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Title: Investigation of mating disruption methods and agronomic techniques as an IPM contribution to control the grapevine moth Lobesia botrana (Denis and Schiffermuller) (Lepidoptera: Tortricidae) in Northern Greece
Author: Vartholomaiou, Aikaterini N.
ISNI:       0000 0001 3542 9489
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 2006
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Lobesia botrana (Denis and Schiffermuller) (Lepidoptera:Tortricidae) is the most serious pest of grape cultivation in Greece. To help develop an integrated pest management (IPM) strategy for L. botrana, research on mating disruption was undertaken, with the following specific objectives: to evaluate the potential role of' mating disruption approaches for the control of L. botrana in commercial vineyards in Northern Greece using the Quant Lb-R pheromone dispenser? (at high and lowmedium pest population densities) and the ExoSex system (at high pest population densities); to evaluate whether these approaches could be integrated, to useful effect, with selective chemical control strategies and non-chemical control strategies, including Bacillus thuringiensis (Bf); to provide data that could be used in assembling a data package for the future registration of com.tllercial mating disruption products in Greece. The results revealed that the efficacy of mating disruption using Quant ~b-R dispensers differed with different pest densities. The method worked most effectively where the initial pest pressure was low-medium. However, in a commercial vineyard where the pest population was high, a combination of the mating disruption method, with the insect growth regulator; f1ufenoxuron, or Bt, was necessary to provide adequate pest control. The efficacy of the ExoSex method was examined at high pest population densities. The results revealed that treatment with ExoSex dispensers together with f1ufenoxuron, provided effective control and performed better than ExoSex alone or f1ufenoxuron alone. A survey of predatory mites, and an evaluation of the effects of crop protection practices on their populations were also carried out. Amongst the predatory mites of the family Phytoseiidae that were recorded on the experimental plots, Typhlodromus Perbibus Wainstein & Arutunjian was by far the most frequently-found species. The results of a field trial indicated that f1ufenoxuron w~s not directly toxic to T. perbibus at recommended rates. In contrast, the acaricide, propargite, had significantly adverse effects on T. perbibus numbers within 24 hours of application. A field experiment was also undertaken to evaluate the effect of vine cultivation practices (levels of nitrogen application; leaf and shoot pruning; growth regulators) on L. botrana incidence. There were highly significant differences recorded amongst the levels of nitrogen applied, amongst the types of pruning, and amongst the growth regulator treatments on L. botrana infestation levels. The contribution that cultural techniques could make to the management of L. botrana populations is discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available