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Advances in Research, ISSN: 2348-0394,Vol.: 2, Issue.: 4 (April)

Original-research-article

Parasitization of Helicoverpa armigera (Lepidoptera: Noctuidae) by four Indigenous Trichogrammatid Species/Strains in a Mixed Cropping System of Tomato and Okra

 

Andrew Kalyebi1*, S. Hassan2, S. Sithanantham3 and J. M. Mueke4

1National Crops Resources Research Institute, Kampala, Uganda..
2BBA, Federal Institute of Biological control, Darmstadt, Germany.
3International Centre of Insect Physiology and Ecology, Nairobi, Kenya.
4Department of Zoology, Kenyatta University, Nairobi, Kenya.

Article Information

Editor(s):

(1) Maria Selvaggi, Department DETO - Section of Veterinary Science and Animal Production University of Bari "Aldo Moro", Italy.

Reviewers:

(1) Anonymous.

(2) Pablo Daniel Ghiringhelli, Universidad Nacional de Quilmes, Argentina.

Complete Peer review History:http://www.sciencedomain.org/review-history/3836

Abstracts

Aims: Egg parasitoids, Trichogramma are recognised as natural enemies of many lepidoptera pests worldwide. In Kenya, a number of indigenous parasitoids species have been recovered. We evaluated the relative preference (parasitism) by four Trichogrammatid egg parasitoid species/strains, namely, T. sp. nr. mwanzai (L), T. sp. nr. lutea (H), T. sp. nr. mwanzai (M) and T. sp. nr. lutea (M) for the African bollworm Helicoverpa armigera on two of its host plants, tomato and okra usually intercropped in smallholder farms in Kenya.
Study Design: Host parasitism on host plants.
Methodology: Evaluations of parasitism for H. armigera by Trichogrammatid species/strains on Tomato and Okra in bioassays in both laboratory and field cages, in choice and no-choice conditions were undertaken.
Results: In general, species/strains exhibited significant differences in parasitism for the host (F=2.8; df =3, 7; P= 0.05) but neither the host plant nor host plant x species/strain interaction affected parasitism. Chi-square analyses showed no significant preference by species/strains between the two host plants although there was greater tendency by the parasitoids to go for H. armigera on okra than tomato.
Conclusion: The results give useful insights in planning for augmentation biological control of H. armigera in mixed farming agroecosystems. The four Trichogrammatids could effectively be used in augmentation programs in the tomato-okra cropping systems.

Keywords :

Trichogramma; host plant; preference; biological control; mixed cropping.

Full Article - PDF    Page 188-194

DOI : 10.9734/AIR/2014/8377

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