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Phytoparasitica

, Volume 38, Issue 2, pp 111–119 | Cite as

Effect of seasons and larval food plants on the quality of Gonometa postica cocoons

  • Ken O. Fening
  • Esther N. Kioko
  • Suresh K. Raina
  • Jones M. Mueke
Article

Abstract

The effect of food plants [Acacia elatior Brenan, A. tortilis (Forssk.) and A. nilotica (L.) Del.] on the development time of Gonometa postica Walker (Lepidoptera: Lasiocampidae) larvae and the quality of their cocoons was studied in the Imba and Mumoni forests of Mwingi, Eastern Kenya, during the long (March-May) and short (October-December) rainy seasons of 2006 and 2007. Larvae were reared in semi-captivity in net sleeves attached to branches of the plants. The period between hatching of eggs and spinning of cocoons, as well as their weight, as determinants of cocoon quality were recorded. In addition, collections of cocoons from the wild were done in the two forests from the same host plants for assessment of their quality. In the cage experiment, larval development period and quality of cocoons differed according to food plants, seasons and sites, whereas quality of cocoons sampled from the wild habitat was similar for all food plants and seasons but varied according to site. Generally, there was a positive correlation between weight of cocoon, its length and width for the two seasons for both the semi-captive population and those from the wild. Larvae reared on A. elatior had a shorter development period and higher cocoon quality than those raised on A. tortilis and A. nilotica. Generally, temperature and relative humidity significantly influenced larval development time and the effect was both positive and negative. Rainfall was generally higher in Mumoni than in Imba. The implications of the above findings for the semi-captive rearing of G. postica to increase the quality of cocoons are discussed.

Keywords

Acacia species Cocoon quality Larval development period Semi-captive rearing 

Notes

Acknowledgments

The authors are grateful to the International Fund for Agricultural Development (IFAD), United Nations Development Programme-Global Environmental Fund (UNDP-GEF) and DAAD (German Academic Exchange Service) for providing financial support and to the International Centre of Insect Physiology and Ecology (ICIPE) for providing technical support for this work. We thank Daniel Muia and Florence Kiilu of ICIPE for their assistance in data collection. We express our sincere gratitude to silk farmers in Imba and Mumoni forests of Mwingi, eastern Kenya, for supporting this project. We appreciate the critical views and comments expressed by Dr. Fritz Schulthess on the draft manuscript.

References

  1. Ayres, M. P., & Scriber, J. M. (1994). Local adaptations to regional climates in Papilio canadensis (Lepidoptera: Papilionidae). Ecological Monographs, 64, 465–482.CrossRefGoogle Scholar
  2. Bayhan, E., Olmez-Bayhan, S. O., Ulusoy, M. R., & Brown, J. K. (2005). Effect of temperature on the biology of Aphis punicae (Passerini) (Homoptera: Aphididae) on pomegranate. Environmental Entomology, 34, 22–26.CrossRefGoogle Scholar
  3. Delport, W., Ferguson, J. W., & Bloomer, P. (2005). Characterization of the six microsatellite loci in the African wild silkmoth (Gonometa postica, Lasiocampidae). Molecular Ecology Notes, 5, 860–862.CrossRefGoogle Scholar
  4. Duale, A. H. (2005). Effect of temperature and relative humidity on the biology of the stem borer parasitoid Pediobius furvus (Gahan) (Hymenoptera: Eulophidae) for the management of stem borers. Environmental Entomology, 34, 1–5.CrossRefGoogle Scholar
  5. Fening, O. K., Kioko, E. N., Raina, S. K., & Mueke, J. M. (2008). Monitoring wild silkmoth, Gonometa postica Walker, abundance, host plant diversity and distribution in Imba and Mumoni woodlands in Mwingi, Kenya. International Journal of Biodiversity Science and Management, 4, 104–111.CrossRefGoogle Scholar
  6. Fening, O. K., Kioko, E. N., & Raina, S. K. (2009). Effect of parasitoids’ exit and predators’ ingress holes on silk yield of the African wild silkmoth, Gonometa postica Walker (Lepidoptera: Lasiocampidae). International Journal of Industrial Entomology, 19, 265–268.Google Scholar
  7. Hartland-Rowe, R. (1992). The biology of the wild silkmoth Gonometa rufobrunnea Aurivillius (Lasiocampidae) in northeastern Botswana, with some comments on its potential as a source of wild silk. Botswana Notes and Records, 24, 123–133.Google Scholar
  8. Howe, R. W. (2008). The effect of temperature and relative humidity on the rate of development and the mortality of Tribolium madens (Charp.) (Coleoptera, Tenebrionidae). Annals of Applied Biology, 50, 649–660.CrossRefGoogle Scholar
  9. Kioko, E. N., Raina, S. K., & Mueke, J. M. (2000). Survey on the diversity of wild silkmoth species in East Africa. East African Journal of Science, 2, 1–6.Google Scholar
  10. Kioko, E. N., Raina, S. K., Fening, K. O, Ngoka, B., Wainaina, P., & Adolkar, V. V. (2007). Evaluation of cocoon characteristics of Gonometa postica (Lepidoptera: Lasiocampidae) from farmers’ sites in Mwingi District, Kenya. Resumes/Abstracts of the 17th Conference of the African Association of Insect Scientists (p. 61, Dakar, Senegal).Google Scholar
  11. Ngoka, M. B., Kioko, E. N., Raina, S. K., Mueke, J. M., & Kimbu, D. M. (2008). Semi-captive rearing of the African wild silkmoth Gonometa postica (Lepidoptera: Lasiocampidae) on an indigenous and a non-indigenous host plant in Kenya. International Journal of Tropical Insect Science, 27, 183–190.CrossRefGoogle Scholar
  12. Raina, S. K. (Compiler) (2004) Commercial insects: A practical guide for raising and utilising silkmoths and honey bees in Africa. Vols. 1–3. Overholt, K. (Ed.), Nairobi, Kenya: ICIPE Science Press.Google Scholar
  13. SAS Institute Inc. (2003). SAS/STAT Users’ Guide, version 8 (6th ed., Vol. 2). Cary, NC, USA: SAS Institute Inc.Google Scholar
  14. Taylor, F. (1981). Ecology and evolution of physiological time in insects. American Naturalist, 117, 1–23.CrossRefGoogle Scholar
  15. Veldtman, R., McGeoch, M. A., & Scholtz, C. H. (2002). Variability in pupal size in Southern Africa wild silkmoths: implications for sustainable harvesting. African Entomology, 10, 127–136.Google Scholar
  16. Veldtman, R., McGeoch, M. A., & Scholtz, C. H. (2007). Fine-scale abundance and distribution of wild silkmoth pupae. Bulletin of Entomological Research, 97, 15–27.CrossRefPubMedGoogle Scholar

Copyright information

© Springer Science & Business Media BV 2010

Authors and Affiliations

  • Ken O. Fening
    • 1
  • Esther N. Kioko
    • 2
  • Suresh K. Raina
    • 3
  • Jones M. Mueke
    • 4
  1. 1.CSIR-Crops Research InstituteKumasiGhana
  2. 2.National Museums of KenyaNairobiKenya
  3. 3.Commercial Insects Programmeicipe-African Insect Science for Food and HealthNairobiKenya
  4. 4.Department of Zoological SciencesKenyatta UniversityNairobiKenya

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