Feeding and oviposition behavior do not explain Douglas-fir resistance to defoliation by the western spruce budworm (Lepidoptera

Tortricidae)

Barbara L. Palermo, Karen M. Clancy, George W Koch

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

There is phenotypic variation among individual trees of interior Douglas-fir (Pseudotsuga menziesii variety glauca [Beissn.] Franco) in their resistance to defoliation by the western spruce budworm (Choristoneura occidentalis Freeman). We are evaluating the factors associated with this resistance using grafted clones derived from parent trees that are resistant versus susceptible to budworm defoliation in the field. We tested the potential role of feeding and oviposition behavior in determining the resistance using C. occidentalis larvae and moths from our nondiapausing laboratory colony, and foliage from grafted ramets (6-8-yr-old potted trees) of resistant and susceptible Douglas-firs. In the larval feeding bioassay, fifth instars were offered a choice between branches from susceptible and resistant ramets. There was no difference in the proportion of current-year buds and shoots consumed, indicating that larvae do not discriminate between foliage from susceptible and resistant trees. When offered a choice in cage arenas made of metal screen, female moths laid significantly more of their egg masses on susceptible foliage (54%), compared with resistant foliage (34%), artificial foliage (6%), or nonfoliage material (6%). Conversely, no oviposition preference was detected when resistant versus susceptible Douglas-fir twigs were the only substrates available in paper bag arenas. Western spruce budworm feeding and oviposition behavior do not appear to be important factors associated with Douglas-fir resistance.

Original languageEnglish (US)
Pages (from-to)626-632
Number of pages7
JournalEnvironmental Entomology
Volume32
Issue number3
StatePublished - Jun 2003

Fingerprint

Choristoneura occidentalis
Tortricidae
defoliation
Pseudotsuga menziesii
oviposition
foliage
Lepidoptera
leaves
moth
moths
behavioral resistance
larva
larvae
individual variation
bud
phenotypic variation
egg masses
bags
bioassay
clone

Keywords

  • Choristoneura occidentalis
  • Douglas-fir
  • Feeding behavior
  • Oviposition behavior
  • Resistance

ASJC Scopus subject areas

  • Insect Science
  • Environmental Science(all)

Cite this

Feeding and oviposition behavior do not explain Douglas-fir resistance to defoliation by the western spruce budworm (Lepidoptera : Tortricidae). / Palermo, Barbara L.; Clancy, Karen M.; Koch, George W.

In: Environmental Entomology, Vol. 32, No. 3, 06.2003, p. 626-632.

Research output: Contribution to journalArticle

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