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Biocontrol of the apple sawfly,Hoplocampa testudinea, with entomogenous nematodes

Entomophaga volume 37, pages 575–582 (1992)Cite this article

Abstract

Four types of experiments were conducted to assess the pathogenicity of entomogenous nematodes against the apple sawfly,Hoplocampa testudinea Klug (Hymenoptera: Tenthredinidae). In Petri dish,Steinernema carpocapsae (Weiser) DD 136 strain,S. carpocapsae All strain,S. feltiae (Filipjev) andHeterorhabditis bacteriophora Poinar caused 100% larval mortality 72 h after the treatments. In semi-field conditions under dwarf apple trees, a single treatment with either 40 or 80S. carpocapsae All strain/cm2 caused significant (>80%) larval mortality. No significant increase in mortality was obtained with a second application. In 1990, late treatment with 80S. carpocapsae All strain/cm2 caused significant (39.1%) pupal mortality. In 50×50 cm quadrats under dwarf apple trees, treatment with 40 and 80S. carpocapsae All strain/cm2 were done in spring 1989. In spring 1990, respectively 22 and 25 apple sawfly adults emerged from quadrats treated with 40 and 80S. carpocapsae All strain/cm2, whereas 78 adults emerged from untreated quadrats. In a foliar application experiment, a single treatment withS. carpocapsae All strain significantly reduced the percent of fruit showing secondary damage. The possibility of using entomogenous nematodes as part of an integrated pest management in apple orchards is discussed, with particular reference to the integration of programs aimed at managing plum curculio,Conotrachelus nenuphar (Herbst) (Coleoptera: Curculionidae) populations.

Résumé

On a effectué quatre types d'expériences pour évaluer la pathogénicité de nématodes entomogènes contre l'hoplocampe des pommes,Hoplocampa testudinea Klug (Hymenoptera:Tenthredinidae). En boîte de Petri,Steinernema carpocapsae (Weiser) souche DD 136,S. carpocapsae souche All,S. feltiae (Filipjev) etHeterorhabditis bacteriophora Poinar ont causé 100% de mortalité larvaire 72 h aprè le traitement. En conditions de plein champs sous des pommiers nains, un seul traitement avec 40 ou 80S. carpocapsae souche All/cm2 a causé une mortalité significative (> 80%). Un second traitement avec des nématodes n'a pas amené une augmentation significative de la mortalité. En 1990, des traitements tardifs avec 40S. carpocapsae souche All/cm2 dans des quadrats de 50×50 cm disposés sous des pommiers nains ont été effectués au printemps 1989. Au printemps 1990, respectivement 22 et 25 hoplocampes adultes émergeaient des quadrats traités avec 40 et 80S. carpocapsae souche All/cm2, tandis que 78 adultes ont émergé des quadrats traités avec de l'eau. Pulvérisé sur le feuillage, un seul traitement avec la souche All deS. carpocapsae a significativement réduit le pourcentage de fruits ayant des dommages secondaires. On discute de la possibilité d'utiliser des nématodes entomogènes dans le cadre d'un programme de lutte intégrée, avec une attention particulière à l'intégration avec le programme de lutte contre les populations du charançon de la prune,Conotrachelus nenuphar Herbst (Coleoptera:Curculionidae).

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  1. Station de recherches, Agriculture, Canada, 430, boul. Gouin, J3B 3E6, Saint-Jean-sur-Richelieu, Qué, Canada

    C. Vincent & G. Bélair

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  1. C. Vincent
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  2. G. Bélair
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Vincent, C., Bélair, G. Biocontrol of the apple sawfly,Hoplocampa testudinea, with entomogenous nematodes. Entomophaga 37, 575–582 (1992). https://doi.org/10.1007/BF02372327

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  • DOI: https://doi.org/10.1007/BF02372327

Key-Words

  • Apple sawfly
  • Hoplocampa testudinea
  • biological control
  • nematodes
  • Steinernema
  • Heterorhabditis

Mots Clés

  • Hoplocampe de la pomme
  • Hoplocampa testudinea
  • lutte biologique
  • nématodes
  • Steinernema
  • Heterorhabditis