Toxicity of Fastac 10 EC, a pyrethroid insecticide, to Paramecium primaurelia and Tubifex sp.

The pyrethroide, Fastac 10 EC was tested on the paramecia and Tubifex sp. The results showed that both tests are valid for estimation of the toxicity of the pesticide. However, the Paramecium test is more sensitive when one is investigating the direct toxicity of the compound. The great validity of the Tubifex test lies in the possibility of tracing the teratogenic effects of the pesticides.