Potential for outbreaks of leafrollers (lepidoptera: tortricidae) in California apple orchards using mating disruption for codling moth suppression

Kathleen R. Walker, Stephen C. Welter

Research output: Contribution to journalArticle

18 Scopus citations


Two species of leafrollers, Argyrotaenia citrana (Fernald) and Pandemis pyrusana Kearfott, represent serious obstacles to the implementation of mating disruption for control of codling moth in coastal California apple orchards. Larval and adult densities of A. citrana and P. pyrusana and subsequent fruit damage were compared under different codling moth control treatments. Leafroller larval counts and levels of fruit damage were significantly higher in most plots that were untreated or treated only with codling moth pheromone. Leafroller fruit damage levels in these plots were commonly between 10 and 15% at harvest. As summer larval counts were good predictors of fruit damage levels, larval sampling could be a useful tool for predicting leafroller outbreaks. Use of pheromone trapping for A. citrana to detect localized outbreaks within an orchard was not useful and failed to correlate with larval numbers, whereas adult monitoring for P. pyrusana appears more promising. Efforts to implement a codling moth mating-disruption program in California must include changes in strategies for monitoring and controlling leafroller species.

Original languageEnglish (US)
Pages (from-to)373-380
Number of pages8
JournalJournal of economic entomology
Issue number2
StatePublished - Jan 1 2001
Externally publishedYes



  • Argyrotaenia citrana
  • Leafrollers
  • Mating disruption
  • Pandemis pyrusana
  • Pheromones

ASJC Scopus subject areas

  • Ecology
  • Insect Science

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