IngentaConnect Suitability of Bemisia tabaci (Hemiptera: Aleyrodidae) instars fo...

Authors: Qiu, Bao-Li¹; De Barro, Paul²; He, Yu-Rong¹; Ren, Shun-Xiang¹

Source: Biocontrol Science and Technology, Volume 17, Number 8, 2007 , pp. 823-839(17)

Abstract:

The host instar preferences of Encarsia bimaculata and Eretmocerus sp. nr. furuhashii parasitizing Bemisia tabaci and their development on four host plants, collard, eggplant, cucumber and tomato, were studied in the laboratory. Both of the parasitoids accepted all nymphal stages of B. tabaci, but E. bimaculata preferred third and fourth instars while Er. sp. nr. furuhashii preferred second and third instars under both choice and no choice conditions. Regardless of host stage parasitized, adults of parasitoids emerged only from fourth instars. When given the simultaneous choice of all instars, E. bimaculata reduced parasitization of first and second instars (3.73 and 4.76%, respectively) while increasing parasitization of third and fourth instars (5.44 and 6.93%, respectively), in contrast Er. sp. nr. furuhashii increased its parasitization of second and third instar nymphs (1.27 and 3.17%, respectively) and decreased that of first and fourth instars (7.0 and 3.06%, respectively). Host plants did not significantly influence instar preference for either parasitoid. Developmental periods of both the parasitoids from egg to adult emergence were longest when first instars were parasitized and shortest when fourth instars were selected. Parasitoid developmental time was generally shorter on glabrous plants than on hirsute plants.

Keywords: Encarsia bimaculata; Eretmocerus sp. nr. furuhashii; Bemisia tabaci; whitefly; oviposition preference; development; host plant; biological control

Document Type: Research article

DOI: 10.1080/09583150701595042

Affiliations: 1: Department of Entomology, South China Agricultural University, Guangzhou, People's Republic of China 2: CSIRO Entomology, Indooroopilly, Queensland, Australia

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Suitability of Bemisia tabaci (Hemiptera: Aleyrodidae) instars for the parasitization by Encarsia bimaculata and Eretmocerus sp. nr. furuhashii (Hymenoptera: Aphelinidae) on glabrous and hirsute host plants