Advertisement

Comparative Evaluation of the Efficacy of Aqueous Neem Extract and Dipel 2x on Diamondback Moth, Plutella xylostella Linn., on Cabbage in Kenya

  • S. OkothEmail author
  • C. K. P. Ogol
  • M. Basimike
  • M. Varela
Research Article

Abstract

The efficacy of neem kernel cake powder water extract (NKCP-WE) and Dipel 2x (Bacillus thuringiensis var. kurstakt) in controlling the diamondback moth (DBM), Plutella xylostella Linn. (Lepidoptera: Yponomeutidae), on cabbage was evaluated in screenhouse experiments. All concentrations of NKCP-WE tested were larvicidal and plants treated with 25 and 50 g/l NKCP-WE retained larvicidal activity for up to 2 weeks after application. The efficacy of 25 and 50 g/l NKCP-WE and 0.5 g/l Dipel 2x was compared by observing DBM development on the treated plants and yields of those plants. Dipel 2x-treated plants had less DBM larval infestation than the neem-treated plants but the latter treatment gave better yield. The implications of these observations are discussed.

Key Words

neem Azadirachta indica Dipel 2x Bacillus thuringiensis diamondback moth Plutella xylostella cabbage Kenya 

Résumé

On a comparé l’efficacité de l’extrait aqueux de neem kernel (NKCP-WE) au Dipel 2x (Bacillus thuringiensis var. kurstaki), pour lutter contre le papillon de nuit à dos diamant (DBM) Plutella xylostella Linn. (Lepidoptera: Yponomeutidae). Toutes les concentrations de NKCP-WE testées ont exprimé une action larvicide et les plantes traitées avec 25 et 50 g/l de NKCP-WE ont gardé une activité larvicide pendant les deux semaines suivantes. L’efficacité des traitements à 25 g/l et 50 g/l de NKCP-WE et 0.5 g/l Dipel 2x a été comparé en observant le développement du DBM sur les plants traités et les rendements de ces plants. Les plants traités au ‘Dipel 2x’ ont hébergé moins de larves que les plants traites au ‘neem’ mais ce dernier a donné un meilleur rendement. Les implications de ces observations sont discutées.

Mots Clés

neem Azadirachta indica Dipel 2x Bacillus thuringiensis le papillon de nuit a diamant Plutella xylostella le chou Kenya 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Abraham, E. V. and Padmanabhan M. D. (1968) Bionomics and control of diamondback moth, Plutetta xylostella Courts. Indian, J. Agric. Sci. 38, 513–519.Google Scholar
  2. Hederson, M. (1957) Insecticidal control of diamondback moth Plutetta maculipennis on cabbage at Cameroon highlands, Malasyia. Agric. J. 40, 275–279.Google Scholar
  3. Ho, T. N. and Ng, K. Y (1970) Bacillus thuringiensis Beliner for the control of diamondback moth in Western Malasyia. Agric. J. 47, 313–322.Google Scholar
  4. Fagoonee, I. (1987) Use of neem on vegetable crop protection in Mauritius, pp. 177–184. In Natural Pesticides from the Neem Tree and Other Tropical Plants. Proc. 3rd Int. Neem Conf., 1986, Nairobi (Edited by, H. Schumutterer and, K. R. S. Ascher). VCH Publishers Inc., New York.Google Scholar
  5. Isman, M. B., Koul, O., Lowery, D. T., Anarson, J. T., Gagnon, D., Stewart, J. G. and Saloum, G. S. (1990) Development of neem based insecticides in Canada, pp. 32–39. In Proc. USD A Neem Workshop, Beltsville MD.Google Scholar
  6. Koul, O. and Isman, M. B. (1991) Effect of azadirachtin on dietary utilisation and development of variegated cutworm Peridroma saucia.). Insect Physiol. 37, 591–598.CrossRefGoogle Scholar
  7. Ritener, K., Bohn, G. K. and Kleeberg, H. (1997) Effect of neem Azal, a natural azadirachtin-containing preparation, on Periplaneta americana (L) (Orthoptera: Blattidae). J. Insect Physiol 38, 324–330.Google Scholar
  8. Schumutterer, H. (1995) (ed.) The Neem Tree. Source of Unique Natural Products for Integrated Pest Management, Medicine, Industry and Other Purposes. VCH Publishers Inc., New York, NY.Google Scholar
  9. Seif, A. A. (1995) A report on results of plant protection research on brassicas in Kenya for the period 1980–1995. National Agricultural Research Laboratories, Kenya Agric. Res. Inst. Nairobi, Kenya.Google Scholar
  10. Snedecor, W. G. and Cochran, W. G. (1987) Statistical Methods. The Iowa State University Press, Ames, Iowa, USA.Google Scholar
  11. laleker, N. S. and Griggs, T. D. (Eds) (1986) Diamondback moth management, pp. 248–339. In Proceedings of the First International Workshop. AVRDC Publication No. 86.Google Scholar
  12. Verma, A. N. and Sandhu, G. S. (1967) Relative efficacy of different pesticides as contact poison to the larvae of diamondback moth. J. Res. Punjab Agric. Univ. 4, 556–559.Google Scholar
  13. Vollinger, K. (1987) The possible development of resistance against neem seed kernel extract and deltamethrin in Plutetta xylostella, pp. 543–555. In Natural Pesticides from the Neem Tree and Other Tropical Plants. Proc 3rd Int. Neem Conf., 1986, Nairobi (Edited by, H. Schumutterer and, K. R. S. Ascher). VCH Publishers Inc., New York, NYGoogle Scholar

Copyright information

© ICIPE 2002

Authors and Affiliations

  • S. Okoth
    • 1
    Email author
  • C. K. P. Ogol
    • 2
  • M. Basimike
    • 2
  • M. Varela
    • 3
  1. 1.Kenya Trypanosomiasis Research InstituteKikuyuKenya
  2. 2.Department of ZoologyKenyatta UniversityNairobiKenya
  3. 3.GTZ IPM Horticulture ICIPENairobiKenya

Personalised recommendations