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Entomophaga

, Volume 35, Issue 4, pp 499–507 | Cite as

Synomone-mediated interactions between the parasitoidDiaeretiella rapae andBrevicoryne brassicae under field conditions

  • M. Titayavan
  • M. A. Altieri
Article

Abstract

An interaction apparently mediated by synomones (Nordlundet al., 1981) betweenDiaeretiella rapae (M'Intosh), a primary parasitoid and the cabbage aphid,Brevicoryne brassicae (L.), was investigated under field conditions. Direct application of an allylisothiocyanate emulsion at a rate of 0.25 ml per broccoli plant consistently gave higher aphid parasitization rates and/or number of wasps per plant than those observed on plants treated with 0.25 ml of water or with 0.25 ml of wild mustard extract. These results suggest the existence of a synomonemediated interaction between the species involved, indicating potential avenues to enhance field parasitization rates through manipulation of the chemical environment of cole cropping systems.

Key-Words

Diaeretiella rapae cabbage aphid biological control allelochemic synomone 

Résumé

Une interaction transmise apparemment par synomones entreDiaeretiella rapae, parasitoïde primaire et le puceron du Chou,Brevicoryne brassicae a été étudiée dans les conditions naturelles. L'application directe d'une émulsion d'allylisothiocyanate à la dose de 0,25 ml par plant de Chou donnait des taux de parasitisme et/ou un nombre d'hyménoptères plus élevés que ceux observés sur plants traités avec 0,25 ml d'eau ou avec 0,25 ml d'extrait de moutard sauvage. Ces résultats suggèrent l'existence d'une interaction transmise par synomone entre les espèces impliquées indiquant des chemins potentiels pour accroître les taux de parasitisme naturels par la manipulation de l'environnement chimique des cultures de Colza.

Mots Clés

Diaeretiella rapae puceron du chou lutte biologique allélochimique synomone 

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Copyright information

© Lavoisier Abonnements 1990

Authors and Affiliations

  • M. Titayavan
    • 1
  • M. A. Altieri
    • 2
  1. 1.The Multiple Cropping CenterChiang Mai UniversityChiang MaiThailand
  2. 2.Division of Biological ControlUniversity of CaliforniaBerkeleyU.S.A.

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