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<p><i>Psyttalia ponerophaga</i>, a parasitoid and prospective biological control agent of the olive fruit fly <i>Bactrocera oleae</i>, can be mass reared on a factitious host, <i>Ceratitis capitata</i>. The present study was designed to evaluate the effects of mass rearing on <i>C. capitata</i> for 76 generations on its efficacy against its target host <i>B. oleae</i>. Several biological parameters of parasitoids reared on <i>C. capitata</i> were compared to individuals directly collected in the field. In addition, host use tests were conducted under no-choice and choice conditions with two non-target Tephritidae species: the black cherry fruit fly <i>Rhagoletis fausta</i> and the Cape-ivy gall fly <i>Parafreutreta regalis</i>. Results showed that the wild population performed better against <i>B. oleae</i>: parasitism rate and reproductive output per host available were higher, and sex ratio of progeny was more female biased compared to the population reared on the factitious host. Host use tests revealed that the laboratory-reared population and the wild population were able to successfully parasitize the two non-target species tested. Genetic analyses of dead puparia of the non-target species also revealed occurrences of failed parasitism attempts for the two parasitoid populations. In conclusion, rearing on a factitious host and/or mass-rearing itself significantly decreased the parasitoid’s efficacy against <i>B. oleae</i>, which may have detrimental consequences for its success as a biocontrol agent under realistic field conditions.</p>

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Effects of rearing on a factitious host on the efficacy and host use of Psyttalia ponerophaga, a parasitoid of the olive fruit fly Bactrocera oleae

  • 期刊论文

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  • 发表日期：

    2026年5月14日

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  • Gaylord A. Desurmont,
  • Xingeng Wang,
  • Elven Kerdellant,
  • Marie-Claude Bon,
  • Arnaud Blanchet,
  • Fatiha Guermache,
  • Mélanie Tannières,
  • Christopher J. Borkent

摘要

Psyttalia ponerophaga, a parasitoid and prospective biological control agent of the olive fruit fly Bactrocera oleae, can be mass reared on a factitious host, Ceratitis capitata. The present study was designed to evaluate the effects of mass rearing on C. capitata for 76 generations on its efficacy against its target host B. oleae. Several biological parameters of parasitoids reared on C. capitata were compared to individuals directly collected in the field. In addition, host use tests were conducted under no-choice and choice conditions with two non-target Tephritidae species: the black cherry fruit fly Rhagoletis fausta and the Cape-ivy gall fly Parafreutreta regalis. Results showed that the wild population performed better against B. oleae: parasitism rate and reproductive output per host available were higher, and sex ratio of progeny was more female biased compared to the population reared on the factitious host. Host use tests revealed that the laboratory-reared population and the wild population were able to successfully parasitize the two non-target species tested. Genetic analyses of dead puparia of the non-target species also revealed occurrences of failed parasitism attempts for the two parasitoid populations. In conclusion, rearing on a factitious host and/or mass-rearing itself significantly decreased the parasitoid’s efficacy against B. oleae, which may have detrimental consequences for its success as a biocontrol agent under realistic field conditions.