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Nuove prospettive di previsione e di controllo delle infestazioni e del danno di Lymantria dispar (L.) in Sardegna

Mannu, Roberto (2016) Nuove prospettive di previsione e di controllo delle infestazioni e del danno di Lymantria dispar (L.) in Sardegna. Doctoral Thesis.

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Abstract

In Sardinia (Italy) gypsy moth population density has been regularly evaluated through a monitoring network over thirty years based on egg masses counting at permanent sites. This activity allows to identify annually areas with the highest infestation density in order to define sites to be subjected to phytosanitary treatments.
To give an indication on the potential use of different microbiological products two years of efficacy trials with different Bacillus thuringiensis serovar kurstaki formulations were carried out in period 2012-2013. Tested formulations proved to be as effective as the reference products Foray 48B and Delfin in controlling L. dispar populations.
Historical series data on gypsy moth over-year-density were analyzed following two different study approaches. The first was based on a generalized linear model adopted to evaluate the statistical significance of the relationship between percentage of occupied sites and presence of damage. The results confirmed the validity of this method for an easier identification of forest areas exposed to damage in progradiation phase. In the second case, the use of incidence function model and other statistical approaches were investigated. Although the complexity in modelling L. dispar dynamics, results were promising for their use in defining the specific metapopulation dynamics pattern at forest district level.

Item Type:Doctoral Thesis
ID Code:11072
Contributors:Luciano, Pietro
Publisher:Universita' degli studi di Sassari
Uncontrolled Keywords:Gypsy moth, Bacillus thuringiensis, pest monitoring program, metapopulation dynamics, incidence function model, Sardinia
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/11 Entomologia generale e applicata
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Cicli, scuole e corsi:Ciclo 28 > Scienze e biotecnologie dei sistemi agrari e forestali e delle produzioni alimentari > Monitoraggio e controllo degli ecosistemi forestali in ambiente mediterraneo
Deposited On:15 Jun 2016 10:51

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