Disturbance and forest health in Oregon and Washington / technical coordinators: Sally Campbell, Leon Liegel ; editor: Martha H. Brookes.

Brookes, Martha H.; Campbell, Sally; Liegel, Leon H.

doi:10.5962/bhl.title.18429

Cited by 1 publication

(2 citation statements)

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“…The first instars disperse from the egg mass and spin hibernaculae in sheltered locations on host trees, after which they moult into second instars without feeding and overwinter in their hibernaculae. Upon emergence in early May, a majority of these second instars passively disperses on silken threads and, upon landing on a suitable food source, begins feeding (Brookes et al, 1987); suitable food sources include current-year buds and needles of fir (Abies spp. ), Douglas-fir (Pseudotsuga menziesii [Mirb.]…”

Section: Life Historymentioning

confidence: 99%

“…Upon emergence of a female, one male moth was placed inside the creamer cup. Adding a male moth as soon as the female moth emerged from the pupa ensured that mating could occur within 24 h of female emergence, thereby maximizing potential fecundity (Lyon et al, 1972;Brookes et al, 1987). Upon pairing one male and one female moth, they were placed in a mating bag and different types of foliage were added for oviposition substrate.…”

Section: Egg Retention Experimentsmentioning

confidence: 99%

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Oviposition strategies employed by the western spruce budworm: tests of predictions from the phylogenetic constraints hypothesis

Leyva¹,

Clancy²,

Price³

2003

Agri and Forest Entomology

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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 test whether female budworms use oviposition strategies to select the sites where they lay their egg masses. Our experiments were designed to make direct comparisons between latent and eruptive insect herbivores with respect to two oviposition behaviours: egg retention and avoidance of conspecifics. This type of research has not previously been conducted on any eruptive forest Lepidopteran. 4 Female budworms retained eggs instead of laying them on less preferred hosts in two of three experiments, but the percentage of eggs they retained was significantly less compared to latent insect herbivores. 5 In addition, female budworms actively avoided oviposition in areas with the highest density of conspecific egg masses, but they laid egg masses in all the other locations provided. This contrasts with the pattern seen in latent insect herbivores, which consistently avoid laying their eggs near any sites already used by conspecifics. 6 Our research indicates that there are extreme differences between latent and eruptive insect herbivores with respect to egg retention and avoidance of conspecifics, thus supporting the Phylogenetic Constraints Hypothesis.

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Section: Life Historymentioning

confidence: 99%

Section: Egg Retention Experimentsmentioning

confidence: 99%