Interaction between the aphid parasitoid Lysiphlebus testaceipes (Hymenoptera: Aphidiidae) and its hyperparasitoid Syrphophagus africanus (Hymenoptera: Encyrtidae)

Komla Kyky Ganyo, Agbeko Kodjo Tounou, Cyriaque Agboton, Elie Ayitondji Dannon, Barry Robert Pittendrigh, Manuele Tamò

Research output: Contribution to journalArticle

Abstract

The interactions between the cowpea aphid Aphis craccivora Koch, its parasitoid Lysiphlebus testaceipes Cresson and hyperparasitoid Syrphophagus africanus Gahan were assessed in the laboratory. Host age preference for hyperparasitism was evaluated using parasitized aphids of different ages (i.e. 1, 2, 3, 4, 5 and 6 days old and mixed ages). We studied the influence of the hyperparasitoid on the parasitism efficiency of L. testaceipes, the effect of host age on some biological parameters of S. africanus, and its hyperparasitism based on aggregated or isolated mummies. The presence of S. africanus significantly affected aphid parasitism by L. testaceipes (21.2-±-3.6 vs 36.6-±-4.5%). Except for 1-day-old hosts, S. africanus successfully parasitized hosts of all tested ages, with preference for newly formed mummies (39.16-±-3.31% parasitism in 5-day-old hosts). The development time of immature stages of the S. africanus progeny was significantly affected by host age. The sex ratio of the hyperparasitoid progeny was largely female biased and did not vary with host age. Syrphophagus africanus females from live parasitized aphids produced more offspring (36.55-±-6.28 vs 25.00-±-7.16) and lived longer (21.09-±-1.57 vs 10.88-±-2.31 days) than those from mummy hosts. Hyperparasitism rates were higher on aggregated mummies than on dispersed ones (36.00-±-2.86 vs 20.66-±-4.00%).

Original languageEnglish (US)
Pages (from-to)45-55
Number of pages11
JournalInternational Journal of Tropical Insect Science
Volume32
Issue number1
DOIs
StatePublished - Mar 1 2012

Keywords

  • Cowpea aphid Aphis craccivora
  • Lysiphlebus testaceipes
  • Syrphophagus africanus
  • hyperparasitism
  • interactions

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Insect Science

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