorbents (activated vegetable charcoal);
tranquillizers, sedatives if indicated.
It is essential to have very fresh samples as the compounds degrade rapidly.