Pest species diversity enhances control of spider mites and whiteflies by a generalist phytoseiid predator
| Autor: | Arne Janssen, Renata van Holstein-Saj, Roos van Maanen, Gerben J. Messelink, Maurice W. Sabelis |
|---|---|
| Přispěvatelé: | Population Biology (IBED, FNWI) |
| Jazyk: | angličtina |
| Předmět: |
biological-control agents
western flower thrips Biological pest control Zoology Whitefly Wageningen UR Glastuinbouw alternative prey Spider mite Botany Tetranychus urticae biodiversity Spider biology Thrips Wageningen UR Greenhouse Horticulture carabid beetles food mediated apparent competition Greenhouse whitefly biology.organism_classification Western flower thrips plant-resistance Insect Science diet Agronomy and Crop Science intraguild predation |
| Zdroj: | BioControl, 55(3), 387-398. Springer BioControl 55 (2010) 3 BioControl, 55(3), 387-398 |
| ISSN: | 1386-6141 1573-8248 |
| DOI: | 10.1007/s10526-009-9258-1 |
| Popis: | To test the hypothesis that pest species diversity enhances biological pest control with generalist predators, we studied the dynamics of three major pest species on greenhouse cucumber: Western flower thrips, Frankliniella occidentalis (Pergande), greenhouse whitefly, Trialeurodes vaporariorum (Westwood), and two-spotted spider mites, Tetranychus urticae Koch in combination with the predator species Amblyseius swirskii Athias-Henriot. When spider mites infested plants prior to predator release, predatory mites were not capable of controlling spider mite populations in the absence of other pest species. A laboratory experiment showed that predators were hindered by the webbing of spider mites. In a greenhouse experiment, spider mite leaf damage was lower in the presence of thrips and predators than in the presence of whiteflies and predators, but damage was lowest in the presence of thrips, whiteflies and predators. Whitefly control was also improved in the presence of thrips. The lower levels of spider mite leaf damage probably resulted from (1) a strong numerical response of the predator (up to 50 times higher densities) when a second and third pest species were present in addition to spider mites, and (2) from A. swirskii attacking mobile spider mite stages outside or near the edges of the spider mite webbing. Interactions of spider mites with thrips and whiteflies might also result in suppression of spider mites. However, when predators were released prior to spider mite infestations in the absence of other pest species, but with pollen as food for the predators, we found increased suppression of spider mites with increased numbers of predators released, confirming the role of predators in spider mite control. Thus, our study provides evidence that diversity of pest species can enhance biological control through increased predator densities. |
| Databáze: | OpenAIRE |
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