Biological control potential of Apanteles aristoteliae (Hymenoptera: Braconidae) on populations of Argyrotaenia citrana (Lepidoptera: Tortricidae) in California apple orchards

Kathleen R Walker, Stephen C. Welter

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This study examined the potential role of native parasitoids in suppressing pest populations of Argyrotaenia citrana (Fernald) in coastal California apple orchards. An initial survey of larval and pupal parasitoids of A. citrana found that the most common parasitoids of A. citrana were the braconid Apanteles aristoteliae Viereck and the ichneumonid Exochus nigripalpis subobscurus Walsh that together parasitized 33% of the A. citrana larvae collected. To identify which parasitoid species caused most host mortality, parasitoid-induced mortality was examined more closely using sentinel A. citrana larvae. Small batches of both newly hatched and older (third and fourth instars) larvae were released and recaptured to collect emerging parasitoids. The results suggested that most parasitoid-induced mortality occurred in young larvae attacked by A. aristoteliae. To determine whether A. aristoteliae would be likely to suppress A. citrana populations in apples, further release-recapture experiments were conducted to assess the parasitoid's response to host aggregation. A. citrana larvae were released into small patches (individual clusters of fruit) and larger patches (an entire tree) at varying densities. In both the cluster and tree scale experiments the percentage of larvae parasitized by A. aristoteliae remained fairly constant at 40% regardless of the number of host larvae in a patch. These results indicate that A. aristoteliae attacks A. citrana in a density independent manner, which suggests that this parasitoid alone does not exert a strong regulatory effect on summer populations of A. citrana in apples.

Original languageEnglish (US)
Pages (from-to)1327-1334
Number of pages8
JournalEnvironmental Entomology
Volume33
Issue number5
StatePublished - Oct 2004

Fingerprint

Argyrotaenia citrana
Apanteles
Tortricidae
Braconidae
orchard
biological control
orchards
apples
Hymenoptera
Lepidoptera
parasitoid
larva
larvae
parasitoids
mortality
fruit
experiment

Keywords

  • Host aggregation
  • Parasitism

ASJC Scopus subject areas

  • Insect Science
  • Environmental Science(all)

Cite this

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title = "Biological control potential of Apanteles aristoteliae (Hymenoptera: Braconidae) on populations of Argyrotaenia citrana (Lepidoptera: Tortricidae) in California apple orchards",
abstract = "This study examined the potential role of native parasitoids in suppressing pest populations of Argyrotaenia citrana (Fernald) in coastal California apple orchards. An initial survey of larval and pupal parasitoids of A. citrana found that the most common parasitoids of A. citrana were the braconid Apanteles aristoteliae Viereck and the ichneumonid Exochus nigripalpis subobscurus Walsh that together parasitized 33{\%} of the A. citrana larvae collected. To identify which parasitoid species caused most host mortality, parasitoid-induced mortality was examined more closely using sentinel A. citrana larvae. Small batches of both newly hatched and older (third and fourth instars) larvae were released and recaptured to collect emerging parasitoids. The results suggested that most parasitoid-induced mortality occurred in young larvae attacked by A. aristoteliae. To determine whether A. aristoteliae would be likely to suppress A. citrana populations in apples, further release-recapture experiments were conducted to assess the parasitoid's response to host aggregation. A. citrana larvae were released into small patches (individual clusters of fruit) and larger patches (an entire tree) at varying densities. In both the cluster and tree scale experiments the percentage of larvae parasitized by A. aristoteliae remained fairly constant at 40{\%} regardless of the number of host larvae in a patch. These results indicate that A. aristoteliae attacks A. citrana in a density independent manner, which suggests that this parasitoid alone does not exert a strong regulatory effect on summer populations of A. citrana in apples.",
keywords = "Host aggregation, Parasitism",
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year = "2004",
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T1 - Biological control potential of Apanteles aristoteliae (Hymenoptera

T2 - Braconidae) on populations of Argyrotaenia citrana (Lepidoptera: Tortricidae) in California apple orchards

AU - Walker, Kathleen R

AU - Welter, Stephen C.

PY - 2004/10

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N2 - This study examined the potential role of native parasitoids in suppressing pest populations of Argyrotaenia citrana (Fernald) in coastal California apple orchards. An initial survey of larval and pupal parasitoids of A. citrana found that the most common parasitoids of A. citrana were the braconid Apanteles aristoteliae Viereck and the ichneumonid Exochus nigripalpis subobscurus Walsh that together parasitized 33% of the A. citrana larvae collected. To identify which parasitoid species caused most host mortality, parasitoid-induced mortality was examined more closely using sentinel A. citrana larvae. Small batches of both newly hatched and older (third and fourth instars) larvae were released and recaptured to collect emerging parasitoids. The results suggested that most parasitoid-induced mortality occurred in young larvae attacked by A. aristoteliae. To determine whether A. aristoteliae would be likely to suppress A. citrana populations in apples, further release-recapture experiments were conducted to assess the parasitoid's response to host aggregation. A. citrana larvae were released into small patches (individual clusters of fruit) and larger patches (an entire tree) at varying densities. In both the cluster and tree scale experiments the percentage of larvae parasitized by A. aristoteliae remained fairly constant at 40% regardless of the number of host larvae in a patch. These results indicate that A. aristoteliae attacks A. citrana in a density independent manner, which suggests that this parasitoid alone does not exert a strong regulatory effect on summer populations of A. citrana in apples.

AB - This study examined the potential role of native parasitoids in suppressing pest populations of Argyrotaenia citrana (Fernald) in coastal California apple orchards. An initial survey of larval and pupal parasitoids of A. citrana found that the most common parasitoids of A. citrana were the braconid Apanteles aristoteliae Viereck and the ichneumonid Exochus nigripalpis subobscurus Walsh that together parasitized 33% of the A. citrana larvae collected. To identify which parasitoid species caused most host mortality, parasitoid-induced mortality was examined more closely using sentinel A. citrana larvae. Small batches of both newly hatched and older (third and fourth instars) larvae were released and recaptured to collect emerging parasitoids. The results suggested that most parasitoid-induced mortality occurred in young larvae attacked by A. aristoteliae. To determine whether A. aristoteliae would be likely to suppress A. citrana populations in apples, further release-recapture experiments were conducted to assess the parasitoid's response to host aggregation. A. citrana larvae were released into small patches (individual clusters of fruit) and larger patches (an entire tree) at varying densities. In both the cluster and tree scale experiments the percentage of larvae parasitized by A. aristoteliae remained fairly constant at 40% regardless of the number of host larvae in a patch. These results indicate that A. aristoteliae attacks A. citrana in a density independent manner, which suggests that this parasitoid alone does not exert a strong regulatory effect on summer populations of A. citrana in apples.

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