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Identifier 000446837
Title Βελτίωση χρήσης του αρπακτικού Amblyseius swirskii (Phytoseiidae) ως παράγοντα βιολογικού ελέγχου
Alternative Title Improving the use of predator Amblyseius swirskii (Phytoseiidae) as a biological control agent
Author Καρακώστα, Ευαγγελία Χ.
Thesis advisor Βόντας, Ιωάννης
Reviewer Καλαντίδης, Κρίτων
Τσαγκαράκου, Αναστασία
Abstract In a period, which the agriculture is still characterized by the use of pesticides, biological control has established, in the form of the release of natural enemies. The integrated pest management is the use of beneficial organisms in combination with chemical control and their between compatibility is required. The predatory mites of Phytoseiidae family are commercially available and recently established as biological control agents. Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae) is one of the predators used for biological control of whiteflies and thrips in greenhouse and cover crops, except for the tomato crop on which it cannot establish. The purpose of this study is to investigate the predator characterisitcs of Amblyseius swirskii to improve its use as a biological control agent and to investigate the tomato plant characteristics which affect it. The resistance of a commercial population and a wild population to two active insecticides, spinosad and abamectin, was assessed. Then the presence of potential mutations associated with resistance of abamectin was investigated. Μoreover, we compared the predation rate and the oviposition rate of the two populations, providing as prey, eggs of Bemisia tabaci. Furthermore, the genetic diversity of the two populations was studied, using a mitochondrial marker COI. Additionally, reproductive compatibility between the two populations was investigated by cross-breeding and the presence of endosymbiotic bacteria Wolbachia, Rickettsia, Cardinium, Spiroplasma, Hamiltonella, Arsenophonus. The wild population was detected to be more resistant to the two active substances, compared to the commercial population. In addition, none of the known mutations in the GluCl gene sequence were found in the wild population. A higher rate of predation was observed in the wild population. The mitochondrial marker COI showed low genetic variability in the two populations. Reproductive compatibility and absence of endosymbiotic bacteria were identified between the two populations. An additional purpose of this research is to investigate the installation of A. swirskii predator on tomato plants. For this reason, the dispersal and the distance that the mite traversed on the stem of the plant were checked in two commercial varieties of tomato, in the presence and absence of the beneficial endophytic strain Fusarium Solani - K (FSK). Secondly, the density of type I, III and type VI hairs was estimated. It was found that the dispersal and the distance traversed by the mite, is affected by the tomato variety, but not by the beneficial endophytic strain Fusarium Solani - K (FSK). Moreover, it was found that the density of type VI glandular hairs differs between the tomato varieties and affects the dispersal of A. swirskii mite. In conclusion, to further improve the efficiency of the commercial population Amblyseius swirskii in terms of resistance and predation rate, it is proposed the genetic enrichment of the commercial population with wild populations which have desirable characteristics. Furthermore, tomato varieties can be investigated for the density of their glandular hairs, for the detection of varieties with favorable characteristics for the phytoseiid predators.
Language Greek
Subject Abamectin
Fusarium Solani – Κ
Resistant
Spinosad
Tomato
Trichomes
Ανθεκτικότητα
Τομάτα
Τριχίδια
Issue date 2022-03-28
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/f/9/b/metadata-dlib-1647863207-649742-23512.tkl Bookmark and Share
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