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Provedor de dados:  PAB
País:  Brazil
Título:  Effect of neem extract on the cotton aphid
Autores:  Santos,Terezinha Monteiro dos
Costa,Nivânia Pereira
Torres,Adalci Leite
Boiça Júnior,Arlindo Leal
Data:  2004-11-01
Ano:  2004
Palavras-chave:  Insecta
Aphis gossypii
Azadirachta indica
Gossypium hirsutum
Aqueous extract
Resumo:  The aphid Aphis gossypii Glover (Hemiptera: Aphididae), a harmful pest on cotton, causes direct damage, reducing plant vigor, and indirect damage by honeydew secretion and transmission of several viruses. Due to the problem of pesticide resistance, alternative techniques for chemical control, such as the use of natural insecticides, have been object of research. The effects of aqueous extracts of neem (Azadirachta indica A. Juss) seed powder on the development, survival and fecundity of A. gossypii were evaluated. Treatments consisted of neem seed powder in the concentrations of 23.8, 122.0, 410.0 and 1,410.0 mg/100 mL of distilled water. Mortality rate during the nymphal development for aphids maintained on cotton leaf discs treated with the two highest concentrations were, respectively, 60.0% and 100.0%. With the exception of the highest concentration (1,410.0 mg/100 mL), neem concentrations did not extend the aphids' development period. The net reproductive rate (R0) was of 35.0 nymphs/female for control aphids and of 0.0 nymph/female when the group of females was exposed to neem seed powder at 1,410.0 mg/100 mL since birth. The aqueous extract of neem seeds is efficient against the aphid A. gossypii, causing nymph mortality and reducing their survival period and fecundity.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira
Relação:  10.1590/S0100-204X2004001100003
Formato:  text/html
Fonte:  Pesquisa Agropecuária Brasileira v.39 n.11 2004
Direitos:  info:eu-repo/semantics/openAccess

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