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Habitat Modification Alters Food Web Interactions with Focus on Biological Control of Aphids in Apple Orchards

Author

Listed:
  • Ammar Alhmedi

    (Research Station for Fruit (Pcfruit Npo), 3800 Sint-Truiden, Belgium)

  • Tim Belien

    (Research Station for Fruit (Pcfruit Npo), 3800 Sint-Truiden, Belgium)

  • Dany Bylemans

    (Research Station for Fruit (Pcfruit Npo), 3800 Sint-Truiden, Belgium
    Department of Biosystems, KU Leuven, 3001 Leuven, Belgium)

Abstract

To date, direct interactions between pests and natural enemies are often considered in biocontrol programs. Recently there has been an increase of evidence for the importance of third-party mediated indirect interactions in determining the population dynamics of insects. Predicting the strength of such interactions remains a central challenge in biocontrol assessments. Here, two field experiments were performed in two years to investigate to which extent Dysaphis plantaginea Passerini, Aphis pomi De Geer, and Myzus cerasi Fabricius might indirectly interact through shared natural enemies and ants. We first studied the population dynamics of target insects in isolated orchards of apples and cherries. Secondly, we investigated how the spatial coexistence of aphid-infested cherries can indirectly affect the population dynamics of apple aphids via natural enemies and ants. In the first experiment, nine parasitoid species were recorded on apple and cherry aphids, among them were three species in common. Six predatory families were found on cherry and apple aphids, while only one ant species, Lasius niger L., was found associating with these aphids. In the second experiment, temporal variation in the natural enemy-mediated apparent competition between M. cerasi and apple aphids was found. The cherry aphid is likely to be an important source of natural enemies that attack apple aphids early in the season. Significantly reduced numbers of ants associating with apple aphids in the intercropping habitat were found. Our results emphasize the importance of considering indirect interactions in the designing of pest management strategies.

Suggested Citation

  • Ammar Alhmedi & Tim Belien & Dany Bylemans, 2023. "Habitat Modification Alters Food Web Interactions with Focus on Biological Control of Aphids in Apple Orchards," Sustainability, MDPI, vol. 15(7), pages 1-13, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:7:p:5978-:d:1111449
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    References listed on IDEAS

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    1. Rebecca J. Morris & Owen T. Lewis & H. Charles J. Godfray, 2004. "Experimental evidence for apparent competition in a tropical forest food web," Nature, Nature, vol. 428(6980), pages 310-313, March.
    2. Ugo Bastolla & Miguel A. Fortuna & Alberto Pascual-García & Antonio Ferrera & Bartolo Luque & Jordi Bascompte, 2009. "The architecture of mutualistic networks minimizes competition and increases biodiversity," Nature, Nature, vol. 458(7241), pages 1018-1020, April.
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