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Universidade de Coimbra (2020)

Land-use effect on Chrysoperla carnea and related biocontrol against Prays oleae in olive groves

Alves, João Frederico Melo

Titre : Land-use effect on Chrysoperla carnea and related biocontrol against Prays oleae in olive groves

Efeitos de usos de solo na Chrysoperla carnea e no seu biocontrolo contra a Prays oleae em olivais

Auteur : Alves, João Frederico Melo

Université de soutenance : Universidade de Coimbra

Grade : Mestrado em Ecologia 2020

Résumé
In recent decades, olive growing has been subjected to intensive production methods with counterproductive effects, removing complexity and heterogeneity from these agricultural landscapes and neglecting public health, through the recurrent use of pesticides to control pests, contaminating the environment and the quality of such productions. In order to rethink the perniciousness inherent to these intensive productions, biological control techniques through the conservation and promotion of natural habitats and with a focus on promoting the necessary conditions for the development of natural enemies that naturally control pests have been properly examined. This work took place in twenty-five olive groves in the Beira Interior region, in the period between late-March to mid-July of 2019. Populations of the olive moth, Prays oleae and its natural enemy, Chrysoperla carnea were monitored every two weeks. The levels of olive fruit pest infestation were also quantified. In turn, the diversity of land-uses around the selected olive groves was classified and quantified after geospatial analysis within a radii of 500m. The results obtained corroborate the attraction of C. carnea to the olive moth, prove the potential of C. carnea as a biological control agent in olive groves, assert that the promotion of the diversity of land-uses has an eloquent effect in reducing the abundance of pest and confirm the olive grove as a primordial habitat for the development of P. oleae. The present disquisition aims at reconsidering the formation of agricultural ecosystems, enabling the assigning of greater value to olive productions and intends, to the detriment of the use of pesticides, to create sustainable alternatives that do not have harmful effects on the environment and public health.

Mots clés  : Chrysoperla carnea ; controlo biológico por conservação ; análise geoespacial ; paisagem ; Prays oleae ; Chrysoperla carnea ; conservation biological control ; geospatial analysis ; landscape ; Prays oleae

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Page publiée le 22 mars 2021