Resumo

RAMIREZ A., Mauricio; CRUZ CARRILLO, Anastasia  e  RODRIGUEZ MOLANO, Carlos. PRELIMINARY SCREENING OF ETHANOLIC EXTRACTS OF FIVE MEDICINAL PLANTS AGAINST Haematobia irritans L. (DIPTERA: MUSCIDAE). rev.udcaactual.divulg.cient. [online]. 2009, vol.12, n.1, pp.69-78. ISSN 0123-4226.

The use of medicinal plants forms part of the medical history in every world culture, as well as of the popular customs, being also the starting point of traditional drugs. Responding to the high levels of resistance to chemical pesticides and the presence of their residues in the ecosystem, in plants, new alternatives for insect control have been searched. Based on the popular knowledge about some plants, recognized for their insecticidal action, with this research it was proposed to determine experimentally if Nicotiana tabacum, Brugmansia arborea, Sambucus nigra, Bidens pilosa and Ambrosia cumanenses have some action against the fly, Haematobia irritans, cattle pest of importance. Leaf extracts were prepared by lixiviation in cold and the insecticidal effect was evaluated in vitro making topical aspersion of the extracts on the flies. All plants show insecticidal effect but at different intensity levels. The extract of N. tabacum was the most effective one. With these results the popular knowledge is supported, however the need of using high concentrations of the extract for obtaining insecticide effect is pointed out.

Palavras-chave : Elder; tobacco; almatisa; datura; chipaca; horn fly; cattle pest.

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