Resumo

CRUZ CARRILLO, Anastasia; RODRIGUEZ MOLANO, Carlos E  e  ORTIZ LOPEZ, Carlos. In vitro insecticidal effect of the ethanolic extract from some plants on the adult fly Haematobia irritans. Rev Cubana Plant Med [online]. 2011, vol.16, n.3, pp. 216-226. ISSN 1028-4796.

Introduction: the constant development of resistance to several groups of insecticides marketed worldwide in the fields of agriculture and livestock breeding has led to the urgent search of new alternatives to control insects in a safe way for the ecosystem, the animals and the man. Several plants with insecticidal effect have been recognized in herbal medicine, although they have not been fully studied. Objectives: to determine the insecticidal effect of ethanolic extracts from five plants, that is, Ambrosia cumanensis Kunth, Bidens pilosa L., Brugmansia arborea (L.) Lagerth., Sambucus nigra L. and Nicotiana tabacum L. on the adult fly Haematobia irritans. Methods: the extracts were obtained using the Soxhlet extraction methods and then concentrated by the rotoevaporator Buchi; additionally, the secondary metabolites responsible for the insecticidal effect were identified with preliminary qualitative evaluations and confirmed through thin-layer chromatography. The flies were captured from cattle having natural parasites. Results: after sprinkling the flies with the diluted extracts, the highest insecticidal activity was found in Nicotiana tabacum, with a mortality rate of 100, 96.6, 80 and 60 % at dilution ratios of 5:10; 2.5:10; 1,25:10 and 0.62:10 respectively, followed by Brugmansia arborea and Sambucus nigra. The extracts from Bidens pilosa and Ambrosia cumanensis showed the lowest effectiveness. Conclusions: under the suggested conditions in this study, it was proved that the five plants had some insecticidal effect on fly Haematobia irritans, but at different levels of effectiveness.

Palavras-chave : Ambrosia cumanensis; Bidens pilosa; Brugmansia arborea; Sambucus nigra; Nicotiana tabacum; insecticide.

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