Role of plant volatiles in host location by the specialist parasitoid Microplitis croceipes cresson (Braconidae: Hymenoptera)

Philip J. McCall, Ted C.J. Turlings, W. Joe Lewis, James Homer Tumlinson, III

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

A study was conducted to determine the primary source of volatile cues within the plant-host complex used by hostseeking freeflying female Microplitis cro-ceipes Cresson in flight tunnel bioassays. In single-source and two-choice tests, using wasps given an oviposition experience on either cotton (Gossypium hirsutum)or cowpea (Vigna unguiculata)seedlings damaged by corn earworm (CEW; Helicoverpa zea Boddie), the damaged seedlings were significantly more attractive than the CEW frass, which was in turn more attractive than the larvae themselves. In a series of two-choice wind-tunnel tests, the discriminatory ability of the wasps was examined, following various oviposition experiences. Significantly more wasps flew to plants with "old" damage than to plants with "fresh" damage, regardless of whether they had experience on fresh or old damage. In a comparison of plant species, wasps with only one experience on either hostdamaged cotton or host-damaged cowpea were unable to distinguish between them, and showed no preference for either plant, whereas wasps with multiple experiences on a particular plant preferentially flew to that plant in the choice test. In comparing hosts with nonhosts, wasps successfully learned to distinguish CEW from beet armyworm (BAW; Spodoptera exigua)on cotton but were unable to distinguish CEW from either BAW or cabbage looper (Trichoplusia ni)on cowpea. The results show the important role played by plant volatiles in the location of hosts by M. croceipes and indicate the wasps' limitations in discriminating among the various odors. The ecological advantages and disadvantages of this behavior are discussed.

Original languageEnglish (US)
Pages (from-to)625-639
Number of pages15
JournalJournal of Insect Behavior
Volume6
Issue number5
DOIs
StatePublished - Sep 1 1993

Fingerprint

Microplitis croceipes
host location
Braconidae
wasp
parasitoid
Hymenoptera
cowpeas
cotton
Trichoplusia ni
Spodoptera exigua
Helicoverpa zea
oviposition
damage
Microplitis
seedling
frass
seedlings
wind tunnels
testing
Vigna unguiculata

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Insect Science

Cite this

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title = "Role of plant volatiles in host location by the specialist parasitoid Microplitis croceipes cresson (Braconidae: Hymenoptera)",
abstract = "A study was conducted to determine the primary source of volatile cues within the plant-host complex used by hostseeking freeflying female Microplitis cro-ceipes Cresson in flight tunnel bioassays. In single-source and two-choice tests, using wasps given an oviposition experience on either cotton (Gossypium hirsutum)or cowpea (Vigna unguiculata)seedlings damaged by corn earworm (CEW; Helicoverpa zea Boddie), the damaged seedlings were significantly more attractive than the CEW frass, which was in turn more attractive than the larvae themselves. In a series of two-choice wind-tunnel tests, the discriminatory ability of the wasps was examined, following various oviposition experiences. Significantly more wasps flew to plants with {"}old{"} damage than to plants with {"}fresh{"} damage, regardless of whether they had experience on fresh or old damage. In a comparison of plant species, wasps with only one experience on either hostdamaged cotton or host-damaged cowpea were unable to distinguish between them, and showed no preference for either plant, whereas wasps with multiple experiences on a particular plant preferentially flew to that plant in the choice test. In comparing hosts with nonhosts, wasps successfully learned to distinguish CEW from beet armyworm (BAW; Spodoptera exigua)on cotton but were unable to distinguish CEW from either BAW or cabbage looper (Trichoplusia ni)on cowpea. The results show the important role played by plant volatiles in the location of hosts by M. croceipes and indicate the wasps' limitations in discriminating among the various odors. The ecological advantages and disadvantages of this behavior are discussed.",
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Role of plant volatiles in host location by the specialist parasitoid Microplitis croceipes cresson (Braconidae : Hymenoptera). / McCall, Philip J.; Turlings, Ted C.J.; Lewis, W. Joe; Tumlinson, III, James Homer.

In: Journal of Insect Behavior, Vol. 6, No. 5, 01.09.1993, p. 625-639.

Research output: Contribution to journalArticle

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