Abstract:1 Predictions from the Phylogenetic Constraints Hypothesis were tested for the first time in an eruptive forest Lepidopteran species, the western spruce budworm. 2 In previous work, we established that western spruce budworm females exhibit oviposition preferences with regard to tree age, tree vigour and host species. However, there was no evidence to support a link between oviposition preference and larval performance, which supports the Phylogenetic Constraints Hypothesis. 3 Our preference data led us to tes… Show more
“…Outre ce phénomène, Leyva et al (2000) ont montré que la tordeuse occidentale de l'épinette {Choristoneura occidentalis) (Freeman) avait une préférence pour les pousses plus longues lors de la ponte. Les TBE vont par ailleurs éviter de pondre non seulement sur des branches déjà défoliées, mais aussi à proximité d'oeufs pondus par leurs semblables (Leyva et al, 2003). Par conséquent, ce lépidoptère pondrait ses oeufs au niveau des étages un peu plus supérieurs n'ayant pas été encore perturbés.…”
Section: Réduction De Croissance Au Niveau Des Branchesunclassified
“…Outre ce phénomène, Leyva et al (2000) ont montré que la tordeuse occidentale de l'épinette {Choristoneura occidentalis) (Freeman) avait une préférence pour les pousses plus longues lors de la ponte. Les TBE vont par ailleurs éviter de pondre non seulement sur des branches déjà défoliées, mais aussi à proximité d'oeufs pondus par leurs semblables (Leyva et al, 2003). Par conséquent, ce lépidoptère pondrait ses oeufs au niveau des étages un peu plus supérieurs n'ayant pas été encore perturbés.…”
Section: Réduction De Croissance Au Niveau Des Branchesunclassified
“…The female pupae came from the same laboratory colony and were comparable in size (unpublished data), making it reasonable to assume that they also had about the same number of oocyctes when they emerged as moths and thus would be likely to lay similar numbers of egg masses. The number of egg masses is a reasonable index of the number of eggs laid (Leyva et al 2003), indicating that females who lay more egg masses retain fewer eggs. Needles bearing egg masses were also measured to evaluate potential differences in the lengths of the resistant and susceptible Douglas-Þr needles selected for oviposition.…”
“…In similar no-choice experiments, Levya et al (2003) reported that budworm moths retained a higher percentage of eggs when they had branches from only one host (Douglas-Þr, white Þr, Engelmann spruce) or nonhost (limber pine [Pinus flexilis James]) to oviposit on, compared with when they had branches from all four tree species for oviposition substrate. Leyva et al (2003) concluded that budworm moths were induced to lay more of their eggs when they had a variety of host species available for oviposition. Host plant cues are obviously important factors inßuencing budworm oviposition behavior.…”
“…The ability of both C. occidentalis and C. fumiferana (Clemens) to feed and oviposit selectively has been demonstrated in numerous studies (Guertin and Albert 1992;Langevin 1994, 1995;Dodds et al 1996;Leyva et al 2000Leyva et al , 2003. However, previous experiments used artiÞcial diets and substrates to measure budworm responses.…”
The fir sawyer beetle is a xylophagous species that develops outbreaks in boreal coniferous forests.Females deposit single eggs under the bark through slotted holes that they make by their mandibles.
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