Toxicity and application of neem in fall armyworm

Authors

  • Marcílio Souza Silva Universidade Federal de Alagoas
  • Sônia Maria Forti Broglio Universidade Federal de Alagoas, UFAL
  • Roseane Cristina Prédes Trindade Universidade Federal de Alagoas, UFAL
  • Emerson Santos Ferrreira Universidade Federal de Alagoas
  • Ismael Barros Gomes Universidade Federal de Alagoas
  • Lígia Broglio Micheletti Universidade Federal de Alagoas, UFAL

DOI:

https://doi.org/10.14295/cs.v6i3.808

Keywords:

caterpillar, control, residue, Zea mays

Abstract

Aqueous extracts of neem, Azadirachta indica A. Juss., leaf and seed cake were tested for toxicity in Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) utilizing different methods of application (foliar and systemic). Probit analysis was used to determine the LC50 and regression analysis for mortality at different concentrations of the extracts (0.5%, 1.0%, 1.5%, 2.0% and control treatment). Two caterpillar morphometric variables (larval length and cephalic capsule width) and the scale of damage of attacked plants were measured and, analyzed using the Kruskal-Wallis test (P<0.05). The LC50 values for neem seed cake and leaves were 0.13% and 0.25%, respectively. For larval length and cephalic capsule width, the larvae were more affected to the seed cake extract than leaf extract, however there was no significant difference between the methods of application for these variables. There was no difference in the scale of damage by the extracts and the methods of application analyzed. Both methods of application provided similar results and, the main differences were associated with more efficient of the seed cake extract.

 

 

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Author Biographies

Marcílio Souza Silva, Universidade Federal de Alagoas

Universidade Federal de Alagoas, Centro de Ciências Agrárias, BR 104 N, Km 85, s/n,  Rio Largo, AL, Brazil, CEP 57100-000

Sônia Maria Forti Broglio, Universidade Federal de Alagoas, UFAL

Centro de Ciências Agrárias, CECA

Laboratório de Entomologia

Rod. BR 104, Km 85N, Rio Largo, AL

CEP: 57.100-000

soniamfbroglio@gmail.com

Roseane Cristina Prédes Trindade, Universidade Federal de Alagoas, UFAL

Universidade Federal de Alagoas, Centro de Ciências Agrárias, BR 104 N, Km 85, s/n,  Rio Largo, AL, Brazil, CEP 57100-000

Emerson Santos Ferrreira, Universidade Federal de Alagoas

Universidade Federal de Alagoas, Centro de Ciências Agrárias, BR 104 N, Km 85, s/n,  Rio Largo, AL, Brazil, CEP 57100-000

Ismael Barros Gomes, Universidade Federal de Alagoas

Universidade Federal de Alagoas, Centro de Ciências Agrárias, BR 104 N, Km 85, s/n,  Rio Largo, AL, Brazil, CEP 57100-000

Lígia Broglio Micheletti, Universidade Federal de Alagoas, UFAL

Universidade Federal de Alagoas, Centro de Ciências Agrárias, BR 104 N, Km 85, s/n,  Rio Largo, AL, Brazil, CEP 57100-000

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Published

2015-12-29

How to Cite

Silva, M. S., Broglio, S. M. F., Prédes Trindade, R. C., Ferrreira, E. S., Gomes, I. B., & Micheletti, L. B. (2015). Toxicity and application of neem in fall armyworm. Comunicata Scientiae, 6(3), 359–364. https://doi.org/10.14295/cs.v6i3.808

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Original Article