Effects of Host Diet on the Orientation, Development, and Subsequent Generations of the Gypsy Moth (Lepidoptera

Lymantriidae) Egg Parasitoid Ooencyrtus kuvanae (Hymenoptera: Encyrtidae)

Richard Hofstetter, Kenneth F. Raffa

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Female Ooencyrtus kuvanae (Howard) were attracted to odors from gypsy moth, Lymantria dispar (L.), egg masses in a 4-way olfactometer. Responses to egg mass odors varied with the difference of larval diet of the host. The number of gypsy moth generations on a particular larval diet also appeared to affect parasitoid orientation to the resulting egg masses. The plant species on which gypsy moth larvae fed affected characteristics of both the egg masses and the emerging wasps. Gypsy moth egg masses derived from plant-fed larvae had larger, but fewer, eggs than those derived from larvae fed artificial diet. The effects of host larval food on egg parasitoid emergence appeared in the 2nd generation, apparently because wasp developmental substrate affected their fecundity. O. kuvanae that developed in eggs derived from oak-fed gypsy moths produced more offspring than those that developed in eggs derived from tamarack-fed gypsy moths, regardless of subsequent ovipositional substrate. The offspring sex ratio was influenced by the ovipositional and parental substrates. The proportion of females was highest in larval treatments and egg mass sections that yielded the largest eggs. O. kuvanae generally parasitized more eggs in the section of the egg mass that was laid first by the gypsy moth.

Original languageEnglish (US)
Pages (from-to)1276-1282
Number of pages7
JournalEnvironmental Entomology
Volume26
Issue number6
StatePublished - Dec 1997
Externally publishedYes

Fingerprint

Ooencyrtus kuvanae
egg parasitoid
Encyrtidae
Lymantriidae
Lymantria dispar
moth
egg masses
Hymenoptera
Lepidoptera
diet
egg
odors
wasp
larva
substrate
odor
olfactometers
effect
larvae
artificial diets

Keywords

  • Egg parasitoid
  • Fecundity
  • Host location
  • Lymantria dispar
  • Ooencyrtus kuvanae
  • Sex ratio

ASJC Scopus subject areas

  • Insect Science
  • Environmental Science(all)

Cite this

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title = "Effects of Host Diet on the Orientation, Development, and Subsequent Generations of the Gypsy Moth (Lepidoptera: Lymantriidae) Egg Parasitoid Ooencyrtus kuvanae (Hymenoptera: Encyrtidae)",
abstract = "Female Ooencyrtus kuvanae (Howard) were attracted to odors from gypsy moth, Lymantria dispar (L.), egg masses in a 4-way olfactometer. Responses to egg mass odors varied with the difference of larval diet of the host. The number of gypsy moth generations on a particular larval diet also appeared to affect parasitoid orientation to the resulting egg masses. The plant species on which gypsy moth larvae fed affected characteristics of both the egg masses and the emerging wasps. Gypsy moth egg masses derived from plant-fed larvae had larger, but fewer, eggs than those derived from larvae fed artificial diet. The effects of host larval food on egg parasitoid emergence appeared in the 2nd generation, apparently because wasp developmental substrate affected their fecundity. O. kuvanae that developed in eggs derived from oak-fed gypsy moths produced more offspring than those that developed in eggs derived from tamarack-fed gypsy moths, regardless of subsequent ovipositional substrate. The offspring sex ratio was influenced by the ovipositional and parental substrates. The proportion of females was highest in larval treatments and egg mass sections that yielded the largest eggs. O. kuvanae generally parasitized more eggs in the section of the egg mass that was laid first by the gypsy moth.",
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AB - Female Ooencyrtus kuvanae (Howard) were attracted to odors from gypsy moth, Lymantria dispar (L.), egg masses in a 4-way olfactometer. Responses to egg mass odors varied with the difference of larval diet of the host. The number of gypsy moth generations on a particular larval diet also appeared to affect parasitoid orientation to the resulting egg masses. The plant species on which gypsy moth larvae fed affected characteristics of both the egg masses and the emerging wasps. Gypsy moth egg masses derived from plant-fed larvae had larger, but fewer, eggs than those derived from larvae fed artificial diet. The effects of host larval food on egg parasitoid emergence appeared in the 2nd generation, apparently because wasp developmental substrate affected their fecundity. O. kuvanae that developed in eggs derived from oak-fed gypsy moths produced more offspring than those that developed in eggs derived from tamarack-fed gypsy moths, regardless of subsequent ovipositional substrate. The offspring sex ratio was influenced by the ovipositional and parental substrates. The proportion of females was highest in larval treatments and egg mass sections that yielded the largest eggs. O. kuvanae generally parasitized more eggs in the section of the egg mass that was laid first by the gypsy moth.

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