Larval dispersal from potential hosts within a population of a generalist herbivore, Choristoneura rosaceana

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Abstract

The dispersal behavior of Choristoneura rosaceana (Harris) (Lepidoptera: Tortricidae) first instar larvae was studied in the laboratory. The objectives were to investigate the proximal factors influencing larval dispersal and to establish whether a correspondence exists between larval host acceptance and performance. A dispersal bioassay was validated by demonstrating the presence of a positive correlation between larval host acceptance in the laboratory and in the field. Larval age and family origin, as well as host species attributes were shown to influence larval dispersal rates. Seasonal changes in host plants slightly changed the rank order of larval host acceptance. Leaf texture and the availability of refuges on host plants seemed to be important factors influencing the rate of larval dispersal. Plant odor appeared to be used by the larvae to locate leaves. Nitrogen content of plant species corresponded to larval dispersal rates, but the cause of this association is unclear. Larval dispersal did not match host suitabilities as measured by larval performance. The relationship between host preference and suitability in the obliquebanded leafroller is discussed in an ecological and evolutionary perspective.

Original languageEnglish (US)
Pages (from-to)11-19
Number of pages9
JournalEntomologia Experimentalis et Applicata
Volume65
Issue number1
DOIs
StatePublished - Oct 1992
Externally publishedYes

Fingerprint

Choristoneura rosaceana
generalist
herbivore
host preferences
herbivores
host plants
dispersal behavior
larvae
Tortricidae
host plant
nitrogen content
leaves
instars
bioassays
larva
texture
Lepidoptera
host preference
odors
refuge

Keywords

  • Choristoneura rosaceana
  • host preference
  • host suitability
  • larval dispersal
  • Tortricidae

ASJC Scopus subject areas

  • Insect Science

Cite this

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title = "Larval dispersal from potential hosts within a population of a generalist herbivore, Choristoneura rosaceana",
abstract = "The dispersal behavior of Choristoneura rosaceana (Harris) (Lepidoptera: Tortricidae) first instar larvae was studied in the laboratory. The objectives were to investigate the proximal factors influencing larval dispersal and to establish whether a correspondence exists between larval host acceptance and performance. A dispersal bioassay was validated by demonstrating the presence of a positive correlation between larval host acceptance in the laboratory and in the field. Larval age and family origin, as well as host species attributes were shown to influence larval dispersal rates. Seasonal changes in host plants slightly changed the rank order of larval host acceptance. Leaf texture and the availability of refuges on host plants seemed to be important factors influencing the rate of larval dispersal. Plant odor appeared to be used by the larvae to locate leaves. Nitrogen content of plant species corresponded to larval dispersal rates, but the cause of this association is unclear. Larval dispersal did not match host suitabilities as measured by larval performance. The relationship between host preference and suitability in the obliquebanded leafroller is discussed in an ecological and evolutionary perspective.",
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