Insecticide and Activity of Vegetal Extracts on the Silverleaf Whitefly (Bemisia tabaci)

  • Sandra Conceição Paixão de Jesus Universidade do Estado da Bahia - UNEB
  • Fernando Antônio Cavalcante de Mendonça Universidade do Estado da Bahia - UNEB
  • José Osmã Teles Moreira Universidade do Estado da Bahia - UNEB
Keywords: Bemisia tabaci, Vegetal Extracts, Insecticide Plants

Abstract

Insecticide potential and efficaciousness of vegetal extracts concentrations from six botanic families in three different modes were analyzed on the nymphs of the silverleaf whitefly Bemisia tabaci (Genn. 1889) on a tomato plantation Lycopersicon esculentum Mill. Nymph breeding was kept in cherry tomato shrubs. Test solutions were obtained from successive extractions with ethanol and evaporation in a rotary evaporator. Tests consisted of 10 solutions in four concentrations (500; 1,000; 1,500 and 3,000 μg/mL) and control treatment (distilled water + 1% DMSO) under three different modes of activity, namely, contact, translaminar and systemic. Experimental design was totally randomized with four repetitions and eleven treatments. Means were compared by Scott-Knott test at 5% probability and lethal concentrations (CL50) were calculated by POLO. In the case of contact activity mode, all extracts had efficiency above 50% with the highest concentration (3,000 μg/mL) in which the highest efficiency for all extracts tested was verified. There was a need for dose increase in translaminar activity mode for similar results, whereas in the case of systemic activity the best performance was obtained with extracts of Nerium oleander, Derris amazonica and Ipomoea carnea. Extracts of the last two caused a higher percentage when compared with that of other extracts in all activity modes lower than CL50.

Author Biographies

Sandra Conceição Paixão de Jesus, Universidade do Estado da Bahia - UNEB
Graduação em Agronomia pela Universidade do Estado da Bahia - UNEB, Mestre em Agronomia pelo Programa de Pós Graduação em Horticultura Irrigada do Departamento de Tecnologia e Ciências Sociais da Universidade do Estado da Bahia – UNEB. E-mail: sandraento06@yahoo.com.br
Fernando Antônio Cavalcante de Mendonça, Universidade do Estado da Bahia - UNEB
Graduado em Engenharia Agronômica pela Universidade Federal de Alagoas – UFAL; Mestre em Entomologia pela Universidade Federal de Viçosa – UFV; Doutor em Ciências Biológicas (Entomologia) pela Universidade Federal do Paraná – UFPR; Docente adjunto da Universidade do Estado da Bahia – UNEB.
José Osmã Teles Moreira, Universidade do Estado da Bahia - UNEB
Graduação em Engenharia Agronômica pela Universidade do Estado da Bahia – UNEB; Mestre em Agronomia (Produção Vegetal) pela Universidade Estadual Paulista Júlio de Mesquita Filho – UNESP; Doutor em Ciências Biológicas (Entomologia) pela Universidade Federal do Paraná - UFPR.
Published
2012-08-08
Section
Environment