2002
DOI: 10.1079/ber2002203
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Interspecific host discrimination and within-host competition between Encarsia formosa and E. pergandiella (Hymenoptera: Aphelinidae), two endoparasitoids of whiteflies (Hemiptera: Aleyrodidae)

Abstract: Interspecific host discrimination and within-host competition between Encarsia formosa Gahan and Encarsia pergandiella (Howard), two endoparasitoids of whiteflies, were studied under laboratory conditions. Interspecific host discrimination was studied at two time intervals (0 h and 72 h after the first species had oviposited). Parasitized and unparasitized Trialeurodes vaporariorum (Westwood) hosts were accepted for oviposition at the same rate by the two parasitoid species. Host type did not affect the handli… Show more

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Cited by 29 publications
(20 citation statements)
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“…On one hand, female E. tricolor may be able to discriminate between heterospecific and conspecific pupae as put forward by Avilla et al (1991), on the other hand other autoparasitoid species such as E. pergandiella may not (Pedata et al 2002). Our observations showed that E. tricolor could easily discriminate different host species in the prepupal stage through antennal examination, but females had to insert their ovipositor to discriminate between immature stages of the hosts (Tables 1, 2).…”
Section: Effect Of Host Species On Hyperparasitismmentioning
confidence: 79%
“…On one hand, female E. tricolor may be able to discriminate between heterospecific and conspecific pupae as put forward by Avilla et al (1991), on the other hand other autoparasitoid species such as E. pergandiella may not (Pedata et al 2002). Our observations showed that E. tricolor could easily discriminate different host species in the prepupal stage through antennal examination, but females had to insert their ovipositor to discriminate between immature stages of the hosts (Tables 1, 2).…”
Section: Effect Of Host Species On Hyperparasitismmentioning
confidence: 79%
“…In competition, one parasitoid species could directly affect the other species through multiparasitism or intraspecific interference, as well as interspecifically by host feeding on the parasitized hosts (Collier & Hunter, 2001). Heterospecific ovicidal effects also may occur (Netting & Hunter, 2000; Pedata et al ., 2002; Collier et al ., 2007). Different parasitoids may therefore result in different outcomes.…”
Section: Discussionmentioning
confidence: 99%
“…Adult females of E . formosa and Encarsia pergandiella , both having heterospecific ovicides to each other, kill eggs of competitors to prevent larval competition, and then feed on or oviposit into the host (Pedata et al ., 2002).…”
Section: Introductionmentioning
confidence: 99%
“…, 2005) could also be partly responsible (we observed clumping of hosts used for oviposition; S.G. Kenyon, unpublished). Previous studies have shown a tendency for superparasitism in other E. pergandiella populations (Hunter, 1989; Pedata et al. , 2002) and that previous oviposition experience may be necessary to make decisions about the state of the host (Hunter, 1989; Ardeh et al.…”
Section: Discussionmentioning
confidence: 99%