Effect of neem extract on the cotton aphid

Pesquisa Agropecuária Brasileira

Terezinha Monteiro Dos Santos²  Nivânia Pereira Costa¹  Adalci Leite Torres¹  Arlindo Leal Boiça Júnior¹ 

[1] ,Universidade Federal de Lavras Departamento de Entomologia Lavras MG

关键词: Insecta;    Aphis gossypii;    Azadirachta indica;    Gossypium hirsutum;    aqueous extract;    Insecta;    Aphis gossypii;    Azadirachta indica;    Gossypium hirsutum;    extrato aquoso;   

DOI  :  10.1590/S0100-204X2004001100003

来源: SciELO

【 摘 要 】

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.

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