Development duration, longevity and fertility of Eretmocerus mundus Mercet and Encarsia sophia (Girault & Dodd) (Hymenoptera: Aphelinidae) on Bemisia tabaci (Hemiptera: Aleyrodidae) attacking cassava in Uganda

Michael Otim; Samuel Kyamanywa; Peter Asiimwe; James Legg; Moshe Guershon; Dan Gerling

Authors

Michael Otim National Crops Resources Research Institute, Namulonge, P. O. Box Namulonge 7084, Kampala, Uganda. E-mail: motim9405@gmail.com
Samuel Kyamanywa College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda. E-mail: skyamanywa@gmail.com
Peter Asiimwe Monsanto Company, 800 N. Lindbergh Boulevard, St. Louis, MO 63141, USA. E-mail: asiimwe.peter@gmail.com
James Legg International Institute of Tropical Agriculture – Tanzania, P. O. Box 34441, Dar es Salaam, Tanzania. E-mail: j.legg@cgiar.org https://orcid.org/0000-0003-4140-3757
Moshe Guershon The Steinhardt Natural History Museum and Research Center & Department of Zoology, Tel Aviv University, Ramat Aviv, 69978 Israel. E-mail: mois@tauex.tau.ac.il
Dan Gerling Department of Zoology, Tel Aviv University, Ramat Aviv, 69978 Israel

Keywords:

Hymenoptera, Aphelinidae, Encarsia sophia, Eretmocerus mundus, parasitoids, Hemiptera, Aleyrodidae, Bemisia tabaci, whiteflies, demographic fitness, development, generation time, reproduction, reproduction rate, cassava, Africa, Afrotropical, East Africa, Uganda

Abstract

At least one member of the whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) species complex is a vector of cassava mosaic geminiviruses and cassava brown streak viruses, which cause serious damage to cassava, Manihot esculenta Crantz. The whiteflies are predominantly attacked by Eretmocerus mundus Mercet and Encarsia sophia (Girault & Dodd) (Hymenoptera: Aphelinidae). These parasitoids had, however, not been able to control B. tabaci populations on cassava. This study therefore aimed at elucidating how life history parameters limit the performance of the parasitoids. We conducted the study under fluctuating laboratory conditions to determine the development duration, longevity and fertility of these parasitoids. The initial egg count on emergence and development duration were higher in E. mundus than in E. sophia. Similarities occurred in the development duration of females and males E. mundus, whereas the females of E. sophia developed about two days earlier than their males. Mean longevity of females when provided with honey diet was 5.4 days for E. mundus and 6.6 days for E. sophia, and averaged 5.5 days and 11.3 days, respectively, when developed on whitefly nymphs. Progeny production averaged 25.6 offspring for E. mundus and 16.5 for E. sophia. The net reproductive rate of E. mundus was 13.1 as opposed to 15.5 for E. sophia. The intrinsic rate of increase was 0.10 for E. mundus and 0.11 for E. sophia. Mean generation time was 24.9 and 26.2 days for E. mundus and E. sophia, respectively. The results suggest that E. mundus is the most suitable candidate for high B. tabaci population control, whereas E. sophia may be effective under low B. tabaci populations.

Cite as: Otim, M., Kyamanywa, S., Asiimwe, P., Legg, J., Guershon, M. & Gerling, D. 2018. Development duration, longevity and fertility of Eretmocerus mundus Mercet and Encarsia sophia (Girault & Dodd) (Hymenoptera: Aphelinidae) on Bemisia tabaci (Hemiptera: Aleyrodidae) attacking in Uganda. Israel Journal of Entomology 48 (2): 141–155. <published 12 August 2018>

DOI: 10.5281/zenodo.1344116

urn:lsid:zoobank.org:pub:4AA850C3-0074-4C83-9F11-4D6CBA0EAE7