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Effects of the essential oil obtained from Pilocarpus spicatus Saint-Hilaire (Rutaceae) on the development of Rhodnius prolixus nymphae

2007; Springer Science+Business Media; Volume: 17; Issue: 4 Linguagem: Inglês

10.1590/s0102-695x2007000400007

1981-528X

C.B. Mello, Cléber D. Uzeda, Marana V. Bernardino, Duclécio Mendonça-Lopes, Alphonse Kelecom, Paulo César Ayres Fevereiro, Marcelo S. Guerra, Adriana Passos Oliveira, Leandro Rocha, Marcelo Salabert Gonzalez,

Insect and Pesticide Research

Bioassays against fifth-instar nymphae of Rhodnius prolixus were conducted with essential oil of Pilocarpus spicatus extracted by hydrodistillation. The main results may be summarized as follows: (i) high levels of toxicity and paralysis together with discrete moulting inhibition were caused by topical application of either 0.5 µL or 1.0 µL per insect of the crude essential oil; (ii) partial fagoinhibition, high moulting inhibition, prolonged intermoulting period and high number of paralyzed insects, but no toxicity were observed after oral treatment using either 5 µL or 10 µL of Pilocarpus spilcatus essential oil per mL of ingested blood meal. The importance of these results in relation to the relevant biological events in R. prolixus is herein discussed.