Resumo

CASTILLO-SANCHEZ, Luis Enrique; JIMENEZ-OSORNIO, Juan José  e  DELGADO-HERRERA, María América. The in vitro biological activity of Capsicum chinense Jacq extract against Bemisia tabaci Genn. Rev. Chapingo Ser.Hortic [online]. 2012, vol.18, n.3, pp.345-356. ISSN 2007-4034.  https://doi.org/10.5154/r.rchsh.2011.04.016.

Over the last 30 years, plant extracts have been used against several phytophagous insect species, gaining importance as alternatives for pest control, because they do not affect the environment and are friendly to phytophagous insects' natural enemies. In the present work, the insecticidal and repellent effects of C. chinense extract against B. tabaci adults were appraised. Repellency and mortality bioassays were performed using a flask (150 mm) with different concentrations of capsaicinoids extracted from habanero peppers (Capsicum chinense), local orange variety. A random experimental design was used with an 8 X 7 factorial arrangement for the mortality bioassay, and an 8 x 8 factorial arrangement for the repellency effect, with four replications per treatment. Concentrations of 30 and 40 % of the extract showed a higher mortality effect than others. Concerning the repellency, treatments >30 % of extract showed a higher repellency compared to other treatments. The results showed that C. chinense has a repellent effect during the first hour of exposure against B. tabaci.

Palavras-chave : Bioassays; habanero pepper; organic insecticide; repellency.