African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Efficacy of selected plant extracts in the okra pest, Zonabris pustulata (Thunberg)

Jeyaparvathi S.* and Umayal Parvathi M.
Department of Zoology, Ayya Nadar Janaki Ammal College, Sivakasi – 626 124, Tamil Nadu, India.
Email: [email protected]

  •  Accepted: 22 July 2013
  •  Published: 01 August 2013

Abstract

The mortality of Zonabris pustulata with varied concentration of plant extracts was analyzed. For instance, high pesticidal activity was recorded from the crude extracts of Azadirachta indicaOcimum sanctum, Cynodon dactylon, Calotropis gigantea and Acalphya indica. The mortality of Z. pustulata which occurred in the Aindicaextract increased with increased concentration of plant extracts at 48 and 72 h. During 24 h, at 2.0% concentration, there was no mortality and highest mortality was occurring during 10.0% concentration. In 4.0 and 6.0% concentrations, there were no changes in the mortality of beetle. In 72 h, highest mortality was occurring at 2.0, 10.0 and crude extracts. There was no mortality occur in the control. The highest mortality occurred during 48 h (1.71 ± 1.28), and the lowest mortality occur during 72 h (1.29 ± 0.7). The highest mortality of Z. pustulata occurs at 2.0 and 4.0% from 24 to 72 h in the C. gigantea extract treatment. The highest mortality occurred at 24 h (2 ± 1.31) followed by 48 h (1.86 ± 1.55) and the lowest mortality occurs at 72 h (1.28 ± 0.88). At 24 and 48 h, there was no mortality at 2.0, 4.0, 6.0, 8.0 and 10.0%. At 24 h the mortality occurs at 4.0 and 10.0%. The highest mortality occurs at crude extract treatment. At 48 h, the death rate increased at 8.0% concentration. The highest mortality occurs at 72 h (2±1.31) followed by 48 h (1.14 ± 1.25) and the lowest mortality occurs at 24 h (0.57 ± 0.73).

 

Key words: Botanicals, pesticide, insecticides, pests, plant extracts.