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 Syringa (Melia Azedarach L.) extracts on eggs, nymphs and adult red spider mites, Tetranychus spp. (Acari: Tetranychidae) on tomatoes

Mwandila N. J. K
  • Mwandila N. J. K
  • 1Department of Environmental Sciences, University of South Africa (UNISA), Florida 1710, South Africa.
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J. Olivier
  • J. Olivier
  • 1Department of Environmental Sciences, University of South Africa (UNISA), Florida 1710, South Africa.
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D. Munthali2
  • D. Munthali2
  • 2Department of Crop Science and Production, Botswana College of Agriculture, Private Bag 0027, Gaborone, Botswana.
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D. Visser
  • D. Visser
  • -Roodeplaat Vegetable and Ornamental Plant Institute (VOPI), Private Bag X293, Pretoria 0001, South Africa.
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  •  Accepted: 18 February 2013
  •  Published: 31 March 2013

Abstract

 

This study evaluated the effect of Syringa (Melia azedarach) fruit and seed extracts (SSE) on red spider mite (Tetranychus spp.) eggs, nymphs and adults. Bioassay investigations were carried at the Vegetable and Ornamental Plant Institute (VOPI) outside Pretoria in South Africa using different concentrations (0.1, 1, 10, 20, 50, 75 and 100%) of SSE. Mortalities were measured at 24, 48 and 72 h after treatment and compared to the effects of the synthetic acaricides: Abamectin, chlorfenapyr and protenofos. A completely randomized design (CRD) was used with 12 treatments. Analysis of variance (ANOVA) was used to test for effects of treatments. Differences in treatment means were identified using Fisher’s protected t-test least significant difference (LSD) at the 1% level of significance. Data were analysed using the statistical program GenStat (2003). The result of the analyses revealed that the efficacy of SSE and commercial synthetic acaricides increased with exposure time.Concentration of 50% and above SSE was as effective against red spider mite (RSM) adults, eggs and nymphs as the synthetic acaricides.

                                                                                                                    

Key words: Syringa fruit and seed extracts, Melia azedarach, red spider mites, acaricidal activity, tomatoes.